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K-type giant star in the constellation Pyxis
Gamma Pyxidis ,
Latinized from γ Pyxidis , is a single,
[10] orange-hued
star in the southern
constellation
Pyxis . It is visible to the naked eye, having an
apparent visual magnitude of 4.010.
[2] Based upon an annual
parallax shift of 15.73
mas as seen from Earth,
[1] it is located about 207
light years from the
Sun . The star is moving further from the Sun with a
radial velocity of +24.5 km/s.
[4]
Properties
This is an
evolved
K-type
giant star with a
stellar classification of K3 III.
[2] It is a
red clump star on the
horizontal branch ,
[11] indicating that it is generating energy through
helium fusion at its
core . The composition of the
stellar atmosphere is similar to the Sun, having roughly the same abundance of iron in its
spectrum .
[12] The star has an estimated 1.64
[2] times the
mass of the Sun and has expanded to nearly 22
[6] times the
Sun's radius . At the age of around four billion years, it is radiating 178
[7] times the
Sun's luminosity from its enlarged
photosphere at an
effective temperature of 4,270 K.
[8]
Gamma Pyxidis is moving through the Galaxy at a speed of 54.2 km/s relative to the Sun. Its projected Galactic orbit carries it between 21,300 and 30,700 light years from the center of the Galaxy.
[13] [
better source needed ]
Naming
In
Chinese , 天狗 (Tiān Gǒu ), meaning
Celestial Dog , refers to an asterism consisting of γ Pyxidis,
e Velorum ,
f Velorum ,
β Pyxidis ,
α Pyxidis and
δ Pyxidis . Consequently, γ Pyxidis itself is known as 天狗六 (Tiān Gǒu liù , English: the Sixth Star of Celestial Dog .)
[14]
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
e
f Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal , 150 (3), 88,
arXiv :
1507.01466 ,
Bibcode :
2015AJ....150...88L ,
doi :
10.1088/0004-6256/150/3/88 ,
S2CID
118505114 .
^
a
b 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 Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters , 32 (11): 759–771,
arXiv :
1606.08053 ,
Bibcode :
2006AstL...32..759G ,
doi :
10.1134/S1063773706110065 ,
S2CID
119231169 .
^ 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 Reffert, Sabine; et al. (2015), "Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity", Astronomy & Astrophysics , 574 : A116,
arXiv :
1412.4634 ,
Bibcode :
2015A&A...574A.116R ,
doi :
10.1051/0004-6361/201322360 ,
hdl :
10722/215277 ,
S2CID
59334290 .
^
a
b Mallik, Sushma V. (December 1999), "Lithium abundance and mass", Astronomy and Astrophysics , 352 : 495–507,
Bibcode :
1999A&A...352..495M
^
a
b
c
d Cenarro, A. J.; et al. (2007), "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters",
Monthly Notices of the Royal Astronomical Society , 374 (2): 664–690,
arXiv :
astro-ph/0611618 ,
Bibcode :
2007MNRAS.374..664C ,
doi :
10.1111/j.1365-2966.2006.11196.x ,
S2CID
119428437
^
"gam Pyx" , SIMBAD ,
Centre de Données astronomiques de Strasbourg , retrieved 2009-06-03
^ 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 .
^ Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal , 539 (2): 732–741,
arXiv :
astro-ph/0003329 ,
Bibcode :
2000ApJ...539..732A ,
doi :
10.1086/309278 ,
S2CID
16673121 .
^ Keenan, Philip C.; Barnbaum, Cecilia (June 1999), "Revision and Calibration of MK Luminosity Classes for Cool Giants by HIPPARCOS Parallaxes", The Astrophysical Journal , 518 (2): 859–865,
Bibcode :
1999ApJ...518..859K ,
doi :
10.1086/307311 ,
S2CID
121902473
^
"Gamma Pyxidis (HIP 43409)" . Archived from
the original on 2014-02-21. Retrieved 2012-08-23 .
^ (in Chinese)
AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 17 日
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