M31-RV

M31-RV is a possible red cataclysmic variable star located in the Andromeda Galaxy that experienced an outburst in 1988, which is similar to the outburst V838 Monocerotis experienced in 2002. Such objects have been called Luminous Red Novae or intermediate-luminosity red transients. During the outburst, both V838 Mon and M31-RV reached a maximum absolute visual magnitude of -9.8.[2]

M31-RV

Andromeda Galaxy, the galaxy where M31-RV is located.
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Andromeda
Right ascension	00^h 43^m 02.433^s[1]
Declination	41° 12′ 56.17″[1]
Characteristics
Evolutionary stage	M supergiant[2]
Spectral type	M0I - >M7I[2]
Variable type	Luminous Red Nova
Other designations
M31 V1006, M31 V1007, McD 88 1
Database references
SIMBAD	data

In 2006, the area around M31-RV was observed using the Hubble Space Telescope, but only red giants were seen. It is thought that the star either became too dim for Hubble to see, or the star is a companion of one of the red giants, or the star is one of the red giants themselves.[1]

M31-RV reached a peak visual magnitude of 17 before fading rapidly and showing dust formation. The most likely explanation states that these outbursts occur during stellar merger events.[3]

See also

• AE Andromedae

References

1. Bond, Howard E. (2011). "Hubble Space Telescope Imaging of the Outburst Site of M31 RV. II. No Blue Remnant in Quiescence". The Astrophysical Journal. 737 (1): 17. arXiv:1105.4595. Bibcode:2011ApJ...737...17B. doi:10.1088/0004-637X/737/1/17.
2. Boschi, F.; Munari, U. (2004). "M 31-RV evolution and its alleged multi-outburst pattern". Astronomy and Astrophysics. 418 (3): 869–875. arXiv:astro-ph/0402313. Bibcode:2004A&A...418..869B. doi:10.1051/0004-6361:20035716.
3. Kochanek, C. S.; Adams, Scott M.; Belczynski, Krzysztof (2014). "Stellar mergers are common" (PDF). Monthly Notices of the Royal Astronomical Society. 443 (2): 1319. arXiv:1405.1042. Bibcode:2014MNRAS.443.1319K. doi:10.1093/mnras/stu1226. Retrieved July 16, 2019.