Star in the constellation Auriga
π Aurigae (center) in optical light Pi Aurigae ,Latinized from π Aurigae, is theBayer designation for a single,[ 11] star in the northernconstellation ofAuriga . Located about one degree north of the 2nd magnitude starBeta Aurigae ,[ 12] naked eye with anapparent visual magnitude of 4.25[ 2] parallax measurements, it is approximately 720light-years (220parsecs ) away from Earth.[ 1] extinction caused byinterstellar gas and dust .[ 6]
Pi Aurigae is anevolved bright giant star with astellar classification of M3 II.[ 4] core the star has expanded to approximately 219 times the size of the Sun.[ 8] slow irregular variable of type LC and its brightness varies from magnitude +4.24 to +4.34.[ 5] Sun's luminosity from its enlargedphotosphere at aneffective temperature of 3,525 K.[ 8]
^a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023)."Gaia Data Release 3. Summary of the content and survey properties" .Astronomy and Astrophysics .674 : A1.arXiv :2208.00211 Bibcode :2023A&A...674A...1G .doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source atVizieR .^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 (1): 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 e McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017-10-01), "Fundamental parameters and infrared excesses of Tycho-Gaia stars",Monthly Notices of the Royal Astronomical Society ,471 (1):770– 791,arXiv :1706.02208 Bibcode :2017MNRAS.471..770M ,doi :10.1093/mnras/stx1433 ISSN 0035-8711 Pi Aurigae's database entry atVizieR .^a b 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 , retrieved2012-08-20 .^ 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
