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

M31-RV is a red 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]

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]

See also[edit]


  1. 1.0 1.1 1.2 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: 17. arXiv:1105.4595. Bibcode 2011ApJ...737...17B. doi:10.1088/0004-637X/737/1/17.
  2. 2.0 2.1 2.2 Boschi, F.; Munari, U. (2004). "M 31-RV evolution and its alleged multi-outburst pattern". Astronomy and Astrophysics 418 (3): 869. arXiv:astro-ph/0402313. Bibcode 2004A&A...418..869B. doi:10.1051/0004-6361:20035716.

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