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]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 |
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
edit- ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600
- ^ a b 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
- ^ a b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819
- ^ a b 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
- ^ a b Pourbaix, D.; et al. (September 2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy and Astrophysics, 424: 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088
- ^ a b c McDonald, I.; et al. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. S2CID 118665352.
- ^ 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, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298
- ^ a b Abt, Helmut A.; Boonyarak, Chayan (November 2004), "Tidal Effects in Binaries of Various Periods", The Astrophysical Journal, 616 (1): 562–566, Bibcode:2004ApJ...616..562A, doi:10.1086/423795
External links
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