Theta Volantis
| |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Volans |
| Right ascension | 08h 39m 05.16145s[1] |
| Declination | −70° 23′ 12.2826″[1] |
| Apparent magnitude (V) | 5.19[2] |
| Characteristics | |
| Spectral type | A0 V[3] |
| U−B color index | −0.03[4] |
| B−V color index | +0.01[4] |
| Astrometry | |
| Radial velocity (Rv) | 13.00±4.2[2] km/s |
| Proper motion (μ) | RA: +19.15[1] mas/yr Dec.: −38.28[1] mas/yr |
| Parallax (π) | 13.58 ± 0.20[1] mas |
| Distance | 240 ± 4 ly (74 ± 1 pc) |
| Details | |
| Mass | 2.3[5] M☉ |
| Luminosity | 37[6] L☉ |
| Surface gravity (log g) | 4.08[5] cgs |
| Temperature | 8,753[6] K |
| Rotational velocity (v sin i) | 98[5] km/s |
| Age | 185−364[5] Myr |
| Other designations | |
Theta Volantis (θ Vol, θ Volantis) is a solitary[8][9] star in the southern constellation of Volans. Based upon parallax measurements, is approximately 240 light years from the Sun. It has an apparent visual magnitude of 5.19,[2] which is bright enough to be faintly visible to the naked eye.
Theta Volantis is a A-type main sequence star with a stellar classification of A0 V[3] and a mass around 2.3 times that of the Sun. It is a young star with an estimated age of a few hundred million years, and is spinning rapidly with a projected rotational velocity of 98 km/s.[5] Theta Volantis shines 37 times as brightly as the Sun, with an effective temperature of 8,753 K in its outer atmosphere.[6]
The star has two optical companions: a magnitude 15.0 star at an angular separation of 22.10″ along a position angle of 58°, and a magnitude 10.64 star at an angular separation of 41.3″ along a position angle of 105° (both as of 2000).[10]
References
- 1 2 3 4 5 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. - 1 2 3 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, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
- 1 2 Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
- 1 2 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data, SIMBAD, Bibcode:1986EgUBV........0M.
- 1 2 3 4 5 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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
- 1 2 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, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
- ↑ "tet Vol -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-09-05.
- ↑ 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.
- ↑ De Rosa, R. J.; et al. (2013), "The VAST Survey - III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society, 437 (2): 1216, arXiv:1311.7141, Bibcode:2014MNRAS.437.1216D, doi:10.1093/mnras/stt1932.
- ↑ Mason, B. D.; et al. (2014), The Washington Visual Double Star Catalog, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.