Astronomy:HD 34557
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Short description: Double star in the constellation Auriga
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Auriga[1] |
| Right ascension | 05h 20m 14.66904s[2] |
| Declination | +41° 05′ 10.3522″[2] |
| Apparent magnitude (V) | 5.52[3] (5.58 + 8.55)[4] |
| Characteristics | |
| Spectral type | A3V[5] |
| U−B color index | +0.04[3] |
| B−V color index | +0.11[3] |
| Astrometry | |
| Radial velocity (Rv) | 22±4.2[6] km/s |
| Proper motion (μ) | RA: −18.97[2] mas/yr Dec.: −53.43[2] mas/yr |
| Parallax (π) | 11.77 ± 0.58[2] mas |
| Distance | 280 ± 10 ly (85 ± 4 pc) |
| Absolute magnitude (MV) | +0.82[1] |
| Details | |
| Radius | 1.6[7] R☉ |
| Rotational velocity (v sin i) | 217[8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 34557 is a double star in the northern constellation of Auriga. The fainter star has an angular separation of 0.380″ from the primary component.[4] They have a combined apparent magnitude of 5.52,[3] making HD 34557 faintly visible to the naked eye from dark skies. Based upon parallax measurements made with the Hipparcos satellite, this system is roughly 280 light years away.[2] The primary component is spinning rapidly, with a projected rotational velocity of 217 km/s.[8] It has a stellar classification of A3V,[5] making it an A-type main sequence star.
References
- ↑ 1.0 1.1 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 2.5 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
- ↑ 3.0 3.1 3.2 3.3 Deutschman, W. A.; Davis, R. J.; Schild, R. E. (February 1976), "The galactic distribution of interstellar absorption as determined from the Celescope catalog of ultraviolet stellar observations and a new catalog of UBV, H-beta photoelectric observations", Astrophysical Journal Supplement Series 30: 97–225, doi:10.1086/190359, Bibcode: 1976ApJS...30...97D
- ↑ 4.0 4.1 Eggleton, P. P. et al. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E
- ↑ 5.0 5.1 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
- ↑ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ Pasinetti Fracassini, L. E. et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy & Astrophysics 367 (2): 521–24, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P
- ↑ 8.0 8.1 Royer, F. et al. (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
References
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