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Epsilon Monocerotis

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Binary star system in the constellation Monoceros
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C. | year=2006 }}[http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=II/168/ubvmeans&LID=%2B100044770 Vizier catalog entry]</ref>"},"u-b2":{"wt":"−0.05<ref name=MermiliodUBV/>"},"variable2":{"wt":"<!--Variability type-->"}},"i":3}},"\n",{"template":{"target":{"wt":"Starbox astrometry\n ","href":"./Template:Starbox_astrometry"},"params":{"component1":{"wt":"ε Mon A"},"radial_v":{"wt":"+13.10<ref name=Gontcharov2006>{{Cite journal | doi=10.1134/S1063773706110065 | bibcode=2006AstL...32..759G| title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system| journal=Astronomy Letters| volume=32| issue=11| pages=759–771| year=2006| last1=Gontcharov| first1=G. A.|arxiv = 1606.08053 | s2cid=119231169}}</ref>"},"prop_mo_ra":{"wt":"−15.127<ref name=dr3a/>"},"prop_mo_dec":{"wt":"+7.701<ref name=dr3a/>"},"parallax":{"wt":"24.0777"},"p_error":{"wt":"0.2691"},"parallax_footnote":{"wt":"<ref name=dr3a>{{cite Gaia DR3|3131481481815810432}}</ref>"},"absmag_v":{"wt":"1.52<ref name=XHIPA/>"},"absmag_bol":{"wt":"<!--Absolute bolometric magnitude (accounts for emissions across all spectra of light)-->"},"component2":{"wt":"ε Mon B"},"radial_v2":{"wt":"+12.40<ref name=Gontcharov2006>{{Cite journal | doi=10.1134/S1063773706110065 | bibcode=2006AstL...32..759G| title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system| journal=Astronomy Letters| volume=32| issue=11| pages=759–771| year=2006| last1=Gontcharov| first1=G. 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ε Monocerotis
Location of ε Monocerotis (circled red)
Observation data
Epoch J2000Equinox ICRS
Constellation Monoceros
ε Mon A
Right ascension 06h 23m 46.08471s[1]
Declination 4°35′34.3153′′[1]
Apparentmagnitude(V) 4.39[2]
ε Mon B
Right ascension 06h 23m 46.48292s[3]
Declination 4°35′45.2307′′[3]
Apparentmagnitude(V) 6.72[4]
Characteristics
ε Mon A
Evolutionarystage main sequence [5]
Spectraltype A5IV[6]
U−B color index +0.14[7]
B−V color index +0.20[7]
ε Mon B
Evolutionarystage main sequence [3]
Spectraltype F5V[6]
U−B color index −0.05[8]
B−V color index +0.45[8]
Astrometry
ε Mon A
Radial velocity (Rv)+13.10[9] km/s
Proper motion (μ) RA:−15.127[1] mas/yr
Dec.:+7.701[1] mas/yr
Parallax (π)24.0777±0.2691mas [1]
Distance 135 ± 2ly
(41.5 ± 0.5pc)
Absolutemagnitude(MV)1.52[2]
ε Mon B
Radial velocity (Rv)+12.40[9] km/s
Proper motion (μ) RA:−18.845[3] mas/yr
Dec.:+0.658[3] mas/yr
Parallax (π)25.0633±0.0219mas [3]
Distance 130.1 ± 0.1ly
(39.90 ± 0.03pc)
Absolutemagnitude(MV)+3.88[4]
Details
ε Mon A
Mass 2.04[5] M☉
Radius 2.5[10] R☉
Luminosity 25[5] L☉
Surface gravity (logg)3.95[11] cgs
Temperature 7,923[11] K
Metallicity [Fe/H]−0.11[12] dex
Rotational velocity (vsini)149[5] km/s
ε Mon B
Mass 1.16[10] M☉
Radius 1.1[10] R☉
Luminosity2.39[4] L☉
Surface gravity (logg)3.95[11] cgs
Temperature 7,923[11] K
Rotational velocity (vsini)25[6] km/s
Other designations
εMon, 8Monocerotis, CCDM J06237+0436, WDS J06238+0436
ε Mon A: BD+04°1236, FK5 244, GC 8240, HD 44769, HIP 30419, HR 2298, SAO 113810
ε Mon B: BD+04°1237, FK5 244, GC 8241, HD 44770, HIP 30422, HR 2299, SAO 113811
Database references
SIMBAD A
B

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.[13]

The white-hued primary component has a stellar classification of A5 IV,[6] suggesting it is an aging subgiant star. Its apparent magnitude is 4.39[2] and it is approximately 135 light years away based on parallax. It is reportedly a spectroscopic binary with a period around 331 days.[14]

The B component, at a separation of around 12.3",[14] is a yellow-white hued F-type main-sequence star of class F5 V[6] and an apparent magnitude of 6.72.[4]

References

[edit ]
  1. 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211 . Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940 . S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. 1 2 3 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 A
  3. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211 . Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940 . S2CID 244398875. Gaia DR3 record for this source at VizieR.
  4. 1 2 3 4 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
  5. 1 2 3 4 Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052 . Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. S2CID 55586789. Vizier catalog entry
  6. 1 2 3 4 5 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.
  7. 1 2 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
  8. 1 2 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
  9. 1 2 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  10. 1 2 3 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.
  11. 1 2 3 4 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. arXiv:1501.03154 . Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. S2CID 33401607.
  12. ↑ 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.
  13. ↑ Kaler, James. "EPS MON (Epsilon Monocerotis)". STARS. University of Illinois. Retrieved 2017年12月23日.
  14. 1 2 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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