R Monocerotis

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R Monocerotis
Ngc2261.jpg
R Monocerotis is at the bottom left of this photo.
Credit: HST/NASA/JPL
Observation data
Epoch J2000        Equinox J2000
Constellation Monoceros
Right ascension 06h 39m 09.954s [1]
Declination +08° 44′ 09.56″ [1]
Apparent magnitude  (V)11.85 [2]
Characteristics
Spectral type B8IIIev [3]
Variable type Herbig Ae/Be star [2]
Astrometry
Distance 2600  ly
(800 [4]   pc)
Details
Mass ~2–10 [5]   M☉
Age ~105 yr [5]  years
Other designations
R Mon, BD+08°1427, 2MASS J06390995+0844097, NGC 2261 [2]
Database references
SIMBAD data

R Monocerotis, abbreviated R Mon, is a very young binary star [5] system in the equatorial constellation of Monoceros. The apparent magnitude of R Mon varies between 10 and 12 and the spectral type is B8IIIe. [3]

Contents

A visual band light curve for R Monocerotis, plotted from ASAS data RMonLightCurve.png
A visual band light curve for R Monocerotis, plotted from ASAS data

This is a massive Herbig Ae/Be star, a type of pre-main-sequence star that is surrounded by an orbiting circumstellar disk of gas and dust. This disk has a mass of ~0.007  M☉ and extends outward to a distance of under 150  AU from the host. Because of this dust, the star is obscured from direct visual sight but can still be observed in the infrared. [5] R Mon is still in the accretion phase of star formation and it is driving an optically opaque bipolar outflow with a velocity of 9 km/s. The northern flow is blue-shifted, and thus moving more toward the Sun. [7] There is a T Tauri-type stellar companion at an angular separation of 0.69″ from the primary. [5]

This system is located in a diffuse nebula called "Hubble's Variable Nebula" (NGC 2261), which is being illuminated by a conical beam of light from the primary. [5]

References

  1. 1 2 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR .
  2. 1 2 3 "R Mon". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 26 December 2016.
  3. 1 2 Mora, A.; et al. (2001). "EXPORT: Spectral classification and projected rotational velocities of Vega-type and pre-main sequence stars". Astronomy and Astrophysics. 378: 116–131. Bibcode:2001A&A...378..116M. doi: 10.1051/0004-6361:20011098 .
  4. ↑ Manoj, P. (2006). "Evolution of Emission-Line Activity in Intermediate-Mass Young Stars". The Astrophysical Journal. 653 (1): 657–674. arXiv: astro-ph/0608541 . Bibcode:2006ApJ...653..657M. doi:10.1086/508764. S2CID   17545474.
  5. 1 2 3 4 5 6 Fuente, A.; et al. (October 2006). "A Keplerian Gaseous Disk around the B0 Star R Monocerotis". The Astrophysical Journal. 649 (2): L119 –L122. arXiv: gr-qc/0608088 . Bibcode:2006ApJ...649L.119F. doi:10.1086/508349. S2CID   18763481.
  6. ↑ "ASAS All Star Catalogue". The All Sky Automated Survey. Retrieved 8 December 2021.
  7. ↑ Sandell, Göran; et al. (February 2020). "The Molecular Outflow from R Mon". The Astrophysical Journal. 889 (2): 9. Bibcode:2020ApJ...889..138S. doi: 10.3847/1538-4357/ab6593 . S2CID   213902084. 138.

Further reading

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