The January 2015 outburst of a red nova in M31

0450609 - ASÚ 2016 RIV FR eng J - Journal Article
Kurtenkov, A.A. - Pessev, P. - Tomov, T. - Barsukova, E.A. - Fabrika, S. - Vida, K. - Hornoch, Kamil - Ovcharov, E.P. - Goranskij, V.P. - Valeev, A.F. - Molnár, L. - Sárneczky, K. - Kostov, A. - Nedialkov, P. - Valenti, S. - Geier, S. - Wiersema, K. - Henze, M. - Shafter, A.W. - Dimitrova, R.V.M. - Popov, V.N. - Stritzinger, M.
The January 2015 outburst of a red nova in M31.
Astronomy & Astrophysics. Roč. 578, June (2015), L10/1-L10/5. ISSN 0004-6361. E-ISSN 1432-0746
Institutional support: RVO:67985815
Keywords : novae * cataclysmic variables
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.185, year: 2015

M31N 2015-01a (or M31LRN 2015) is a red nova that erupted in January 2015 - the first event of this kind observed in M31 since 1988. Very few similar events have been confirmed as of 2015. Most of them are considered to be products of stellar mergers. Results of an extensive optical monitoring of the transient in the period January-March 2015 are presented. We present a highly accurate 70 d light curve and astrometry with a 0.05" uncertainty. The colour indices reached a minimum of 2-3 d before peak brightness and rapidly increased afterwards. The spectral type changed from F5I to F0I in 6 d before the maximum and then to K3I in the next 30 d. The luminosity of the transient was estimated to be 8.7(-2.2)(+3.3)x10(5) L-circle dot during the optical maximum. Both the photometric and the spectroscopic results confirm that the object is a red nova, similar to V838 Monocerotis.
Permanent Link: http://hdl.handle.net/11104/0251879