| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lynx |
| Right ascension | 09 06 31.76860 |
| Declination | +38° 27′ 07.9756″ |
| Apparent magnitude (V) | 4.56 |
| Characteristics | |
| Spectral type | G7 II Ba0.2 |
| B−V color index | 1.037±0.003 |
| Astrometry | |
| Radial velocity (Rv) | +16.6±0.2 km/s |
| Proper motion (μ) | RA: −27.653 mas/yr Dec.: −15.055 mas/yr |
| Parallax (π) | 5.0045 ± 0.1977 mas |
| Distance | 650 ± 30 ly (200 ± 8 pc) |
| Absolute magnitude (MV) | −1.46±0.093 |
| Details | |
| Mass | 4.60 M☉ |
| Radius | 33±5 R☉ |
| Luminosity | 1,168.35 L☉ |
| Surface gravity (log g) | 1.75 cgs |
| Temperature | 4,899 K |
| Metallicity | −0.14 dex |
| Other designations | |
| BD+39°2200, FK5 1237, HD 77912, HIP 44700, HR 3612, SAO 61254 | |
| Database references | |
| SIMBAD | data |
HD 77912 is a single star in the northern constellation of Lynx. It is visible to the naked eye with an apparent visual magnitude of 4.56. The star is located 650 light years from the Sun, as determined from its annual parallax shift of 5.0 mas. It is moving further away with a heliocentric radial velocity of +16.6 km/s. HD 77912 has a peculiar velocity of 23.1+2.9
−1.1 km/s, which may mark it as a runaway star.
The stellar classification of HD 77912 is G7 II Ba0.2, indicating it is a bright giant with a mild overabundance of barium. It has 4.6 times the mass of the Sun and has expanded to 33 times the Sun's radius. The star is radiating 1,168 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,899 K.
References
- ^ 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.
- ^ Van Belle, G. T.; et al. (2009), "Supergiant temperatures and linear radii from near-infrared interferometry", Monthly Notices of the Royal Astronomical Society, 394 (4): 1925, arXiv:0811.4239, Bibcode:2009MNRAS.394.1925V, doi:10.1111/j.1365-2966.2008.14146.x, S2CID 118372600.
- ^ Lu, Phillip K. (1991), "Taxonomy of barium stars", Astronomical Journal, 101: 2229, Bibcode:1991AJ....101.2229L, doi:10.1086/115845.
- ^ 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.
- Park, Sunkyung; et al. (2013), "Wilson-Bappu Effect: Extended to Surface Gravity", The Astronomical Journal, 146 (4): 73, arXiv:1307.0592, Bibcode:2013AJ....146...73P, doi:10.1088/0004-6256/146/4/73, S2CID 119187733.
- ^ Liu, Y. J.; et al. (April 2014), "The Lithium Abundances of a Large Sample of Red Giants", The Astrophysical Journal, 785 (2): 12, arXiv:1404.1687, Bibcode:2014ApJ...785...94L, doi:10.1088/0004-637X/785/2/94, S2CID 119226316, 94.
- "HD 77912". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-30.
- Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- Tetzlaff, N.; et al. (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, S2CID 118629873.
