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M31N 2013-11b is Likely a Red LPV

ATel #5640; K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic)
on 8 Dec 2013; 21:35 UT
Credential Certification: Allen W. Shafter (aws@nova.sdsu.edu)

Subjects: Optical, Nova, Transient, Variables

Referred to by ATel #: 5744, 9470, 9554

Information about the discovery by E. Ovcharov et al. of a faint (R = 20.3 ± 0.2) probable nova in M31 on 2013 Nov. 7.780 UT was published in ATel #5569.

I observed the object on 2013 Nov. 13.770 - 13.791 UT using the 0.65-m telescope at Ondrejov and Dec. 1.025 - 1.027 UT using the Danish 1.54-m telescope at La Silla. The following magnitudes were obtained:

2013 Nov. 13.770 UT, I = 18.9 ± 0.15; 13.791, R = 20.4 ± 0.25; Dec. 1.025, I = 18.52 ± 0.06; 1.027, R = 19.49 ± 0.08.

The significantly red color of the object is not typical for a classical nova unless it is highly reddened, which is not expected in the line of sight to the object. Thus, a more likely classification of the object is that it is a red LPV which is supported also by its very slow brightening.

Based (in part) on data collected with the Danish 1.54-m telescope at the ESO La Silla Observatory.