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19 Monocerotis

Star in the constellation Monoceros

Star in the constellation Monoceros

| b-v = −0.20 | u-b = −0.93

19 Monocerotis is a single, variable star in the equatorial constellation of Monoceros, located approximately 1,220 light years away from the Sun based on parallax. 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. It is receding from the Earth with a heliocentric radial velocity of +25 km/s.

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

References

References

  1. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics.
  2. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues.
  3. (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.
  4. Wilson, R. E.. (1953). "General Catalogue of Stellar Radial Velocities". [[Carnegie Institution of Washington]].
  5. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters.
  6. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society.
  7. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten.
  8. (July 2002). "Short-period line profile and light variations in the Beta Cephei star 19 Monocerotis". Monthly Notices of the Royal Astronomical Society.
  9. (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics.
  10. "19 Mon".
  11. (September 2008). "A catalogue of multiplicity among bright stellar systems". [[Monthly Notices of the Royal Astronomical Society]].
  12. (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.
  13. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute.
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