Astronomy:HD 37519
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Auriga |
| Right ascension | 05h 40m 35.90737s[1] |
| Declination | +31° 21′ 29.5262″[1] |
| Apparent magnitude (V) | 6.04[2] |
| Characteristics | |
| Spectral type | B9.5III-IV(p)? (Hg?)[3] |
| U−B color index | −0.21[2] |
| B−V color index | +0.05[2] |
| Variable type | suspected[4] |
| Astrometry | |
| Radial velocity (Rv) | −10.2±3.4[5] km/s |
| Proper motion (μ) | RA: −5.051[1] mas/yr Dec.: −8.187[1] mas/yr |
| Parallax (π) | 4.0335 ± 0.1112[1] mas |
| Distance | 810 ± 20 ly (248 ± 7 pc) |
| Absolute magnitude (MV) | −0.43[6] |
| Details | |
| Radius | 3.0[7] R☉ |
| Luminosity | 110[8] L☉ |
| Temperature | 8,289[8] K |
| Rotational velocity (v sin i) | 195[9] km/s |
| Age | 375[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 37519 or Andrew's Star is a star in the northern constellation Auriga. It has a blue-white hue and is dimly visible to the naked eye with an apparent visual magnitude of 6.04.[2] The distance to HD 37519 is approximately 810 light years based on parallax, but it is drifting closer with a radial velocity of −10 km/s.[5]
Cowley in 1972 found a stellar classification of B9.5III-IV(p)? (Hg?) for this star,[3] suggesting it is an evolved B-type star and a suspected chemically peculiar star of the mercury-manganese type.[11] It is estimated to be 375 million years old and with a high rate of spin, showing a projected rotational velocity of 195 km/s.[9] In March 1964, a suspected flare of HD 37519 was detected that increased the star's brightness by about three magnitudes. Smaller variations of up to two magnitudes were detected a few days later,[12] suggesting there might be a flare star companion. However, follow-up observations failed to confirm the variability.[13] The star is radiating 110[8] times the luminosity of the Sun from its photosphere at an effective temperature of 8,289 km/s.[8]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 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. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
- ↑ 3.0 3.1 Cowley, A. (November 1972), "Spectral classification of the bright B8 stars", Astronomical Journal 77: 750–755, doi:10.1086/111348, Bibcode: 1972AJ.....77..750C.
- ↑ Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
- ↑ 5.0 5.1 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.
- ↑ 6.0 6.1 Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters 38 (11): 694–706, doi:10.1134/S1063773712110035, Bibcode: 2012AstL...38..694G.
- ↑ 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 8.2 8.3 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.
- ↑ 9.0 9.1 Abt, Helmut A. et al. (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal 573 (1): 359–365, doi:10.1086/340590, Bibcode: 2002ApJ...573..359A.
- ↑ "HD 36780". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+36780.
- ↑ Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics 498 (3): 961–966, doi:10.1051/0004-6361/200810788, Bibcode: 2009A&A...498..961R.
- ↑ Mammano, A. (May 1966), "Spectrum of the Early-Type Flare Star BD +13 1048", Information Bulletin on Variable Stars 134: 1, Bibcode: 1966IBVS..134....1M.
- ↑ Andrews, A. D. (July 1996), "A Re-Examination of the Suspected Early-Type Flare Star BD+31 1048 (bs 1938) in Auriga: a Skeleton from the Cupboard", Irish Astronomical Journal 23 (2): 189, Bibcode: 1996IrAJ...23..189A.
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