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: http://www.stsci.edu/~kgordon/papers/2006AJ....132.1415B.html
Дата изменения: Thu Jan 21 20:01:43 2016 Дата индексирования: Sun Apr 10 16:20:21 2016 Кодировка: ISO8859-5 Поисковые слова: spitzer space telescope |
We present Spitzer Space Telescope IRAC and MIPS observations of the Galactic globular cluster M15 (NGC 7078), one of the most metal-poor clusters, with a [Fe/H]=-2.4. Our Spitzer images reveal a population of dusty red giants near the cluster center, a previously detected planetary nebula designated K648, and a possible detection of the intracluster medium arising from mass-loss episodes from the evolved stellar population. Our analysis suggests that (9+/-2)У?10-4 Msolar of dust is present in the core of M15, and that this material has accumulated over a period of ~106 yr, a timescale 10 times shorter than the last Galactic plane crossing event. We also present Spitzer IRS follow-up observations of K648, including the detection of the [Ne II] 12.81 ЮМm line, and discuss abundances derived from infrared fine-structure lines.
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[2006,1][2007,6][2008,8][2009,9][2010,3][2011,6][2012,2][2013,2][2014,3][2015,7]
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