Survey Of Cepheids In M33: On The Origin Of The Distance Modulus Grandient

Details Survey Of Cepheids In M33: On The Origin Of The Distance Modulus Grandient Survey Of Cepheids In M33: On The Origin Of The Distance Modulus Grandient

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21731105p&link_type=abstract

American Astronomical Society, AAS Meeting #217, #311.05; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

We are conducting a detailed photometric survey of variable stars in the nearby galaxy M33 using ground-based B, V, I images. The data cover the entire galactic disk and were collected over a 7 years period. Our work combines the datasets from the DIRECT project as well as more recent data from the WIYN 3.5m telescope. Here we present the detailed stellar photometric catalog in M33, with emphasis on more than 650 confirmed Cepheid stars for which we have fitted light curves. This increases the number of confirmed M33 Cepheids by a factor of almost three.
Based on our Cepheid sample we have studied the impact of stellar crowding and blending on the Cepheid distance determination in M33, and more specifically on the search for the metallicity effect on distance modulus. Combining our ground-based data to archival images from the Hubble Space Telescope, we show that stellar crowding and blending is contributing significantly, if not entirely, to the radial distance modulus gradient observed in M33, which was previously associated to a metallicity effect. Our results suggest that the distance modulus variation with metallicity, and measured in other nearby galaxies, is probably flatter than reported in previous works.

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