69 Herculis: Difference between revisions
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{{Short description|Star in the constellation Hercules}} |
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{{about-distinguish2|e Herculis|[[Epsilon Herculis|ε Herculis]]}} |
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{{about-distinguish2|e Herculis|[[Epsilon Herculis|ε (epsilon) Herculis]]}} |
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{{starbox short |
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{{Starbox begin}} |
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|constell= [[Hercules (constellation)|Hercules]] |
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{{Starbox observe |
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|name= 69 Herculis |
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| epoch = J2000 |
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|type= A2V<ref name=SIMBAD>SIMBAD, [http://simbak.cfa.harvard.edu/simbad/sim-basic?Ident=69+Herculis&submit=SIMBAD+search e Herculis] (accessed 23 September 2012)</ref> |
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| constell = [[Hercules (constellation)|Hercules]] |
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|ra= {{RA|17|17|40.25427}}<ref name=SIMBAD/> |
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| |
| ra = {{RA|17|17|40.25427}}<ref name=vanLeeuwen2007/> |
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| dec = {{DEC|+37|17|29.3995}}<ref name=vanLeeuwen2007/> |
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|names={{odlist|B=e Her|BD=+37° 2864|HD=156729|HIP=84606|HR=6436|SAO=65921}} |
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| appmag_v = {{nowrap|4.63 (4.66 + 8.68)}}<ref name=Eggleton2008/> |
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}} |
}} |
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{{Starbox character |
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'''69 Herculis''' ('''69 Her''') is a [[star]] in the [[constellation]] [[Hercules (constellation)|Hercules]]. Its [[apparent magnitude]] is 4.62. |
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| type = main sequence |
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| class = A2V<ref name=Cowley1969/> |
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| b-v = {{Val|0.043|0.003}}<ref name=Anderson2012/> |
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| u-b = |
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| variable = |
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}} |
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{{Starbox astrometry |
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| radial_v = {{Val|−9.90|1.78}}<ref name=deBruijne2012/> |
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| prop_mo_ra = −43.05<ref name=vanLeeuwen2007/> |
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| prop_mo_dec = +64.36<ref name=vanLeeuwen2007/> |
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| parallax = 18.59 |
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| p_error = 0.33 |
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| parallax_footnote = <ref name=vanLeeuwen2007/> |
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| absmag_v = 0.99<ref name=Anderson2012/> |
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}} |
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{{Starbox detail |
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| source = |
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| component1 = 69 Her A |
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| mass = 2.12<ref name=David2015/> |
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| radius = 2.2<ref name=cadars/> |
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| temperature = 9,141<ref name=Erspamer2003/> |
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| luminosity = 36.64<ref name=Anderson2012/> |
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| gravity = 4.02<ref name=Erspamer2003/> |
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| metal_fe = 0.29<ref name=Erspamer2003/> |
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| rotational_velocity = 141<ref name=Erspamer2003/> |
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| age_myr = 155<ref name=vanBelle2012/> |
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}} |
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{{Starbox catalog |
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| names={{odlist | B=e Her | F=69 Her | BD=+37°2864 | HD=156729 | HIP=84606 | HR=6436 | SAO=65921 }}<ref name=SIMBAD/> |
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}} |
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{{Starbox reference |
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| Simbad=69+Her |
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}} |
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{{Starbox end}} |
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'''69 Herculis''' is a [[binary star]]<ref name=Eggleton2008/> system in the northern [[constellation]] [[Hercules (constellation)|Hercules]]. It has the [[Bayer designation]] '''e Herculis''', while ''69 Herculis'' is the [[Flamsteed designation]]. This object is visible to the naked eye as a faint, white-hued star with a combined [[apparent visual magnitude]] of 4.63.<ref name=Eggleton2008/> The distance to this system can be estimated from [[stellar parallax|parallax]] measurements, which yields a range of 175 [[light year]]s. It is moving closer to the Earth with a heliocentric [[radial velocity]] of −10 km/s.<ref name=deBruijne2012/> |
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The magnitude 4.66<ref name=Eggleton2008/> primary, designated component A, is an [[A-type main-sequence star]] with a [[stellar classification]] of A2V.<ref name=Cowley1969/> It is 155<ref name=vanBelle2012/> million years old with 2.12<ref name=David2015/> times the [[mass of the Sun]]. The star is spinning with a [[projected rotational velocity]] of 155 km/s, which is creating an [[equatorial bulge]] that is 5% larger than the star's polar radius.<ref name=vanBelle2012/> It is about 2.2<ref name=cadars/> times the size of the Sun and is radiating 37<ref name=Anderson2012/> times the [[Sun's luminosity]] from its [[photosphere]] at an [[effective temperature]] of 9,141 K.<ref name=Erspamer2003/> |
