Tau Puppis
Template:Short description Template:Starbox begin Template:Starbox image Template:Starbox observe Template:Starbox character Template:Starbox astrometry Template:Starbox orbit Template:Starbox detail Template:Starbox catalog Template:Starbox reference Template:Starbox end
Tau Puppis, Latinized from τ Puppis, is a star in the southern constellation of Puppis, near the southern constellation boundary with Carina. It is visible to the naked eye with an apparent visual magnitude of +2.95[1] and is located at a distance of about Template:Convert from Earth.[2] The variable radial velocity of this system was detected by H. D. Curtis and H. K. Palmer in 1908, based on observations made at the D. O. Mills Observatory.[3] It is a spectroscopic binary star system, with the presence of the secondary component being revealed by the shifts of absorption lines in the spectrum resulting from the Doppler effect. The two components orbit each other with a period of Template:Convert and a low eccentricity of 0.090.[4]
The primary component of this system has a stellar classification of K1 III.[5] A luminosity class 'III' indicates this has expanded into a giant star after exhausting the supply of hydrogen at its core and evolving away from the main sequence of stars like the Sun. The interferometry-measured angular diameter of this star, after correcting for limb darkening, is Template:Nowrap,[6] which, at its estimated distance, equates to a physical radius of about 27 times the radius of the Sun.[7] It appears to be rotating slowly, with a projected rotational velocity of Template:Nowrap.[8] This gives a lower bound on the azimuthal velocity of rotation along the star's equator. Tau Puppis is radiating energy from its outer envelope at an effective temperature of around Template:Val,[9] giving it the orange hue of a cool, K-type star.[10]
This star had the traditional Arabic name Bulqayn or Balqīn (Template:Lang), the meaning of which is unknown. It was described along with the neighboring bright star Suhayl (Canopus).[11]
References
- ↑ Template:Citation Cite error:
<ref>tag with name "Luck2015" defined in<references>is not used in prior text. - ↑ Template:Citation Cite error:
<ref>tag with name "Cardini2005" defined in<references>is not used in prior text. - ↑ Template:Cite journal Cite error:
<ref>tag with name "gcrv1953" defined in<references>is not used in prior text. - ↑ Template:Cite simbad Cite error:
<ref>tag with name "SIMBAD" defined in<references>is not used in prior text. - ↑ Template:Citation
- ↑ Template:Citation
- ↑ Template:Citation
- ↑ Template:Citation
- ↑ Template:Citation
- ↑ Template:Citation
- ↑ Template:Citation. The radius (R*) is given by:
- ↑ Template:Citation
- ↑ Template:Citation
- ↑ Template:Citation
- ↑ Template:Cite thesis