Theta Lupi
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Lupus |
Right ascension | 16h 06m 35.54525s[1] |
Declination | −36° 48′ 08.2653″[1] |
Apparent magnitude (V) | 4.22[2] |
Characteristics | |
Spectral type | B2.5 Vn[3] |
U−B color index | −0.734[2] |
B−V color index | −0.184[2] |
Astrometry | |
Radial velocity (Rv) | +6.0±3.4[4] km/s |
Proper motion ( | RA: −15.33[1] mas/yr Dec.: −33.83[1] mas/yr |
Parallax ( | 7.87 ± 0.47 mas[1] |
Distance | 410 ± 20 ly (127 ± 8 pc) |
Absolute magnitude (MV) | −1.29[5] |
Details | |
Mass | 6.5±0.1[6] M☉ |
Radius | 4.5[7] R☉ |
Luminosity | 792[8] L☉ |
Surface gravity (log g) | 4.5[9] cgs |
Temperature | 15,395[8] K |
Rotational velocity (v sin i) | 331[10] km/s |
Age | 24.6±5.2[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Theta Lupi, Latinized from
This is a B-type main sequence star with a stellar classification of B2.5 Vn,[3] where the 'n' suffix indicates nebulous lines due to spin. It is rotating rapidly with a projected rotational velocity of 331 km/s.[10] This is giving the star an oblate shape with an equatorial bulge that is an estimated 15% larger than the polar radius.[15] The star has an estimated 6.5[6] times the mass of the Sun and around 4.5[7] times the Sun's radius. With an age of just 24.6[6] million years, it is radiating 792 times the solar luminosity from its outer atmosphere at an effective temperature of 15,395 K.[8]
References
[edit]- ^ a b c d e 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.
- ^ a b c d Gutierrez-Moreno, Adelina; Moreno, Hugo (1968), "A Photometric Investigation of the Scorpio-Centaurus Association", Astrophysical Journal Supplement, 15: 459, Bibcode:1968ApJS...15..459G, doi:10.1086/190168.
- ^ a b Hiltner, W. A.; et al. (July 1969), "MK Spectral Types for Bright Southern OB Stars", Astrophysical Journal, 157: 313–326, Bibcode:1969ApJ...157..313H, doi:10.1086/150069.
- ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ 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.
- ^ a b c d Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
- ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (3rd ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ a b c 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.
- ^ Gullikson, Kevin; et al. (August 2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 13, arXiv:1604.06456, Bibcode:2016AJ....152...40G, doi:10.3847/0004-6256/152/2/40, S2CID 119179065, 40.
- ^ a b Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory, University of Kyoto, Bibcode:1970crvs.book.....U.
- ^ "tet Lup -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-03-03.
- ^ a b Rizzuto, A. C.; et al. (December 2013), "Long-baseline interferometric multiplicity survey of the Sco-Cen OB association", Monthly Notices of the Royal Astronomical Society, 436 (2): 1694–1707, arXiv:1309.3811, Bibcode:2013MNRAS.436.1694R, doi:10.1093/mnras/stt1690.
- ^ Bakich, Michael E. (2010), 1,001 Celestial Wonders to See Before You Die: The Best Sky Objects for Star Gazers, The Patrick Moore Practical Astronomy Series, Springer Science & Business Media, p. 191, ISBN 978-1441917775.
- ^ Bobylev, V. V.; Bajkova, A. T. (August 2013), "Galactic kinematics from a sample of young massive stars", Astronomy Letters, 39 (8): 532–549, arXiv:1307.1677, Bibcode:2013AstL...39..532B, doi:10.1134/S106377371308001X, S2CID 118568203.
- ^ Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
External links
[edit]- Kaler, James B. (July 12, 2013), "Theta Lupi", Stars, University of Illinois, retrieved 2017-03-05.