Astronomy:Tau2 Serpentis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Serpens |
| Right ascension | 15h 32m 09.67495s[1] |
| Declination | +16° 03′ 22.2056″[1] |
| Apparent magnitude (V) | 6.22[2] |
| Characteristics | |
| Spectral type | B9V[3] |
| U−B color index | −0.23[4] |
| B−V color index | −0.038±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | −19.3±2.7[2] km/s |
| Proper motion (μ) | RA: −2.92[5] mas/yr Dec.: +6.48[5] mas/yr |
| Parallax (π) | 6.7936 ± 0.0928[1] mas |
| Distance | 480 ± 7 ly (147 ± 2 pc) |
| Absolute magnitude (MV) | +0.44[2] |
| Details | |
| Mass | 2.89±0.08[6] M☉ |
| Radius | 2.7[7] R☉ |
| Luminosity | 96.4+15.3 −12.6[6] L☉ |
| Temperature | 10,839+60 −50[6] K |
| Rotational velocity (v sin i) | 154[6] km/s |
| Age | 278[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Tau2 Serpentis, Latinized from τ2 Serpentis, is a star in the constellation of Serpens, located approximately 480 light-years from the Sun.[1] It is a challenge to view with the naked eye, having an apparent visual magnitude of 6.22.[2] The star is drifting closer with a radial velocity of −19 km/s.[2]
This object is a late B-type main-sequence star with a stellar classification of B9V.[3] It is a probable Lambda Boötis star.[2][10] The star is 278[8] million years old and is spinning with a projected rotational velocity of 154 km/s.[6] It has nearly three times the mass and radius of the Sun.[6][7] Tau2 Serpentis is radiating 96[6] times the Sun's luminosity from its photosphere at an effective temperature of 10,839 K.[6]
There is evidence of a possible companion, which is contributing about 15% to the total emission of the system.[11]
References
- ↑ 1.0 1.1 1.2 1.3 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 2.4 2.5 2.6 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 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.
- ↑ Hoffleit, D.; Warren, Jr., W. H., The Bright Star Catalogue (5th Revised ed.), CDS. HR 5770. Accessed on line September 19, 2008.
- ↑ 5.0 5.1 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.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 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.
- ↑ 7.0 7.1 Pasinetti Fracassini, L. E. et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy & Astrophysics 367 (2): 521–24, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P. HD 138527 Accessed on line September 19, 2008.
- ↑ 8.0 8.1 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.
- ↑ "tau02 Ser". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=tau02+Ser.
- ↑ Murphy, Simon J. et al. (October 2015), "An Evaluation of the Membership Probability of 212 λ Boo Stars. I. A Catalogue", Publications of the Astronomical Society of Australia 32: 43, doi:10.1017/pasa.2015.34, e036, Bibcode: 2015PASA...32...36M
- ↑ Zverko, J. et al. (January 2013), "Stars with discrepant v sin i as derived from Ca II λ 3933 Å and Mg II λ 4481 Å lines. III. Stars with v sin i ( λ 3933 Å) < v sin i ( λ 4481 Å)", Astrophysical Bulletin 68 (1): 57–77, doi:10.1134/S1990341313010069, Bibcode: 2013AstBu..68...57Z.
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