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15 Orionis
Location of 15 Orionis (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Orion
Right ascension 05h 09m 41.96481s [1]
Declination 15° 35′ 49.9051″ [1]
Apparent magnitude (V) 4.82 [2]
Characteristics
Spectral type F2IV [3]
U−B color index +0.19 [2]
B−V color index +0.32 [2]
Astrometry
Radial velocity (Rv)+28.79 [4] km/s
Proper motion (μ) RA: −3.105 [1]  mas/ yr
Dec.: –3.444 [1]  mas/ yr
Parallax (π)9.5097 ± 0.2951  mas [1]
Distance340 ± 10  ly
(105 ± 3  pc)
Absolute magnitude (MV)−0.04 [5]
Details
15 Ori A
Mass3.42±0.67 [6]  M☉
Radius5.9 [7]  R☉
Luminosity300 [6]  L☉
Surface gravity (log g)3.75 [8]  cgs
Temperature7,161+50
−49 [6]  K
Metallicity [Fe/H]+0.21 [8]  dex
Rotational velocity (v sin i)60 [6] km/s
Other designations
15 Ori, BD+15°752, GC 6306, HD 33276, HIP 24010, HR 1676, SAO 94359, CCDM J05097+1536AB, WDS J05097+1536AB
Database references
SIMBAD data

15 Orionis is a suspected astrometric binary [9] star system in the equatorial constellation of Orion, near the border with Taurus. It is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of 4.82. [2] The system is approximately 340  light years away from the Sun based on parallax. It is moving further from the Earth with a heliocentric radial velocity of +29 km/s, [4] having come to within 69 light-years some three million years ago. [5]

The primary component is an early F-type subgiant star with a stellar classification of F2 IV, [3] a star that has exhausted the hydrogen at its core and has begun to evolve into a giant. It has 3.42 [6] times the mass of the Sun and 5.9 [7] times the Sun's radius. The star still has a relatively high rotation rate, showing a projected rotational velocity of 60 km/s. [6] It is radiating 300 times the luminosity of the Sun from its expanding photosphere at an effective temperature of 7,161 K. [6]

It has one suspected companion, component B, at a separation of 0.3". [10]

References

  1. ^ a b c d e 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.
  2. ^ a b c d 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.
  3. ^ 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.
  4. ^ a b Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey (2008). "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity". The Astronomical Journal. 135 (1): 209–231. Bibcode: 2008AJ....135..209M. doi: 10.1088/0004-6256/135/1/209. S2CID  121883397.
  5. ^ a b 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. Vizier catalog entry
  6. ^ a b c d e f g Zorec, J.; Royer, F.; Asplund, Martin; Cassisi, Santi; Ramirez, Ivan; Melendez, Jorge; Bensby, Thomas; Feltzing, Sofia (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv: 1201.2052. Bibcode: 2012A&A...537A.120Z. doi: 10.1051/0004-6361/201117691. S2CID  55586789.
  7. ^ a b Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv: astro-ph/9911002. Bibcode: 1999A&A...352..555A. Vizier catalog entry
  8. ^ a b Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv: 1009.1491. Bibcode: 2011A&A...525A..71W. doi: 10.1051/0004-6361/201015014. S2CID  53480665.
  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. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode: 2001AJ....122.3466M. doi: 10.1086/323920. Vizier catalog entry
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