Star in the constellation Aries
19 Arietis (abbreviated 19 Ari ) is a star in the northern constellation of Aries . 19 Arietis is the Flamsteed designation . It has an apparent visual magnitude of 5.70, which means it is faintly visible to the naked eye. Based upon an annual parallax shift of 6.81 mas , it is approximately 480 light-years (150 parsecs ) away from Earth. At that distance, the brightness of the star is diminished by 0.21 in magnitude from extinction caused by interstellar gas and dust .
This is a red giant star with a stellar classification of M0 III. It is a semi-regular variable with periods of 32 and 275 days; the brightness of the star changes by an amplitude of 0.14 in magnitude during those intervals. 19 Arietis has expanded to 39 times the size of the Sun, its photosphere radiates 300 times the luminosity of the Sun . The effective temperature of the outer envelope is 3,838 K, giving it the cool reddish glow of an M-type star .
References
^ 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 .
^ 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 .
^ 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 .
^ Yeşilyaprak, C.; Aslan, Z. (2007), "Period-luminosity relation for M-type semiregular variables from Hipparcos parallaxes", Monthly Notices of the Royal Astronomical Society , 355 (2): 601–607, arXiv :0704.3150 , Bibcode :2004MNRAS.355..601Y , doi :10.1111/j.1365-2966.2004.08344.x .
^ 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 .
^ 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 : 770–791, arXiv :1706.02208 , doi :10.1093/mnras/stx1433 , ISSN 0035-8711 19 Arietis' database entry at VizieR .
Taylor, B. J. (February 1999), "Catalogs of temperatures and averages for evolved G and K stars", Astronomy and Astrophysics Supplement , 134 (3): 523–524, Bibcode :1999A&AS..134..523T , doi :10.1051/aas:1999153 .
"19 Ari" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2012-07-18."The Colour of Stars" , Australia Telescope, Outreach and Education , Commonwealth Scientific and Industrial Research Organisation , December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-01-16
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