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Star in the constellation Auriga
π Aurigae (center) in optical light
Pi Aurigae ,
Latinized from π Aurigae, is the
Bayer designation for a single,
[10] red-hued
star in the northern
constellation of
Auriga . Located about one degree north of the 2nd magnitude star
Beta Aurigae ,
[11] Pi Aurigae is visible to the naked eye with an
apparent visual magnitude of 4.25
[2] Based upon
parallax measurements, it is approximately 780
light-years (240
parsecs ) away from Earth.
[1] At that distance, the brightness of the star is diminished by 0.54 in magnitude from
extinction caused by
interstellar gas and dust .
[6]
Pi Aurigae is an
evolved
bright giant star with a
stellar classification of M3 II.
[4] After exhausting the supply of hydrogen at its
core the star has expanded to approximately 127
[1] times the girth of the Sun. It is classified as a
slow irregular variable of type LC and its brightness varies from magnitude +4.24 to +4.34.
[5] On average, the star is radiating 6,493
[12] times the
Sun's luminosity from its enlarged
photosphere at an
effective temperature of 3,388 K.
[8]
References
^
a
b
c
d
e
f
g
h
i
Brown, A. G. A. ; et al. (Gaia collaboration) (August 2018).
"Gaia Data Release 2: Summary of the contents and survey properties" .
Astronomy & Astrophysics . 616 . A1.
arXiv :
1804.09365 .
Bibcode :
2018A&A...616A...1G .
doi :
10.1051/0004-6361/201833051 .
Gaia DR2 record for this source at
VizieR .
^
a
b
c
d 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 .
^ Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal , 104 (1): 275–313,
Bibcode :
1992AJ....104..275E ,
doi :
10.1086/116239 .
^
a
b Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics , 11 : 29,
Bibcode :
1973ARA&A..11...29M ,
doi :
10.1146/annurev.aa.11.090173.000333 .
^
a
b Ruban, E. V.; et al. (September 2006), "Spectrophotometric observations of variable stars", Astronomy Letters , 32 (9): 604–607,
Bibcode :
2006AstL...32..604R ,
doi :
10.1134/S1063773706090052 ,
S2CID
121747360 .
^
a
b Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics , 430 (1): 165–186,
arXiv :
astro-ph/0409579 ,
Bibcode :
2005A&A...430..165F ,
doi :
10.1051/0004-6361:20041272 ,
S2CID
17804304 .
^ 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
d Wu, Yue; et al. (January 2011), "Coudé-feed stellar spectral library - atmospheric parameters", Astronomy and Astrophysics , 525 : A71,
arXiv :
1009.1491 ,
Bibcode :
2011A&A...525A..71W ,
doi :
10.1051/0004-6361/201015014 ,
S2CID
53480665 .
^
"pi. Aur -- Pulsating variable Star" ,
SIMBAD ,
Centre de données astronomiques de Strasbourg , retrieved 2012-08-20 .
^ 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 .
^ O'Meara, Stephen James (2007),
Steve O'Meara's Herschel 400 Observing Guide ,
Cambridge University Press , p. 23,
ISBN
978-0521858939 .
^ McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society , 427 (1): 343–357,
arXiv :
1208.2037 ,
Bibcode :
2012MNRAS.427..343M ,
doi :
10.1111/j.1365-2966.2012.21873.x ,
S2CID
118665352 .
External links