Astronomy:HD 176871
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| Distance | 790 ± 20 ly (244 ± 5 pc) |
| Absolute magnitude (MV) | −0.80[2] |
| Details | |
| Mass | 5.4[4] M☉ |
| Luminosity | 232.54[5] L☉ |
| Surface gravity (log g) | 4.5[4] cgs |
| Temperature | 10,540[5] K |
| Rotational velocity (v sin i) | 268±34[6] km/s |
| Age | 11[4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
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
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 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, doi:10.1093/mnras/180.4.691, Bibcode: 1977MNRAS.180..691H.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Gullikson, Kevin et al. (2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal 152 (2): 40, doi:10.3847/0004-6256/152/2/40, Bibcode: 2016AJ....152...40G.
- ↑ 5.0 5.1 5.2 5.3 McDonald, I. et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–357, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ 6.0 6.1 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, doi:10.1093/mnras/stt1092, Bibcode: 2013MNRAS.434.1321M.
- ↑ "HD 176871". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+176871.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
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