HR 6875
| Observation data EpochJ2000EquinoxJ2000 | |
|---|---|
| Constellation | Corona Australis |
| Right ascension | 18h24m18.24148s[1] |
| Declination | −44° 06′ 36.9008″[1] |
| Apparent magnitude(V) | 5.24[2] |
| Characteristics | |
| Spectral type | B3 V[3] |
| B−Vcolor index | −0.163±0.004[2] |
| Astrometry | |
| Radial velocity(Rv) | +0.00±7.40[2]km/s |
| Proper motion(μ) | RA:−2.949[1]mas/yr Dec.:−23.107[1]mas/yr |
| Parallax(π) | 5.9327 ± 0.2341mas[1] |
| Distance | 550 ± 20ly (169 ± 7pc) |
| Absolute magnitude(MV) | −0.63[2] |
| Details | |
| Mass | 6.2±0.1[4]M☉ |
| Radius | 3.9[5]R☉ |
| Luminosity (bolometric) | 1,098[6]L☉ |
| Temperature | 20,350[6]K |
| Rotational velocity(vsini) | 248±12[7]km/s |
| Age | 103[8]Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HR 6875,previously known asSigma Telescopii,is a single[10]starin theconstellationCorona Australis.It has a blue-white hue and is dimly visible to the naked eye with anapparent visual magnitudeof 5.24.[2]This object is located at a distance of approximately 550light yearsfrom theSunbased onparallax.[1]It is listed as a member of theSco OB2association.[7]
This is a hotB-type main-sequence starwith astellar classificationof B3 V.[3]It is around 103[8]million years old and is spinning rapidly with aprojected rotational velocityof 248 km/s or perhaps higher.[7]The star has six[4]times themass of the Sunand about four[5]times theSun's radius.It is radiating more than a thousand[6]times theluminosity of the Sunfrom itsphotosphereat aneffective temperatureof 20,350 K.[6]
A magnitude 10.13visual companionis located at anangular separationof74″along aposition angleof 162°.[11]
References
[edit]- ^abcdefBrown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData Release 2: Summary of the contents and survey properties ".Astronomy & Astrophysics.616.A1.arXiv:1804.09365.Bibcode:2018A&A...616A...1G.doi:10.1051/0004-6361/201833051.Gaia DR2 record for this sourceatVizieR.
- ^abcdeAnderson, 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,S2CID119257644.
- ^abHouk, Nancy (1978),Michigan catalogue of two-dimensional spectral types for the HD stars,vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan,Bibcode:1978mcts.book.....H.
- ^abTetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun",Monthly Notices of the Royal Astronomical Society,410(1): 190–200,arXiv:1007.4883,Bibcode:2011MNRAS.410..190T,doi:10.1111/j.1365-2966.2010.17434.x,S2CID118629873.
- ^abPasinetti 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,S2CID425754.
- ^abcdHohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants",Astronomische Nachrichten,331(4): 349,arXiv:1003.2335,Bibcode:2010AN....331..349H,doi:10.1002/asna.200911355,S2CID111387483.
- ^abcBrown, A. G. A.; Verschueren, W. (1997), "High S/N Echelle spectroscopy in young stellar groups. II. Rotational velocities of early-type stars in SCO OB2",Astronomy and Astrophysics,319:811,arXiv:astro-ph/9608089,Bibcode:1997A&A...319..811B.
- ^abGontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars",Astronomy Letters,38(11): 694–706,arXiv:1606.09028,Bibcode:2012AstL...38..694G,doi:10.1134/S1063773712110035,S2CID119108982.
- ^"HD 168905".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2018-07-14.
- ^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,S2CID14878976.
- ^Mason, B. D.; et al. (2014),"The Washington Visual Double Star Catalog",The Astronomical Journal,122(6): 3466,Bibcode:2001AJ....122.3466M,doi:10.1086/323920,retrieved2015-07-22
