HD 176871

HD 176871 is a single[8] star in the northern constellation of Lyra, positioned near the southern constellation border with Vulpecula. This object has a blue-white hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.69.[2] It is located at a distance of approximately 790 light years from the Sun based on parallax, and has an absolute magnitude of −0.80.[2] The star is drifting closer with a radial velocity of −20 km/s.[2]

HD 176871
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra
Right ascension 19h 01m 17.35683s[1]
Declination +26° 17′ 29.0764″[1]
Apparent magnitude (V) 5.69[2]
Characteristics
Spectral type B5V[3][2][4]
U−B color index −0.55[3]
B−V color index −0.086±0.002[2]
Astrometry
Radial velocity (Rv)−20.4±1.2[2] km/s
Proper motion (μ) RA: −0.489[1] mas/yr
Dec.: −9.207[1] mas/yr
Parallax (π)4.1038 ± 0.0835 mas[1]
Distance790 ± 20 ly
(244 ± 5 pc)
Absolute magnitude (MV)−0.80[2]
Details
Mass5.4[4] M☉
Luminosity232.54[5] L☉
Surface gravity (log g)4.5[4] cgs
Temperature10,540[5] K
Rotational velocity (v sin i)268±34[6] km/s
Age11[4] Myr
Other designations
BD+26°3429, FK5 3518, GC 26151, HD 176871, HIP 93393, HR 7202, SAO 86707[7]
Database references
SIMBADdata

This is a normal B-type main-sequence star with a stellar classification of B5V,[3] which means it is generating energy via core hydrogen fusion. The star is around 11[4] million years old with 5.4[4] times the mass of the Sun and is spinning rapidly with a projected rotational velocity of 268 km/s.[6] It is radiating 233[5] times the luminosity of the Sun from its photosphere at an effective temperature of 10,540 K.[5]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data 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 source at VizieR.
  2. 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.
  3. Hill, P. W.; Lynas-Gray, A. E. (September 1977), "UBV photometry and MK spectral classification of northern early-type stars at intermediate galactic latitudes.", Monthly Notices of the Royal Astronomical Society, 180 (4): 691–702, Bibcode:1977MNRAS.180..691H, doi:10.1093/mnras/180.4.691.
  4. Gullikson, Kevin; et al. (2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 40, arXiv:1604.06456, Bibcode:2016AJ....152...40G, doi:10.3847/0004-6256/152/2/40, S2CID 119179065.
  5. McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–357, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  6. Maestro, V.; et al. (2013), "Optical interferometry of early-type stars with PAVO@CHARA - I. Fundamental stellar properties", Monthly Notices of the Royal Astronomical Society, 434 (2): 1321, arXiv:1306.5937, Bibcode:2013MNRAS.434.1321M, doi:10.1093/mnras/stt1092.
  7. "HD 176871". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-10.
  8. 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.
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