HD 34968
  | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Lepus |
| Right ascension | 05h 20m 26.91498s |
| Declination | −21° 14′ 23.1367″ |
| Apparent magnitude (V) | 4.69 (4.73 + 8.45) |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A0 V |
| B−V color index | −0.048±0.003 |
| Astrometry | |
| Radial velocity (Rv) | 30.9±0.5 km/s |
| Proper motion (μ) | RA: +17.149 mas/yr Dec.: −9.382 mas/yr |
| Parallax (π) | 8.7188±0.1661 mas |
| Distance | 374 ± 7 ly (115 ± 2 pc) |
| Absolute magnitude (MV) | −0.82 |
| Details | |
| HD 34968 A | |
| Mass | 2.6 M☉ |
| Radius | 4.4 R☉ |
| Luminosity | 177 L☉ |
| Surface gravity (log g) | 3.56 cgs |
| Temperature | 10,046 K |
| Rotational velocity (v sin i) | 84 km/s |
| Other designations | |
| BD−21°1135, HD 34968, HIP 24927, HR 1762, SAO 170327, WDS J05204-2114A | |
| Database references | |
| SIMBAD | data |
HD 34968 is a binary star system in the southern constellation Lepus. The combined apparent visual magnitude of 4.69 is bright enough to be visible to the naked eye. The distance to HD 34968 can be estimated from its annual parallax shift of 8.7 mas, yielding a range of 374 light years. It is moving further away from the Earth with a heliocentric radial velocity of 31 km/s, having come within 118.6 ly some 3,686,000 years ago.
The primary member, component A, is a magnitude 4.73 star. Houk and Smith-Moore (1978) gave this object a stellar classification of A0 V, indicating it is an ordinary A-type main-sequence star. Gray and Garrison (1987) classified it as B9.5 III and noted that the spectrum is slightly variable. It is 99.2%±2.6% of the way through its main sequence lifetime, with 2.6 times the mass of the Sun and 4.4 times the Sun's radius. The star is spinning with a projected rotational velocity of 84 km/s. It is radiating 177 times the Sun's luminosity from its photosphere at an effective temperature of 10,046 K.
The fainter secondary, component B, is a magnitude 8.45 star at an angular separation of 4.1″ along a position angle of 279°, as of 2008.
References
- 1 2 3 4 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. XHIP record for this object at VizieR.
- 1 2 3 4 5 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.
- 1 2 3 4 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.
- 1 2 3 4 Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- 1 2 Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
- 1 2 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- 1 2 3 4 5 6 7 Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467.
- ↑ "HD 34968". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-26.
- ↑ Gray, R. O.; Garrison, R. F. (December 1987), "The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation", Astrophysical Journal Supplement, 65: 581, Bibcode:1987ApJS...65..581G, doi:10.1086/191237.
- ↑ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920
