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PNV J01325510+3047283 is Likely a Red LPV in M33

ATel #4314; K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic) and J. Vrastil (Astronomical Institute, Charles U., Prague, Czech Republic)
on 19 Aug 2012; 16:48 UT
Credential Certification: Allen W. Shafter (aws@nova.sdsu.edu)

Subjects: Optical, Nova, Transient, Variables

Referred to by ATel #: 4315, 4341, 6388, 6697, 6716, 15711

Information about the discovery of a possible nova in M33 by the Lick Observatory Supernova Search (LOSS) was posted here.

We observed the object on Aug. 17.931 and 18.918 - 18.928 UT using the 0.65-m telescope at Ondrejov. The following magnitudes were obtained:

2012 Aug. 17.931 UT, R = 19.2 +/- 0.1; 18.918, R = 19.2 +/- 0.1; 18.928, I = 17.4 +/- 0.1.

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. A more likely classification of the object is that it is a red LPV. This classification is also supported by the presence of the object (designated J013255.19+304728.6) in the Local Group Survey M33 catalog (Massey et al. 2006, AJ, 131, 2478) with V, (B-V), (V-R), and (R-I) magnitudes, respectively: 20.736 +/- 0.014, 0.596 +/- 0.028, 1.339 +/- 0.015, 1.796 +/- 0.006.

Comparison of recent images taken with the 0.65-m telescope at Ondrejov and archival Massey images clearly confirm coincidence of the object on both series of images, and is available through the link below.

Comparison image