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ASAS-SN Discovery of a Bright Be Star Undergoing a Possible Outburst

ATel #10710; T. Jayasinghe, K. Z. Stanek, C. S. Kochanek (OSU), J. Thorstensen (Dartmouth), J. Rupert (MDM Observatory), J. L. Prieto (Diego Portales; MAS), J. V. Shields, T. A. Thompson (OSU), T. W.-S. Holoien, B. J. Shappee (Carnegie Observatories), Subo Dong (KIAA-PKU)
on 5 Sep 2017; 17:31 UT
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

Subjects: Optical, Variables

Referred to by ATel #: 10713, 10740

As part of an ongoing effort by ASAS-SN project (Shappee et al. 2014; Kochanek et al. 2017) to characterize and catalog all bright variable stars (e.g., Jayasinghe et al. 2017, ATel #10634, #10677), we report the discovery of a bright Be star undergoing a possible outburst.

The source ASASSN-V J010932.93+614659.0 (position from Gaia, g~12.1, parallax=0.60 +/- 0.33 mas) is a Tycho2 source that was previously classified as a K02 subgiant using a best-fit synthetic spectrum (Pickles & Depagne 2010). The ASAS-SN light curve shows a current brightening event (~0.3 mag) over a period of >320 days. A low resolution spectrum of ASASSN-V J010932.93+614659.0 was obtained with the MDM 2.4m telescope + OSMOS spectrometer(range 3960-6850 Angstroms; FWHM res. 4 Angstroms) on the 30th of August 2017. The spectrum shows Balmer and He I lines in absorption and strong narrow H-alpha in emission, characteristic of a Be-type star.

We thank Las Cumbres Observatory and its staff for their continued support of ASAS-SN. ASAS-SN is funded in part by the Gordon and Betty Moore Foundation through grant GBMF5490 to the Ohio State University, NSF grant AST-1515927, the Mt. Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, and the Chinese Academy of Sciences South America Center for Astronomy (CASSACA).