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The secondary, component B, is magnitude 8.68 star with an [[angular separation]] of {{Val|0.840|ul=arcsecond}} from the primary, as of 2008.<ref name=Eggleton2008/> [[X-ray astronomy|X-ray emission]] has been detected from this system. As A-type stars are not expected to be X-ray sources, this emission is most likely coming from the companion.<ref name=Schröder2007/> |
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==References== |
==References== |
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{{reflist |
{{reflist|refs= |
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<ref name=SIMBAD>{{cite simbad | title=69 Her | access-date=2019-06-15 }}</ref> |
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<ref name=deBruijne2012>{{citation |
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| last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C. |
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| title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project |
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| journal=Astronomy & Astrophysics |
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| volume=546 | id=A61 | pages=14 | date=October 2012 |
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| doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D |
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| arxiv=1208.3048 | s2cid=59451347 | postscript=. }}</ref> |
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<ref name=vanLeeuwen2007>{{citation |
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| title=Validation of the new Hipparcos reduction |
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| last1=van Leeuwen | first1=F. | postscript=. |
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| journal=Astronomy and Astrophysics |
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| volume=474 | issue=2 | pages=653–664 | year=2007 |
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| arxiv=0708.1752 | bibcode=2007A&A...474..653V |
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| doi=10.1051/0004-6361:20078357 | s2cid=18759600 }}</ref> |
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<ref name=Anderson2012>{{citation |
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| title=XHIP: An extended hipparcos compilation |
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| last1=Anderson | first1=E. | last2=Francis | first2=Ch. |
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| journal=Astronomy Letters | postscript=. |
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| volume=38 | issue=5 | pages=331 | year=2012 |
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| bibcode=2012AstL...38..331A | arxiv=1108.4971 |
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| doi=10.1134/S1063773712050015 | s2cid=119257644 }}</ref> |
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<ref name=Eggleton2008>{{citation |
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| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. |
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| title=A catalogue of multiplicity among bright stellar systems |
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| journal=Monthly Notices of the Royal Astronomical Society |
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| volume=389 | issue=2 | pages=869–879 | date=September 2008 |
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| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | postscript=. |
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| bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 }}</ref> |
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<ref name=Erspamer2003>{{citation |
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| title=Automated spectroscopic abundances of A and F-type stars using echelle spectrographs. II. Abundances of 140 A-F stars from ELODIE |
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| last1=Erspamer | first1=D. | last2=North | first2=P. |
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| journal=Astronomy and Astrophysics |
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| volume=398 | pages=1121–1135 | date=February 2003 |
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| issue=3 | doi=10.1051/0004-6361:20021711 | arxiv=astro-ph/0210065 |
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| bibcode=2003A&A...398.1121E | s2cid=1109164 | postscript=. }}</ref> |
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<ref name=David2015>{{citation |
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| last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A. |
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| title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets |
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| journal=The Astrophysical Journal |
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| volume=804 | issue=2 | pages=146 | year=2015 |
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| bibcode=2015ApJ...804..146D | arxiv=1501.03154 |
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| doi=10.1088/0004-637X/804/2/146 | s2cid=33401607 | postscript=. }}</ref> |
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<ref name=vanBelle2012>{{citation |
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| last1=van Belle | first1=Gerard T. |
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| title=Interferometric observations of rapidly rotating stars |
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| journal=The Astronomy and Astrophysics Review |
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| volume=20 | issue=1 | page=51 | date=March 2012 |
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| doi=10.1007/s00159-012-0051-2 | bibcode=2012A&ARv..20...51V |
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| arxiv=1204.2572 | s2cid=119273474 |
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| postscript=. }}</ref> |
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<ref name=Schröder2007>{{citation |
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| title=X-ray emission from A-type stars |
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| last1=Schröder | first1=C. | last2=Schmitt | first2=J. H. M. M. |
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| journal=Astronomy and Astrophysics | postscript=. |
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| volume=475 | issue=2 | date=November 2007 | pages=677−684 |
