Tau Librae
Star in the constellation Libra
Tau Librae , Latinized from τ Librae, is the Bayer designation for a binary star system at the southern edge of the zodiac constellation of Libra . It can be seen with the naked eye, having an apparent visual magnitude of 3.68.[ 2] The distance to this system is around 367 light years , as determined from an annual parallax shift of 8.89 mas .[ 1]
Judging by its motion through space and physical properties, this system is a member of the Upper Centaurus–Lupus group of the Scorpius–Centaurus association .[ 4] It is double-lined[ 12] spectroscopic binary with an orbital period of just 3.3 days and an eccentricity of 0.28.[ 6] The primary, component A, is a B-type main sequence star with a stellar classification of B2.5 V.[ 3] It is estimated to hold more than seven[ 7] times the mass of the Sun and have over three[ 8] times the Sun's radius . It is only 31.5[ 10] million years old and is spinning relatively rapidly with a projected rotational velocity of 134 km/s.[ 4] It is a heartbeat star system, with pulsations caused by tidal forces.[ 13]
The system is emitting an infrared excess , suggesting the presence of a circumstellar disk of material.[ 9]
References
^ a b c d e f 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 (June 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.; Garrison, R. F.; Schild, R. E. (July 1969), "MK Spectral Types for Bright Southern OB Stars", Astrophysical Journal , 157 : 313–326, Bibcode :1969ApJ...157..313H , doi :10.1086/150069 .
^ a b c d Jilinski, E.; et al. (March 2006), "Radial velocity measurements of B stars in the Scorpius–Centaurus association", Astronomy and Astrophysics , 448 (3): 1001–1006, arXiv :astro-ph/0601643 , Bibcode :2006A&A...448.1001J , doi :10.1051/0004-6361:20041614 , S2CID 17818058 .
^ 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 Pourbaix, D.; et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy and Astrophysics , 424 (2): 727–732, arXiv :astro-ph/0406573 , Bibcode :2004A&A...424..727P , doi :10.1051/0004-6361:20041213 , S2CID 119387088 .
^ a b c Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten , 331 (4): 349, arXiv :1003.2335 , Bibcode :2010AN....331..349H , doi :10.1002/asna.200911355 , S2CID 111387483 .
^ a b Pasinetti-Fracassini, L. E.; et al. (February 2001), "Catalog 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 d Saffe, C.; Gómez, M.; Pintado, O.; González, E. (October 2008), "Spectroscopic metallicities of Vega-like stars", Astronomy and Astrophysics , 490 (1): 297–305, arXiv :0805.3936 , Bibcode :2008A&A...490..297S , doi :10.1051/0004-6361:200810260 , S2CID 15059920 .
^ a b Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (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 .
^ "tau Lib" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2017-01-30 .{{cite web }}
: CS1 maint: postscript (link )
^ Strom, Stephen E.; et al. (February 2005), "B Star Rotational Velocities in h and χ Persei: A Probe of Initial Conditions during the Star Formation Epoch?", The Astronomical Journal , 129 (2): 809–828, arXiv :astro-ph/0410337 , Bibcode :2005AJ....129..809S , doi :10.1086/426748 , S2CID 15059129 .
^ Sharma, Awshesh N.; Bedding, Timothy R.; Saio, Hideyuki; White, Timothy R. (2022). "Pulsating B stars in the Scorpius–Centaurus Association with TESS" . Monthly Notices of the Royal Astronomical Society . 515 (1): 828–840. arXiv :2203.02582 . Bibcode :2022MNRAS.515..828S . doi :10.1093/mnras/stac1816 .
External links
Kaler, James B. (May 17, 2013), "Tau Librae" , Stars , University of Illinois, retrieved 2017-02-02 .