Mon. Not. R. Astron. Soc., 369, 1303-1320 (2006/July-1)
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. and OSTENSEN R.
Abstract (from CDS):
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±1.7Mpc. The former was calculated using the Standard Candle Method (SCM) for SNeII-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±3.4Mpc. Using this distance, we estimate that the ejected nickel mass in the explosion is 0.046+0.031–0.017M☉. The progenitor of SN 2004A is identified in pre-explosion WFPC2 F814W images with a magnitude of mF814W= 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+3–2M☉. The object is detected at 4.7σ above the background noise. Even if this detection is spurious, the 5σ upper limit would give a robust upper mass limit of 12M☉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+4–2M☉) and 2005cs (9+3–2M☉).
2006 The Authors. Journal compilation © 2006 RAS
stars: evolution - supernovae: general - supernovae: individual: SN 2004A - galaxies: distances and redshifts - galaxies: individual: NGC 6207
Comparison stars in table 2 not in simbad.
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