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Date and Time of the Query: 2019-06-25 T10:56:39 PDT
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For refcode 2006MNRAS.369.1303H:
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NED Abstract

Copyright by Royal Astronomical Society. 2006MNRAS.369.1303H SN 2004A: another Type II-P supernova with a red supergiant progenitor Hendry, M. A.; Smartt, S. J.; Crockett, R. M.; Maund, J. R.; Gal-Yam, A.; Moon, D.-S., Cenko, S. B.; Fox, D. W.; Kudritzki, R. P.; Benn, C. R.; Ostensen, R. Abstract. We present a monitoring study of SN 2004A and probable discovery of a progenitor star in pre-explosion Hubble Space Telescope (HST) images. The photometric and spectroscopic monitoring of SN 2004A show that it was a normal Type II-P which was discovered in NGC 6207 about two weeks after explosion. We compare SN 2004A to the similar Type II-P SN 1999em and estimate an explosion epoch of 2004 January 6. We also calculate three new distances to NGC 6207 of 21.0 +/- 4.3, 21.4 +/- 3.5 and 25.1 +/- 1.7 Mpc. The former was calculated using the Standard Candle Method (SCM) for SNe II-P, and the latter two from the brightest supergiants method (BSM). We combine these three distances with existing kinematic distances, to derive a mean value of 20.3 +/- 3.4 Mpc. Using this distance, we estimate that the ejected nickel mass in the explosion is 0.046^+0.031^_-0.017_ M_sun_. The progenitor of SN 2004A is identified in pre-explosion WFPC2 F814W images with a magnitude of m_F814W_ = 24.3 +/- 0.3, but is below the detection limit of the F606W images. We show that this was likely a red supergiant (RSG) with a mass of 9^+3^_-2_ M_sun_. The object is detected at 4.7{sigma} above the background noise. Even if this detection is spurious, the 5{sigma} upper limit would give a robust upper mass limit of 12 M_sun_ for a RSG progenitor. These initial masses are very similar to those of two previously identified RSG progenitors of the Type II-P SNe 2004gd (8^+4^_-2_ M_sun_) and 2005cs (9^+3^_-2_ M_sun_). Key words: stars: evolution,supernovae: general,supernovae: individual: SN 2004A,galaxies: distances and redshifts,galaxies: individual: NGC 6207
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