R Monocerotis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Monoceros |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[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] Template:Solar mass |
| Age | ~105 yr[5] years |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[2] | |
| Database references | |
| SIMBAD | data |
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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 Script error: No such module "val". and extends outward to a distance of under Script error: No such module "val". 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 Script error: No such module "val". 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
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- ↑ a b Template:Cite Gaia DR2
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Further reading
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