Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-04-23
Astrophys.J.664:850-861,2007
Astronomy and Astrophysics
Astrophysics
Accepted for publication in ApJ. See published article for full resolution figures and electronic tables
Scientific paper
10.1086/519068
We analyze five epochs of Spitzer Space Telescope/Infrared Array Camera (IRAC) observations of the nearby spiral galaxy M33. Each epoch covered nearly a square degree at 3.6, 4.5, and 8.0 microns. The point source catalog from the full dataset contains 37,650 stars. The stars have luminosities characteristic of the asymptotic giant branch and can be separated into oxygen-rich and carbon-rich populations by their [3.6] - [4.5] colors. The [3.6] - [8.0] colors indicate that over 80% of the stars detected at 8.0 microns have dust shells. Photometric comparison of epochs using conservative criteria yields a catalog of 2,923 variable stars. These variables are most likely long-period variables amidst an evolved stellar population. At least one-third of the identified carbon stars are variable.
Ashby Matt L. N.
Eicher K.
Fazio Giacomo
Gehrz Robert D.
Humphreys Roberta M.
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