The infrared massive stellar content of M?83

摘要

Aims. We present an analysis of archival Spitzer images and new ground-based and Hubble Space Telescope (HST) near-infrared (IR) and optical images of the field of M?83 with the goal of identifying rare, dusty, evolved massive stars. Methods. We present point source catalogs consisting of 3778 objects from Spitzer Infrared Array Camera (IRAC) Band 1 (3.6 μm) and Band 2 (4.5 μm), and 975 objects identified in Magellan 6.5 m FourStar near-IR J and Ks images. A combined catalog of coordinate matched near- and mid-IR point sources yields 221 objects in the field of M?83. Results. We find 49 strong candidates for massive stars which are very promising objects for spectroscopic follow-up. Based on their location in a B ? V versus V ? I diagram, we expect at least 24, or roughly 50%, to be confirmed as red supergiants.