Astronomy:HD 34968
  | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Lepus[1] |
| Right ascension | 05h 20m 26.91498s[2] |
| Declination | −21° 14′ 23.1367″[2] |
| Apparent magnitude (V) | 4.69 (4.73 + 8.45)[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | A0 V[5] |
| B−V color index | −0.048±0.003[1] |
| Astrometry | |
| Radial velocity (Rv) | 30.9±0.5[6] km/s |
| Proper motion (μ) | RA: +17.149[2] mas/yr Dec.: −9.382[2] mas/yr |
| Parallax (π) | 8.7188 ± 0.1661[2] mas |
| Distance | 374 ± 7 ly (115 ± 2 pc) |
| Absolute magnitude (MV) | −0.82[1] |
| Details | |
| HD 34968 A | |
| Mass | 2.6[7] M☉ |
| Radius | 4.4[7] R☉ |
| Luminosity | 177[7] L☉ |
| Surface gravity (log g) | 3.56[7] cgs |
| Temperature | 10,046[7] K |
| Rotational velocity (v sin i) | 84[4] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 34968 is a binary star[3] system in the southern constellation Lepus. The combined apparent visual magnitude of 4.69[3] 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,[6] having come within 118.6 ly some 3,686,000 years ago.[1]
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,[5] 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.[9] It is 99.2%±2.6% of the way through its main sequence lifetime,[4] with 2.6 times the mass of the Sun and 4.4 times the Sun's radius.[7] The star is spinning with a projected rotational velocity of 84 km/s.[4] It is radiating 177 times the Sun's luminosity from its photosphere at an effective temperature of 10,046 K.[7]
The fainter secondary, component B, is a magnitude 8.45[3] star at an angular separation of 4.1″ along a position angle of 279°, as of 2008.[10]
References
- ↑ 1.0 1.1 1.2 1.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ 3.0 3.1 3.2 3.3 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.
- ↑ 4.0 4.1 4.2 4.3 Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
- ↑ 5.0 5.1 Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1988mcts.book.....H.
- ↑ 6.0 6.1 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S.
- ↑ "HD 34968". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+34968.
- ↑ 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, doi:10.1086/191237, Bibcode: 1987ApJS...65..581G.
- ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M
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