Interstellar extinction in the Galactic Center and its impact on the study of AGB stars

Details Interstellar extinction in the Galactic Center and its impact on the study of AGB stars Interstellar extinction in the Galactic Center and its impact on the study of AGB stars

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009eimw.confe..59s&link_type=abstract

"The Evolving ISM in the Milky Way and Nearby Galaxies, The Fourth Spitzer Science Center Conference, Proceedings of the confere

Physics

Galaxy: Stellar Content, Infrared: Stars, Infrared: Ism, Ism: Dust, Extinction

Scientific paper

We present here a high resolution interstellar extinction map of the central 280 × 200 pc of the Galactic Center (GC). We derive this from the Spitzer/IRAC GC point source catalog of Ramírez et al. (2008), consisting of ˜1 million sources, the majority of which are red giants and AGB stars. We derive new extinction values by using the [3.6]-[5.8] colour-magnitude diagram together with the newest isochrones of Marigo et al. (2008). We find extinction values up to A_V ˜ 90 mag. We also present a study of the Long Period Variables (LPVs) in the GC. We discuss the locus of LPVs in the Spitzer/IRAC colour-magnitude diagrams as well as their period-magnitude relations.

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