Astronomy:28 Monocerotis

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Short description: Star in the constellation Monoceros
28 Monocerotis
V645MonLightCurve.png
A visual band light curve for V645 Monocerotis, adapted from Stift (1979)[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Monoceros
Right ascension  08h 01m 13.33574s[2]
Declination −01° 23′ 33.3935″[2]
Apparent magnitude (V) 4.69[3]
Characteristics
Spectral type K4III[4]
U−B color index +1.76[5]
B−V color index +1.49[5]
Astrometry
Radial velocity (Rv)+26.70[6] km/s
Proper motion (μ) RA: +67.60[2] mas/yr
Dec.: −76.26[2] mas/yr
Parallax (π)7.25 ± 0.30[2] mas
Distance450 ± 20 ly
(138 ± 6 pc)
Absolute magnitude (MV)−1.00[3]
Details
Mass2.193±0.110[7] M☉
Radius47.69+0.46
−2.21[8] R☉
Luminosity524±42[8] L☉
Surface gravity (log g)1.68[9] cgs
Temperature3,999+96
−19[8] K
Metallicity [Fe/H]−0.26[3] dex
Rotational velocity (v sin i)2.2[10] km/s
Other designations
V645 Mon, BD−00 1882, FK5 2620, GC 10870, HD 65953, HIP 39211, HR 3141, SAO 135380[11]
Database references
SIMBADdata

28 Monocerotis is a single[12] star in the equatorial constellation of Monoceros. It has an orange-hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.69.[3] The distance to this star is approximately 450 light years based on parallax,[2] and it has an absolute magnitude of −1.00.[3] The star is drifting further away from the Sun with a radial velocity of +26.7 km/s.[6]

This is an aging giant star with a stellar classification of K4III,[4] having exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence. The spectrum of the star shows abnormally strong lines of CN.[13] It is classified as an FK Comae Berenices variable, varying by 0.02 magnitude over a period of 0.21 days.[14][1] FK Comae Berenices variables are typically rapidly-rotating stars, but the measured projected rotational velocity of 28 Monocerotis is low.[10] The star has expanded to 48 times the radius of the Sun. It is radiating 524 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,999 K.[8]

Measurement of the star's proper motion anomaly by the Gaia spacecraft suggests a companion may be orbiting the star at a distance of 1.9 astronomical unit|AU.[7]

References

  1. ↑ 1.0 1.1 Stift, M. J. (January 1979). "5-hour Light Variation of HD 65953 (28 Mon)?". Information Bulletin on Variable Stars 1542: 1. Bibcode: 1979IBVS.1542....1S. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.  Vizier catalog entry
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.  Vizier catalog entry
  4. ↑ 4.0 4.1 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey 5. Bibcode: 1999MSS...C05....0H. 
  5. ↑ 5.0 5.1 Mermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie 2168. Bibcode: 2006yCat.2168....0M. Vizier catalog entry
  6. ↑ 6.0 6.1 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G. 
  7. ↑ 7.0 7.1 Kervella, Pierre et al. (March 2019). "Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly". Astronomy & Astrophysics 623: 23. doi:10.1051/0004-6361/201834371. A72. Bibcode: 2019A&A...623A..72K. 
  8. ↑ 8.0 8.1 8.2 8.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  9. ↑ Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics 591: A118. doi:10.1051/0004-6361/201628497. Bibcode: 2016A&A...591A.118S. 
  10. ↑ 10.0 10.1 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. doi:10.1051/0004-6361/201220762. Bibcode: 2014A&A...561A.126D.  Vizier catalog entry
  11. ↑ "28 Mon". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=28+Mon. 
  12. ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 
  13. ↑ Eggen, Olin J. (October 1996). "Star Streams and Galactic Structure". Astronomical Journal 112: 1595. doi:10.1086/118126. Bibcode: 1996AJ....112.1595E. 
  14. ↑ Samus, N. N. et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S 1. Bibcode: 2009yCat....102025S. 



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