Aging giant star in the constellation of Orion
29 Orionis is a single[ 9] star located around 157[ 1] light years away from the Sun in the equatorial constellation of Orion . In Bayer's Uranometria , this star is one of two stars (the other being Upsilon Orionis ) marking the top of Orion's right boot.[ 10] It has the Bayer designation e Orionis , while 29 Orionis is the Flamsteed designation . This object is visible to the naked eye as a faint, yellow-hued point of light with an apparent visual magnitude of 4.13.[ 2] It is moving closer to the Earth with a heliocentric radial velocity of -18 km/s.[ 5]
This is an aging giant star with a stellar classification of G8IIIFe-0.5,[ 3] having exhausted the supply of hydrogen at its core and evolved away from the main sequence . The suffix notation indicates a mild underabundance of iron in the spectrum . It is a red clump giant,[ 11] which means it is on the horizontal branch and is generating energy through helium fusion at its core. The star has 2.33[ 2] times the mass of the Sun and has expanded to 10.36[ 5] times the Sun's radius . It is radiating 71 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,852 K.[ 2]
^ 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 . Vizier catalog entry
^ a b c d e f g h i Takeda, Yoichi; Sato, Bun'ei; Murata, Daisuke (2008). "Stellar Parameters and Elemental Abundances of Late-G Giants". Publications of the Astronomical Society of Japan . 60 (4): 781–802. arXiv :0805.2434 . Bibcode :2008PASJ...60..781T . doi :10.1093/pasj/60.4.781 . S2CID 16258166 .
^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H . 5050 . Bibcode :1995yCat.5050....0H .
^ a b Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues . 2237 . Bibcode :2002yCat.2237....0D .
^ a b c d Jofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; Artur de la Villarmois, E.; Chavero, C.; Gómez, M.; Mauas, P. J. D. (2015). "Stellar parameters and chemical abundances of 223 evolved stars with and without planets". Astronomy & Astrophysics . 574 : A50. arXiv :1410.6422 . Bibcode :2015A&A...574A..50J . doi :10.1051/0004-6361/201424474 . S2CID 53666931 . Vizier catalog entry
^ Da Silva, Ronaldo; Milone, André de C.; Rocha-Pinto, Helio J. (2015). "Homogeneous abundance analysis of FGK dwarf, subgiant, and giant stars with and without giant planets". Astronomy & Astrophysics . 580 : A24. arXiv :1505.01726 . Bibcode :2015A&A...580A..24D . doi :10.1051/0004-6361/201525770 . S2CID 119216425 . Vizier catalog entry
^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics . 561 : A126. arXiv :1312.3474 . Bibcode :2014A&A...561A.126D . doi :10.1051/0004-6361/201220762 . S2CID 54046583 . Vizier catalog entry
^ "e Ori" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-06-19 .
^ 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 .
^ Wagman, Morton (2003). Lost Stars: Lost, Missing and Troublesome Stars from the Catalogues of Johannes Bayer, Nicholas Louis de Lacaille, John Flamsteed, and Sundry Others . Blacksburg, VA : The McDonald & Woodward Publishing Company. p. 513. ISBN 978-0-939923-78-6 .
^ 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 .