R Monocerotis
{{Short description|Variable star in the constellation Monoceros}}
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| caption = R Monocerotis is at the bottom left of this photo.
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{{Starbox observe
| constell = Monoceros
| epoch = J2000
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{{Starbox character
| type =
| b-v =
| variable = Herbig Ae/Be star
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{{Starbox astrometry
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| dist_ly = 2600
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{{Starbox catalog
| names = {{odlist | V=R Mon | BD=+08°1427 | GCTP=1550.00 | NGC=2261 | 2MASS=J06390995+0844097 }}
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{{Starbox reference
| Simbad=V*+R+Mon
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R Monocerotis, abbreviated R Mon, is a very young binary star system in the equatorial constellation of Monoceros. The apparent magnitude of R Mon varies between 10 and 12 and the spectral type is B8IIIe.
File:RMonLightCurve.png 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 {{val|0.007|ul=Solar mass|p=~}} and extends outward to a distance of under {{val|150|ul=AU}} from the host. Because of this dust, the star is obscured from direct visual sight but can still be observed in the infrared. 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. There is a T Tauri-type stellar companion at an angular separation of {{val|0.69|ul=arcsecond}} from the primary.
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.
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References
{{reflist|refs=
{{Cite Gaia DR2|3326498762563125376}}
{{cite simbad|title=R Mon|accessdate=26 December 2016}}
| title=Evolution of Emission-Line Activity in Intermediate-Mass Young Stars
| last=Manoj | first=P.
| journal=The Astrophysical Journal
| volume=653 | issue=1 | pages=657–674 | date=2006
| bibcode=2006ApJ...653..657M | doi=10.1086/508764
| arxiv=astro-ph/0608541 | s2cid=17545474}}
| title=EXPORT: Spectral classification and projected rotational velocities of Vega-type and pre-main sequence stars
| last1=Mora | first1=A. | last2=Merín | first2=B.
| last3=Solano | first3=E. | last4=Montesinos | first4=B.
| last5=De Winter | first5=D. | last6=Eiroa | first6=C.
| last7=Ferlet | first7=R. | last8=Grady | first8=C. A.
| last9=Davies | first9=J. K.| last10=Miranda | first10=L. F.
| last11=Oudmaijer | first11=R. D.| last12=Palacios | first12=J.
| last13=Quirrenbach | first13=A. | last14=Harris | first14=A. W.
| last15=Rauer | first15=H. | last16=Collier Cameron | first16=A.
| last17=Deeg | first17=H. J. | last18=Garzón | first18=F.
| last19=Penny | first19=A. | last20=Schneider | first20=J.
| last21=Tsapras | first21=Y. | last22=Wesselius | first22=P. R.
| display-authors=1 | journal=Astronomy and Astrophysics
| volume=378 | pages=116–131 | year=2001
| doi=10.1051/0004-6361:20011098 | doi-access=free
| bibcode=2001A&A...378..116M }}
| title=A Keplerian Gaseous Disk around the B0 Star R Monocerotis
| display-authors=1 | last1=Fuente | first1=A.
| last2=Alonso-Albi | first2=T. | last3=Bachiller | first3=R.
| last4=Natta | first4=A. | last5=Testi | first5=L.
| last6=Neri | first6=R. | last7=Planesas | first7=P.
| journal=The Astrophysical Journal
| volume=649 | issue=2 | pages=L119–L122 | date=October 2006
| doi=10.1086/508349 | arxiv=gr-qc/0608088
| bibcode=2006ApJ...649L.119F | s2cid=18763481 }}
| title=The Molecular Outflow from R Mon
| last1=Sandell | first1=Göran | last2=Vacca | first2=W.
| last3=Bouscasse | first3=L. | last4=Güsten | first4=R.
| display-authors=1 | journal=The Astrophysical Journal
| volume=889 | issue=2 | id=138 | pages=9 | date=February 2020
| doi=10.3847/1538-4357/ab6593 | bibcode=2020ApJ...889..138S | s2cid=213902084 | doi-access=free }}
}}
Further reading
- {{cite journal
| title=VLT/NACO and Subaru/CIAO JHK-band high-resolution imaging polarimetry of the Herbig Be star R Monocerotis
| last1=Murakawa | first1=K. | last2=Preibisch | first2=T.
| last3=Kraus | first3=S. | last4=Ageorges | first4=N.
| last5=Hofmann | first5=K. -H. | last6=Ishii | first6=M.
| last7=Oya | first7=S. | last8=Rosen | first8=A.
| last9=Schertl | first9=D. | last10=Weigelt | first10=G.
| display-authors=1 | journal=Astronomy and Astrophysics
| volume=488 | issue=3 | pages=L75–L78 | date=September 2008
| doi=10.1051/0004-6361:200810462 | bibcode=2008A&A...488L..75M | doi-access=free }}
External links
- {{APOD |date=20 October 1999 |title=NGC 2261: Hubble's Variable Nebula}}
{{Stars of Monoceros}}
{{DEFAULTSORT:R Monocerotis}}