NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-27 T00:03:46 PDT
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For refcode 2010ApJ...715.1094K:
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Copyright by American Astronomical Society. Reproduced by permission
2010ApJ...715.1094K Census of Self-obscured Massive Stars in Nearby Galaxies with Spitzer: Implications for Understanding the Progenitors of SN 2008S-like Transients Khan, Rubab; Stanek, K. Z.; Prieto, J. L.; Kochanek, C. S.; Thompson, Todd A.; Beacom, J. F. Abstract. A new link in the causal mapping between massive stars and potentially fatal explosive transients opened with the 2008 discovery of the dust-obscured progenitors of the luminous outbursts in NGC 6946 and NGC 300. Here, we carry out a systematic mid-IR photometric search for massive, luminous, and self-obscured stars in four nearby galaxies: M33, NGC 300, M81, and NGC 6946. For detection, we use only the 3.6 micron and 4.5 micron IRAC bands, as these can still be used for multi-epoch Spitzer surveys of nearby galaxies (<~10 Mpc). We combine familiar point-spread function and aperture photometry with an innovative application of image subtraction to catalog the self-obscured massive stars in these galaxies. In particular, we verify that stars analogous to the progenitors of the NGC 6946 (SN 2008S) and NGC 300 transients are truly rare in all four galaxies: their number may be as low as ~1 per galaxy at any given moment. This result empirically supports the idea that the dust-enshrouded phase is a very short lived phenomenon in the lives of many massive stars and that these objects constitute a natural extension of the asymptotic giant branch sequence. We also provide mid-IR catalogs of sources in NGC 300, M81, and NGC 6946. Key words: catalogs, galaxies: individual: M33 NGC 300 M81 NGC 6946, supernovae: general, supernovae: individual: SN 2008S
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