Star in the constellation Draco
Tau Draconis , Latinized from τ Draconis , is an astrometric binary star system in the northern circumpolar constellation of Draco . The star is faintly visible to the naked eye, having an apparent visual magnitude of 4.45. Based upon an annual parallax shift of 22.28 mas as measured from Earth, it is located around 146 light years from the Sun . Its proper motion is propelling it across the sky at the rate of 0.176 arc seconds per year.
This is a K-type giant star with a stellar classification of K2 III:, where the semi-colon indicates some uncertainty about its spectral value. It is considered metal-rich star and is past the first dredge-up phase of its post-main sequence evolution , although it shows under-abundances of carbon and oxygen in its spectrum . The star has 1.25 times the mass of the Sun and is an estimated 6.48 billion years old. It is radiating 48 times the solar luminosity from its enlarged photosphere at an effective temperature of 4,413 K.
References
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^ 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 .
^ Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal , 150 (3): 23, arXiv :1507.01466 , Bibcode :2015AJ....150...88L , doi :10.1088/0004-6256/150/3/88 , S2CID 118505114 , 88.
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^ Mishenina, T. V.; et al. (October 1995), "Chemical composition of five giants with positive CN-indices.", Astronomy and Astrophysics Supplement , 113 : 333, Bibcode :1995A&AS..113..333M .
^ Taylor, B. J. (February 2002), "A statistical search for supermetallicity in F, G and K stars", Monthly Notices of the Royal Astronomical Society , 329 (4): 839–847, Bibcode :2002MNRAS.329..839T , doi :10.1046/j.1365-8711.2002.05046.x .
Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago , 239 (1): 1, Bibcode :1970CoAsi.239....1B .
"tau Dra" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2017-05-30.{{cite web }}: CS1 maint: postscript (link )
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 . S2CID 14878976 .
Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal , 129 (3): 1483–1522, arXiv :astro-ph/0412070 , Bibcode :2005AJ....129.1483L , doi :10.1086/427854 , S2CID 2603568 .
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