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Orange-hued giant star in the southern constellation of Puppis
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 with an
apparent visual magnitude of +2.95
[2] and is located at a distance of about 182
light-years (56
parsecs ) from
Earth .
[1] 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 .
[8] 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 1,066.0 days (2.9 years) and a low
eccentricity of 0.090.
[7]
The primary component of this system has a
stellar classification of K1 III.
[3] 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 4.49 ± 0.07
mas ,
[13] which, at its estimated distance, equates to a physical radius of about 27 times the
radius of the Sun .
[10] It appears to be rotating slowly, with a
projected rotational velocity of 2.2 km s−1 .
[11] 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 4,500
K ,
[14] giving it the orange hue of a cool,
K-type star .
[15]
References
^
a
b
c
d
e van Leeuwen, F. (November 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 Cousins, A. W. J. (1972), "UBV Photometry of Some Very Bright Stars", Monthly Notes of the Astronomical Society of Southern Africa , 31 : 69,
Bibcode :
1972MNSSA..31...69C
^
a
b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars , vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan,
Bibcode :
1978mcts.book.....H
^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication . Carnegie Institution of Washington.
Bibcode :
1953GCRV..C......0W .
^
Brown, A. G. A. ; et al. (Gaia collaboration) (2021).
"Gaia Early Data Release 3: Summary of the contents and survey properties" .
Astronomy & Astrophysics . 649 : A1.
arXiv :
2012.01533 .
Bibcode :
2021A&A...649A...1G .
doi :
10.1051/0004-6361/202039657 .
S2CID
227254300 . (Erratum:
doi :
10.1051/0004-6361/202039657e ) .
Gaia EDR3 record for this source at
VizieR .
^ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics , 430 : 303–311,
arXiv :
astro-ph/0409683 ,
Bibcode :
2005A&A...430..303C ,
doi :
10.1051/0004-6361:20041440 ,
S2CID
12136256 .
^
a
b Jancart, S.; et al. (October 2005), "Astrometric orbits of SB^9 stars", Astronomy and Astrophysics , 442 (1): 365–380,
arXiv :
astro-ph/0507695 ,
Bibcode :
2005A&A...442..365J ,
doi :
10.1051/0004-6361:20053003 ,
S2CID
15123997
^
a
b Spencer Jones, H. (June 1928), "The orbits of four long-period spectroscopic binaries", Monthly Notices of the Royal Astronomical Society , 88 (8): 644,
Bibcode :
1928MNRAS..88..644S ,
doi :
10.1093/mnras/88.8.644 .
^
a
b
c 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.
^
a
b Lang, Kenneth R. (2006),
Astrophysical formulae , Astronomy and astrophysics library, vol. 1 (3rd ed.),
Birkhäuser ,
ISBN
3-540-29692-1 . The radius (R* ) is given by:
2
⋅
R
∗
=
(
10
−
3
⋅
56
⋅
4.49
)
AU
0.0046491
AU
/
R
⨀
≈
54
⋅
R
⨀
{\displaystyle {\begin{aligned}2\cdot R_{*}&={\frac {(10^{-3}\cdot 56\cdot 4.49)\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 54\cdot R_{\bigodot }\end{aligned}}}
^
a
b Costa, J. M.; et al. (February 2002), "The tidal effects on the lithium abundance of binary systems with giant component", Astronomy and Astrophysics , 382 (3): 1016–1020,
arXiv :
astro-ph/0111539 ,
Bibcode :
2002A&A...382.1016C ,
doi :
10.1051/0004-6361:20011676 ,
S2CID
17024265
^
"* tau Pup" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2012-01-25 .
^ Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics , 431 (2): 773–777,
Bibcode :
2005A&A...431..773R ,
doi :
10.1051/0004-6361:20042039
^ Pérez Martínez, M. Isabel; Schröder, K.-P.; Cuntz, M. (June 2011), "The basal chromospheric Mg II h+k flux of evolved stars: probing the energy dissipation of giant chromospheres",
Monthly Notices of the Royal Astronomical Society , 414 (1): 418–427,
arXiv :
1102.4832 ,
Bibcode :
2011MNRAS.414..418P ,
doi :
10.1111/j.1365-2966.2011.18421.x ,
S2CID
59268230
^
"The Colour of Stars" , Australia Telescope, Outreach and Education , Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from
the original on 2013-12-03, retrieved 2012-01-16
External links