R Monocerotis

R Monocerotis
	; 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 09.95s
Declination	+08° 44′ 09.7″
Apparent magnitude (V)	11.85
Characteristics
Spectral type	B8IIIe
Variable type	T Tauri
Astrometry
Radial velocity (Rv)	12 km/s
Distance	2600 ly ; (800 pc)
Other designations
	R Mon, BD+08°1427, GCTP 1550.00, NGC 2261, 2MASS J06390995+0844097
Database references
SIMBAD	data

R Monocerotis (R Mon) is a T Tauri variable in the constellation Monoceros. The apparent magnitude of R Mon varies between 10 and 12 and the spectral type B8IIIe.^[4]

The star is located in a diffuse nebula called "Hubble's Variable Nebula" (NGC 2261). According to some astronomers, the "star" R Monocerotis is not more than a very bright concentration of gases within the nebula, and some sky catalogues and atlases do not list it as a star.

References

^ ^a ^b Cutri, R. M. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog. Bibcode:2003yCat.2246....0C.
^ ^a ^b ^c ^d "R Mon". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 26 December 2016.
^ 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.
^ Mora, A.; Merín, B.; Solano, E.; Montesinos, B.; De Winter, D.; Eiroa, C.; Ferlet, R.; Grady, C. A.; Davies, J. K.; Miranda, L. F.; Oudmaijer, R. D.; Palacios, J.; Quirrenbach, A.; Harris, A. W.; Rauer, H.; Collier Cameron, A.; Deeg, H. J.; Garzón, F.; Penny, A.; Schneider, J.; Tsapras, Y.; Wesselius, P. R. (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.

External links

NASA Astronomy Picture of the Day: NGC 2261: Hubble's Variable Nebula (20 October 1999)

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[2MASS-1] Cutri, R. M. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog. Bibcode:2003yCat.2246....0C.

[SIMBAD-2] "R Mon". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 26 December 2016.

[Manoj-3] 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.

[4] Mora, A.; Merín, B.; Solano, E.; Montesinos, B.; De Winter, D.; Eiroa, C.; Ferlet, R.; Grady, C. A.; Davies, J. K.; Miranda, L. F.; Oudmaijer, R. D.; Palacios, J.; Quirrenbach, A.; Harris, A. W.; Rauer, H.; Collier Cameron, A.; Deeg, H. J.; Garzón, F.; Penny, A.; Schneider, J.; Tsapras, Y.; Wesselius, P. R. (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.

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