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]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 mas[1] |
| 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 |
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
edit- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d 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.
- ^ a b Cowley, A. (November 1972), "Spectral classification of the bright B8 stars", Astronomical Journal, 77: 750–755, Bibcode:1972AJ.....77..750C, doi:10.1086/111348.
- ^ Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
- ^ a b 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, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
- ^ a b Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
- ^ 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, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ a b c d 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.
- ^ a b Abt, Helmut A.; et al. (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
- ^ "HD 36780". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-28.
- ^ Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788.
- ^ 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.