Astronomy:HD 34790
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Auriga |
| Right ascension | 05h 21m 12.68806s[1] |
| Declination | +29° 34′ 11.5926″[1] |
| Apparent magnitude (V) | 5.66[2] |
| Characteristics | |
| Spectral type | A1Vs[3] |
| U−B color index | +0.13[4] |
| B−V color index | +0.06[4] |
| Astrometry | |
| Radial velocity (Rv) | −18.7±0.9[5] km/s |
| Proper motion (μ) | RA: −0.40[1] mas/yr Dec.: +0.91[1] mas/yr |
| Parallax (π) | 11.29 ± 0.32 mas |
| Distance | 289 ± 8 ly (89 ± 3 pc) |
| Orbit[6] | |
| Period (P) | 2.1517 d |
| Eccentricity (e) | 0.0 |
| Periastron epoch (T) | 21140.396 |
| Details | |
| Luminosity | 35[7] L☉ |
| Temperature | 8,682[7] K |
| Rotational velocity (v sin i) | 52[8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 34790 is a double-lined spectroscopic binary[9] star system in the northern constellation of Auriga. It has a combined apparent magnitude of 5.66,[2] which means it is faintly visible to the naked eye. Based upon observations by the Hipparcos satellite, it is located around 289 light years away.[1] It has a combined stellar classification of A1Vs,[3] matching that of an A-type main sequence star, and shines with 35 times the luminosity of the Sun.[7]
The two stars orbit each other with a period of only 2.15 days and an eccentricity of zero, indicating their orbit is close to circular.[6] They are orbiting sufficiently close to each other that their rotation periods have most likely become tidally locked—meaning they always maintain the same face toward each other.[9]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V
- ↑ 2.0 2.1 Oja, T. (August 1991), "UBV photometry of stars whose positions are accurately known. VI", Astronomy and Astrophysics Supplement Series 89 (2): 415–419, Bibcode: 1991A&AS...89..415O
- ↑ 3.0 3.1 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C
- ↑ 4.0 4.1 Osawa, K.; Hata, S. (1962), "Three-color photometry of B8-A2 stars (II).", Annals of the Tokyo Astronomical Observatory 7: 209, Bibcode: 1962AnTok...7..209O
- ↑ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Carnegie Institute of Washington, D.C.), Bibcode: 1953GCRV..C......0W
- ↑ 6.0 6.1 Pourbaix, D. et al. (September 2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy and Astrophysics 424: 727–732, doi:10.1051/0004-6361:20041213, Bibcode: 2004A&A...424..727P
- ↑ 7.0 7.1 7.2 McDonald, I. et al. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society 427 (1): 343–57. doi:10.1111/j.1365-2966.2012.21873.x. Bibcode: 2012MNRAS.427..343M.
- ↑ Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics 463 (2): 671–682, doi:10.1051/0004-6361:20065224, Bibcode: 2007A&A...463..671R
- ↑ 9.0 9.1 Abt, Helmut A.; Boonyarak, Chayan (November 2004), "Tidal Effects in Binaries of Various Periods", The Astrophysical Journal 616 (1): 562–566, doi:10.1086/423795, Bibcode: 2004ApJ...616..562A
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