| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04 04 41.71484 |
| Declination | +22° 04′ 54.9243″ |
| Apparent magnitude (V) | 4.36 |
| Characteristics | |
| Spectral type | K0 III-IIIb |
| U−B color index | 0.95 |
| B−V color index | 1.07 |
| R−I color index | 0.53 |
| Astrometry | |
| Radial velocity (Rv) | +9.52±0.11 km/s |
| Proper motion (μ) | RA: +90.53 mas/yr Dec.: −59.47 mas/yr |
| Parallax (π) | 17.43 ± 0.21 mas |
| Distance | 187 ± 2 ly (57.4 ± 0.7 pc) |
| Absolute magnitude (MV) | 0.57 |
| Details | |
| Mass | 1.99 M☉ |
| Radius | 10.15±0.69 R☉ |
| Luminosity | 60±6 L☉ |
| Surface gravity (log g) | 2.77 cgs |
| Temperature | 4,732±26 K |
| Metallicity | +0.01 dex |
| Rotational velocity (v sin i) | 2.8 km/s |
| Age | 1.39 Gyr |
| Other designations | |
| 37 Tau, BD+21° 585, FK5 1112, HD 25604, HIP 19038, HR 1256, SAO 76430, WDS J04047+2205A | |
| Database references | |
| SIMBAD | data |
37 Tauri is a single, orange-hued star in the zodiac constellation of Taurus. It can be seen with the naked eye, having an apparent visual magnitude of 4.36. A magnitude 10.01 visual companion has an angular separation of 134.30″ on a position angle of 138.6°, as of 2003. Based on an annual parallax shift of 17.43±0.21 mas, 37 Tauri is about 187 light years away. It is moving further from the Sun with a heliocentric radial velocity of 9.5 km/s.
This is an evolved K-type giant star with a stellar classification of K0 III-IIIb. At the age of 1.39 billion years, it has become a red clump giant, indicating that it is generating energy through helium fusion at its core. The star has around double the mass of the Sun and has expanded to 10 times the Sun's radius. It is radiating roughly 60 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,732 K.
Chinese astronomy
In Chinese astronomy, 37 Tauri is called 月, Pinyin: Yuè, meaning Moon, because this star is marking itself and stand alone in Moon asterism, Hairy Head mansion (see : Chinese constellation).
References
- ^ 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.
- ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
- ^ Ducati, J. R. (2002), "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system", CDS/ADC Collection of Electronic Catalogues, 2237, Bibcode:2002yCat.2237....0D.
- ^ Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
- ^ Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209, S2CID 121883397.
- ^ Piau, L.; et al. (2010), "Surface convection and red-giants radii measurements", Astronomy and Astrophysics, 526: 12, arXiv:1010.3649, Bibcode:2011A&A...526A.100P, doi:10.1051/0004-6361/201014442, S2CID 118533297, A100.
- "37 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-22.
- Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920
- Puzeras, E.; et al. (October 2010), "High-resolution spectroscopic study of red clump stars in the Galaxy: iron-group elements", Monthly Notices of the Royal Astronomical Society, 408 (2): 1225–1232, arXiv:1006.3857, Bibcode:2010MNRAS.408.1225P, doi:10.1111/j.1365-2966.2010.17195.x, S2CID 44228180.
- Ian Ridpath's Star Tales - Taurus the Bull
