M31-RV

Light curves for M31-RV, adapted from Boschi and Munari (2004).[1] The red dots show thered band magnitude, and the blue dots show the blue band magnitude.
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Andromeda
Right ascension	00h 43m 02.433s[2]
Declination	+41° 12′ 56.17″[2]
Characteristics
Evolutionary stage	M supergiant[1]
Spectral type	M0I-M7I[1]
Variable type	Luminous Red Nova
Details
Radius	2,000 during outburst[3] R☉
Luminosity	900,000 during outburst[3][a] L☉
Temperature	4,000 during outburst[3] K
Other designations
M31 V1006, M31 V1007, McD 88 1
Database references
SIMBAD	data

M31-RV is a possible redcataclysmic variable star located in theAndromeda Galaxy (M31) that experienced an outburst in 1988,^[4] which was similar to the outburstV838 Monocerotis experienced in 2002.^[3] At peak brightness, M31-RV was the most luminous red supergiant in theLocal Group.^[4] Such objects have been calledluminous red novae or intermediate-luminosity red transients. During the outburst, both V838 Mon and M31-RV reached a maximumabsolute visual magnitude of -9.8.^[1]

In 2006, the area around M31-RV was observed using theHubble Space Telescope, but onlyred giants were seen. Most likely the star either became too dim for Hubble to see, the star is a companion of one of the red giants, or the star is one of the red giants themselves.^[2]

M31-RV reached a peakvisual magnitude of 17 before fading rapidly and showing dust formation. The most likely explanation states that these outbursts occur duringstellar merger events.^[5]

• AE Andromedae

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