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| doi=10.1051/0004-6361:20077429 | bibcode=2007A&A...475..677S | doi-access=free }}</ref> |
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<ref name=cadars>{{citation |
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| display-authors=1 | last1=Pasinetti Fracassini | first1=L. E. |
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| last2=Pastori | first2=L. | last3=Covino | first3=S. | last4=Pozzi | first4=A. |
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| title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) |
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| edition=Third | journal=Astronomy and Astrophysics |
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| volume=367 | issue=2 | pages=521–524 | date=February 2001 |
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| doi=10.1051/0004-6361:20000451 | postscript=. |
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| bibcode=2001A&A...367..521P | arxiv=astro-ph/0012289 | s2cid=425754 }}</ref> |
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<ref name=Cowley1969>{{citation | postscript=. |
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| last1=Cowley | first1=A. | last2=Cowley | first2=C. |
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| last3=Jaschek | first3=M. | last4=Jaschek | first4=C. |
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| title=A study of the bright A stars. I. A catalogue of spectral classifications |
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| display-authors=1 | journal=Astronomical Journal |
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| volume=74 | pages=375–406 | date=April 1969 |
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| doi=10.1086/110819 | bibcode=1969AJ.....74..375C }}</ref> |
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}} |
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{{Stars of Hercules}} |
{{Stars of Hercules}} |
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{{DEFAULTSORT:69 Herculis}} |
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[[Category:Hercules (constellation)]] |
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[[Category:A-type main-sequence stars]] |
[[Category:A-type main-sequence stars]] |
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[[Category: |
[[Category:Binary stars]] |
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[[Category:Hercules (constellation)]] |
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[[Category:Bayer objects|Herculis, e]] |
[[Category:Bayer objects|Herculis, e]] |
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[[Category: |
[[Category:Durchmusterung objects]] |
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[[Category:Flamsteed objects|Herculis, 069]] |
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[[Category:Henry Draper Catalogue objects|156729]] |
[[Category:Henry Draper Catalogue objects|156729]] |
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[[Category:Hipparcos objects|084606]] |
[[Category:Hipparcos objects|084606]] |
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[[Category: |
[[Category:Bright Star Catalogue objects|6436]] |
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{{main-star-stub}} |
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Latest revision as of 19:31, 18 July 2024
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 17h 17m 40.25427s[1] |
| Declination | +37° 17′ 29.3995″[1] |
| Apparent magnitude (V) | 4.63 (4.66 + 8.68)[2] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A2V[3] |
| B−V color index | 0.043±0.003[4] |
| Astrometry | |
| Radial velocity (Rv) | −9.90±1.78[5] km/s |
| Proper motion (μ) | RA: −43.05[1] mas/yr Dec.: +64.36[1] mas/yr |
| Parallax (π) | 18.59 ± 0.33 mas[1] |
| Distance | 175 ± 3 ly (53.8 ± 1.0 pc) |
| Absolute magnitude (MV) | 0.99[4] |
| Details | |
| 69 Her A | |
| Mass | 2.12[6] M☉ |
| Radius | 2.2[7] R☉ |
| Luminosity | 36.64[4] L☉ |
| Surface gravity (log g) | 4.02[8] cgs |
| Temperature | 9,141[8] K |
| Metallicity [Fe/H] | 0.29[8] dex |
| Rotational velocity (v sin i) | 141[8] km/s |
| Age | 155[9] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
69 Herculis is a binary star[2] system in the northern constellation Hercules. It has the Bayer designation e Herculis, while 69 Herculis is the Flamsteed designation. This object is visible to the naked eye as a faint, white-hued star with a combined apparent visual magnitude of 4.63.[2] The distance to this system can be estimated from parallax measurements, which yields a range of 175 light years. It is moving closer to the Earth with a heliocentric radial velocity of −10 km/s.[5]
The magnitude 4.66[2] primary, designated component A, is an A-type main-sequence star with a stellar classification of A2V.[3] It is 155[9] million years old with 2.12[6] times the mass of the Sun. The star is spinning with a projected rotational velocity of 155 km/s, which is creating an equatorial bulge that is 5% larger than the star's polar radius.[9] It is about 2.2[7] times the size of the Sun and is radiating 37[4] times the Sun's luminosity from its photosphere at an effective temperature of 9,141 K.[8]
The secondary, component B, is magnitude 8.68 star with an angular separation of 0.840″ from the primary, as of 2008.[2] X-ray emission has been detected from this system. As A-type stars are not expected to be X-ray sources, this emission is most likely coming from the companion.[11]
References
[edit]- ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d e Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ a b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- ^ a b c d Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ a b David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (2) (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ a b c d e Erspamer, D.; North, P. (February 2003), "Automated spectroscopic abundances of A and F-type stars using echelle spectrographs. II. Abundances of 140 A-F stars from ELODIE", Astronomy and Astrophysics, 398 (3): 1121–1135, arXiv:astro-ph/0210065, Bibcode:2003A&A...398.1121E, doi:10.1051/0004-6361:20021711, S2CID 1109164.
- ^ a b c van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
- ^ "69 Her". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-15.
- ^ Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics, 475 (2): 677−684, Bibcode:2007A&A...475..677S, doi:10.1051/0004-6361:20077429.
