Astronomy:Epsilon Monocerotis

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Short description: Binary star system in the constellation Monoceros
ε Monocerotis
Monoceros constellation map.svg
Red circle.svg
Location of ε Monocerotis (circled red)
Observation data
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}}
Constellation Monoceros
ε Mon A
Right ascension  06h 23m 46.08471s[1]
Declination 4° 35′ 34.3153″[1]
Apparent magnitude (V) 4.39[2]
ε Mon B
Right ascension  06h 23m 46.48292s[1]
Declination 4° 35′ 45.2307″[1]
Apparent magnitude (V) 6.72[2]
Characteristics
ε Mon A
Spectral type class = A5 IV[3]
U−B color index +0.14[4]
B−V color index +0.20[4]
ε Mon B
Spectral type F5 V[3]
U−B color index −0.05[5]
B−V color index +0.45[5]
Astrometry
ε Mon A
Radial velocity (Rv)+13.10[6] km/s
Proper motion (μ) RA: −22.06[1] mas/yr
Dec.: +10.91[1] mas/yr
Parallax (π)26.67 ± 0.90[1] mas
Distance122 ± 4 ly
(37 ± 1 pc)
Absolute magnitude (MV)1.52[2]
ε Mon B
Radial velocity (Rv)+12.40[6] km/s
Proper motion (μ) RA: −21.86[1] mas/yr
Dec.: +11.35[1] mas/yr
Parallax (π)26.95 ± 0.99[1] mas
Distance121 ± 4 ly
(37 ± 1 pc)
Absolute magnitude (MV)+3.88[2]
Details
ε Mon A
Mass2.04[7] M☉
Radius2.5[8] R☉
Luminosity25[7] L☉
Surface gravity (log g)3.95[9] cgs
Temperature7,923[9] K
Metallicity [Fe/H]−0.11[10] dex
Rotational velocity (v sin i)149[7] km/s
ε Mon B
Mass1.16[8] M☉
Radius1.1[8] R☉
Luminosity2.39[2] L☉
Surface gravity (log g)3.95[9] cgs
Temperature7,923[9] K
Rotational velocity (v sin i)25[3] km/s
Other designations
ε Mon A: {{{names1}}}
ε Mon B: {{{names2}}}
Database references
SIMBADdata
SIMBADdata

ε Monocerotis, Latinised as Epsilon Monocerotis, is the Bayer designation of a binary star system in the equatorial constellation Monoceros. Its location is a guide for sky navigation toward the Rosette Nebula.[11]

The white-hued primary component has a stellar classification of A5 IV,[3] suggesting it is an aging subgiant star. Its apparent magnitude is 4.39[2] and it is approximately 122 light years away based on parallax.[1] It is reportedly a spectroscopic binary with a period around 331 days.[12]

The B component, at a separation of around 12.3",[12] is a yellow-white hued F-type main-sequence star of class F5 V[3] and an apparent magnitude of 6.72.[2]

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 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 A Vizier catalog entry B
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 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 A Vizier catalog entry B
  3. ↑ 3.0 3.1 3.2 3.3 3.4 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. ↑ 4.0 4.1 Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers 42 (2): 443. Bibcode: 2014JAVSO..42..443M. Vizier catalog entry
  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 7.2 Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z.  Vizier catalog entry
  8. ↑ 8.0 8.1 8.2 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. Bibcode: 1999A&A...352..555A. 
  9. ↑ 9.0 9.1 9.2 9.3 David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal 804 (2): 146. doi:10.1088/0004-637X/804/2/146. Bibcode: 2015ApJ...804..146D. 
  10. ↑ Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics 525: A71. doi:10.1051/0004-6361/201015014. Bibcode: 2011A&A...525A..71W. 
  11. ↑ Kaler, James. "EPS MON (Epsilon Monocerotis)". STARS. University of Illinois. http://stars.astro.illinois.edu/sow/epsmon.html. Retrieved 2017-12-23. 
  12. ↑ 12.0 12.1 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. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M.  Vizier catalog entry



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