Astronomy:Delta2 Tauri
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 24m 05.75985s[1] |
| Declination | +17° 26′ 38.8583″[1] |
| Apparent magnitude (V) | +4.80[2] |
| Characteristics | |
| Spectral type | A2 Vs[3] |
| U−B color index | +0.12[2] |
| B−V color index | +0.15[2] |
| Astrometry | |
| Radial velocity (Rv) | +37.1[4] km/s |
| Proper motion (μ) | RA: +108.16[1] mas/yr Dec.: −34.66[1] mas/yr |
| Parallax (π) | 20.21 ± 0.40[1] mas |
| Distance | 161 ± 3 ly (49.5 ± 1.0 pc) |
| Absolute magnitude (MV) | +1.62[5] |
| Details | |
| Mass | 1.79[6] M☉ |
| Radius | 1.8[7] R☉ |
| Luminosity | 27[8] L☉ |
| Surface gravity (log g) | 4.15[4] cgs |
| Temperature | 7,997[4] K |
| Metallicity [Fe/H] | +0.14[4] dex |
| Rotational velocity (v sin i) | 42[4] km/s |
| Age | 449[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Delta2 Tauri (δ2 Tauri) is a solitary,[10] white-hued star in the zodiac constellation of Taurus. Based upon an annual parallax shift of 20.21 mas as seen from Earth,[1] it is located roughly 161 light years distant from the Sun. It is separated from δ1 Tauri by 0.3° on the sky[11] and is faintly visible to the naked eye with an apparent visual magnitude of +4.80.[2] The star is considered a member of the Hyades cluster.[12]
At the estimated age of 449 million years,[6] this is an A-type main-sequence star with a stellar classification of A2 Vs,[3] where the 's' suffix indicates narrow (sharp) absorption lines. It has 1.8[6] times the mass of the Sun and about 1.8[7] times the Sun's radius. The star is radiating 27[8] times the Sun's luminosity from its photosphere at an effective temperature of 7,997 K.[4]
δ2 Tauri is a source of X-ray emission with a luminosity of 101.1×1020 W. Since A-type stars are not normally a source of X-rays, this emission may be coming from an unknown companion or from a line of sight source.[13]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
- ↑ 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 Paunzen, E. et al. (July 2001), "A spectroscopic survey for λ Bootis stars. II. The observational data", Astronomy and Astrophysics 373 (2): 625–632, doi:10.1051/0004-6361:20010630, Bibcode: 2001A&A...373..625P.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Gebran, M. et al. (May 2016), "A new method for the inversion of atmospheric parameters of A/Am stars", Astronomy & Astrophysics 589: 10, doi:10.1051/0004-6361/201528052, A83, Bibcode: 2016A&A...589A..83G.
- ↑ Eggen, Olin J. (July 1998), "The Age Range of Hyades Stars", The Astronomical Journal 116 (1): 284–292, doi:10.1086/300413, Bibcode: 1998AJ....116..284E.
- ↑ 6.0 6.1 6.2 6.3 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
- ↑ 7.0 7.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 8.0 8.1 Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
- ↑ "del02 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=del02+Tau.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ O'Meara, Stephen James (2016), Deep-Sky Companions: The Caldwell Objects, Cambridge University Press, p. 195, ISBN 978-1107083974, https://books.google.com/books?id=MMfxDAAAQBAJ&pg=PA195.
- ↑ Gebran, M.; Vick, M.; Monier, R.; Fossati, L. (November 2010), "Chemical composition of A and F dwarfs members of the Hyades open cluster", Astronomy and Astrophysics 523: 13, doi:10.1051/0004-6361/200913273, A71, Bibcode: 2010A&A...523A..71G.
- ↑ Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics 475 (2): 677–684, doi:10.1051/0004-6361:20077429, Bibcode: 2007A&A...475..677S.
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