19 Monocerotis

19 Monocerotis is a single,[12] variable star[4] in the equatorial constellation of Monoceros, located approximately 1,220 light years away from the Sun based on parallax.[1] It has the variable star designation V637 Monocerotis, while 19 Monocerotis is the Flamsteed designation. This object is visible to the naked eye as a faint, blue-white hued star with a baseline apparent visual magnitude of 5.00.[2] It is receding from the Earth with a heliocentric radial velocity of +25 km/s.[5]

19 Monocerotis
Location of 19 Monocerotis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Monoceros
Right ascension  07h 02m 54.77667s[1]
Declination −04° 14′ 21.2377″[1]
Apparent magnitude (V) 5.00[2]
Characteristics
Spectral type B1V[3]
U−B color index −0.93[2]
B−V color index −0.20[2]
Variable type β Cep[4]
Astrometry
Radial velocity (Rv)+24.80[5] km/s
Proper motion (μ) RA: −5.05[1] mas/yr
Dec.: +2.24[1] mas/yr
Parallax (π)2.68 ± 0.22[1] mas
Distance1,220 ± 100 ly
(370 ± 30 pc)
Absolute magnitude (MV)−2.85[6]
Details
Mass12.3[7] M☉
Radius9±3[8] R☉
Luminosity4,817[6] L☉
Surface gravity (log g)3.662[9] cgs
Temperature25,400[10] K
Rotational velocity (v sin i)274±3[8] km/s
Other designations
19 Mon, V637 Mon, BD−04°1788, FK5 2547, GC 9293, HD 52918, HIP 33971, HR 2648, SAO 134106[11]
Database references
SIMBADdata

This massive, B-type main-sequence star has a stellar classification of B1 V.[3] It is a Beta Cephei variable, ranging from 5.01 to 4.96 magnitude with a period of 0.19 days.[4] Closer examination shows there are three frequencies present, consisting of 5.22994, 0.17017, and 4.88956 cycles per day.[8] At one point it was thought to be a marginal Be star, but this was not confirmed.[8] The star is spinning rapidly with a projected rotational velocity of 274 km/s.[8] It has 12.3[7] times the mass of the Sun and is radiating 4,817[6] times the Sun's luminosity from its photosphere at an effective temperature of 25,400 K.[10]

References
  1. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 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. 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. Samus, N. N.; Durlevich, O. V.; 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....1.2025S.
  5. Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W. LCCN 54001336.
  6. 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. Vizier catalog entry
  7. Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410: 190. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. Vizier catalog entry
  8. Balona, L. A.; et al. (July 2002). "Short-period line profile and light variations in the Beta Cephei star 19 Monocerotis" (PDF). Monthly Notices of the Royal Astronomical Society. 333 (4): 952–960. Bibcode:2002MNRAS.333..952B. doi:10.1046/j.1365-8711.2002.05487.x.
  9. Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv:1605.07384. Bibcode:2016A&A...591A.118S. doi:10.1051/0004-6361/201628497.
  10. Hohle, M.M.; Neuhäuser, R.; Schutz, B.F. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349. arXiv:1003.2335. Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. Vizier catalog entry
  11. "19 Mon". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-30.
  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. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
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