Astronomy:HD 77912
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Lynx |
| Right ascension | 09h 06m 31.76860s[1] |
| Declination | +38° 27′ 07.9756″[1] |
| Apparent magnitude (V) | 4.56[2] |
| Characteristics | |
| Spectral type | G7 II Ba0.2[3] |
| B−V color index | 1.037±0.003[4] |
| Astrometry | |
| Radial velocity (Rv) | +16.6±0.2[4] km/s |
| Proper motion (μ) | RA: −27.653[1] mas/yr Dec.: −15.055[1] mas/yr |
| Parallax (π) | 5.0045 ± 0.1977[1] mas |
| Distance | 650 ± 30 ly (200 ± 8 pc) |
| Absolute magnitude (MV) | −1.46±0.093[5] |
| Details | |
| Mass | 4.60[6] M☉ |
| Radius | 33±5[2] R☉ |
| Luminosity | 1,168.35[4] L☉ |
| Surface gravity (log g) | 1.75[6] cgs |
| Temperature | 4,899[6] K |
| Metallicity [Fe/H] | −0.14[6] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 77912 is a single[8] star in the northern constellation of Lynx. It is visible to the naked eye with an apparent visual magnitude of 4.56.[2] The star is located 650 light years from the Sun, as determined from its annual parallax shift of 5.0 mas.[1] It is moving further away with a heliocentric radial velocity of +16.6 km/s.[4] HD 77912 has a peculiar velocity of 23.1+2.9
−1.1 km/s, which may mark it as a runaway star.[9]
The stellar classification of HD 77912 is G7 II Ba0.2,[3] indicating it is a bright giant with a mild overabundance of barium. It has 4.6[6] times the mass of the Sun and has expanded to 33[2] times the Sun's radius. The star is radiating 1,168[4] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,899 K.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
- ↑ 2.0 2.1 2.2 2.3 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, doi:10.1111/j.1365-2966.2008.14146.x, Bibcode: 2009MNRAS.394.1925V.
- ↑ 3.0 3.1 Lu, Phillip K. (1991), "Taxonomy of barium stars", Astronomical Journal 101: 2229, doi:10.1086/115845, Bibcode: 1991AJ....101.2229L.
- ↑ 4.0 4.1 4.2 4.3 4.4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ Park, Sunkyung et al. (2013), "Wilson-Bappu Effect: Extended to Surface Gravity", The Astronomical Journal 146 (4): 73, doi:10.1088/0004-6256/146/4/73, Bibcode: 2013AJ....146...73P.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Liu, Y. J. et al. (April 2014), "The Lithium Abundances of a Large Sample of Red Giants", The Astrophysical Journal 785 (2): 12, doi:10.1088/0004-637X/785/2/94, 94, Bibcode: 2014ApJ...785...94L.
- ↑ "HD 77912". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+77912.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 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, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T.
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