Astrophys. J., 826, 191-191 (2016/August-1)
Multiple outflows in the giant eruption of a massive star.
HUMPHREYS R.M., MARTIN J.C., GORDON M.S. and JONES T.J.
Abstract (from CDS):
The supernova impostor PSN J09132750+7627410 in NGC 2748 reached a maximum luminosity of ≃-14 mag. It was quickly realized that it was not a true supernova, but another example of a nonterminal giant eruption. PSN J09132750+7627410 is distinguished by multiple P Cygni absorption minima in the Balmer emission lines that correspond to outflow velocities of -400, -1100, and -1600 km/s. Multiple outflows have been observed in only a few other objects. In this paper we describe the evolution of the spectrum and the P Cygni profiles for 3 months past maximum, the post-maximum formation of a cool, dense wind, and the identification of a possible progenitor. One of the possible progenitors is an infrared source. Its pre-eruption spectral energy distribution suggests a bolometric luminosity of -8.3 mag and a dust temperature of 780 K. If it is the progenitor, it is above the AGB limit, unlike the intermediate-luminosity red transients. The three P Cygni profiles could be due to ejecta from the current eruption, the wind of the progenitor, or previous mass-loss events. We suggest that they were all formed as part of the same high-mass-loss event and are due to material ejected at different velocities or energies. We also suggest that multiple outflows during giant eruptions may be more common than reported.
© 2016. The American Astronomical Society. All rights reserved.
stars: massive - stars: winds, outflows - supernovae: individual: PSN J09132750+7627410
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