Astronomy:R Monocerotis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 | T Tauri[2] |
| Astrometry | |
| Distance | 2600 ly (800[4] pc) |
| Details | |
| Mass | ~2–10[5] M☉ |
| Age | ~105 yr[5] years |
| Other designations | |
| 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]
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 astronomical unit|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
- ↑ 1.0 1.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 "R Mon". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=R+Mon.
- ↑ 3.0 3.1 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. doi:10.1051/0004-6361:20011098. Bibcode: 2001A&A...378..116M.
- ↑ Manoj, P. (2006). "Evolution of Emission-Line Activity in Intermediate-Mass Young Stars". The Astrophysical Journal 653 (1): 657–674. doi:10.1086/508764. Bibcode: 2006ApJ...653..657M.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Fuente, A. et al. (October 2006). "A Keplerian Gaseous Disk around the B0 Star R Monocerotis". The Astrophysical Journal 649 (2): L119–L122. doi:10.1086/508349. Bibcode: 2006ApJ...649L.119F.
- ↑ "ASAS All Star Catalogue". The All Sky Automated Survey. http://www.astrouw.edu.pl/asas/?page=aasc.
- ↑ Sandell, Göran et al. (February 2020). "The Molecular Outflow from R Mon". The Astrophysical Journal 889 (2): 9. doi:10.3847/1538-4357/ab6593. 138. Bibcode: 2020ApJ...889..138S.
Further reading
- Murakawa, K. et al. (September 2008). "VLT/NACO and Subaru/CIAO JHK-band high-resolution imaging polarimetry of the Herbig Be star R Monocerotis". Astronomy and Astrophysics 488 (3): L75–L78. doi:10.1051/0004-6361:200810462. Bibcode: 2008A&A...488L..75M.
External links
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