29 Orionis

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 article is about e Orionis. It is not to be confused with ε (epsilon) Orionis.
29 Orionis
Location of 29 Orionis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension 05h 23m 56.82768s[1]
Declination −7° 48′ 29.0332″[1]
Apparent magnitude (V) 4.13[2]
Characteristics
Spectral type G8IIIFe-0.5[3]
U−B color index +0.70[4]
B−V color index +0.96[4]
Astrometry
Radial velocity (Rv)−17.68[5] km/s
Proper motion (μ) RA: −14.82[1] mas/yr
Dec.: −45.02[1] mas/yr
Parallax (π)20.73 ± 0.17[1] mas
Distance157 ± 1 ly
(48.2 ± 0.4 pc)
Absolute magnitude (MV)0.73[6]
Details
Mass2.33[2] M☉
Radius10.36[5] R☉
Luminosity71[2] L☉
Surface gravity (log g)2.44[2] cgs
Temperature4,852[2] K
Metallicity [Fe/H]−0.25[2] dex
Rotational velocity (v sin i)1.1[7] km/s
Other designations
e Ori, 29 Ori, BD−07°1064, GC 6646, HD 35369, HIP 25247, HR 1784, SAO 132067[8]
Database references
SIMBADdata

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]

References
  1. 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
  2. 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.
  3. 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.
  4. 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.
  5. 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
  6. 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
  7. 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
  8. "e Ori". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-19.
  9. 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.
  10. 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.
  11. 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.
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