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18 Monocerotis

Star in the constellation Monoceros

Star in the constellation Monoceros

| b-v = +1.11 | u-b = +1.04

18 Monocerotis is a binary star system located about halfway from Orion's Belt to Procyon, in the equatorial constellation of Monoceros. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.47, and is positioned around 370 light years away from the Sun based on parallax. The system is receding from the Earth with a heliocentric radial velocity of +11 km/s.

It is reported as a single-lined spectroscopic binary with an orbital period of 1760.9 days and an eccentricity of 0.4. The visible component is an aging K-type giant star with a stellar classification of K0+IIIaBa0.2, showing a slight overabundance of barium. The spectrum displays strong violet lines of CN. With the supply of hydrogen at its core exhausted, this star has expanded to 27 times the radius of the Sun. It is radiating 311 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,750 K.

References

References

  1. {{cite DR2. 3126448158102337920
  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. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data". Astronomy & Astrophysics.
  5. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters.
  6. ESA. (1997). "The Hipparcos and Tycho Catalogues". VizieR On-line Data Catalog.
  7. (2009). "Red giant clump in the Tycho-2 catalogue". Astronomy Letters.
  8. (1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series.
  9. (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics.
  10. "18 Mon".
  11. (1984). "Spectroscopic binary orbits from photoelectric radial velocities. Paper 59: 18 Monocerotis". The Observatory.
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