The effect of metallicity on Cepheid magnitudes and the distance to M33

Details The effect of metallicity on Cepheid magnitudes and the distance to M33 The effect of metallicity on Cepheid magnitudes and the distance to M33

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mnras.396.1287s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 396, Issue 3, pp. 1287-1296.

Astronomy and Astrophysics

Astronomy

27

Catalogues, Cepheids, Galaxies: Distances And Redshifts, Galaxies: Individual: M33

Scientific paper

We present the results from a multi-epoch survey of two regions of M33 using the 3.5-m Wisconsin-Indiana-Yale-NOAO (WIYN) telescope. The inner field is located close to the centre of the galaxy, with the outer region situated about 5.1 kpc away in the southern spiral arm, allowing us to sample a large metallicity range. We have data for 167 fundamental mode Cepheids in the two regions. The reddening-free Wesenheit magnitude Wvi period-luminosity (PL) relations were used to establish the distance modulus of each region, with μinner = 24.37 +/- 0.02mag and μouter = 24.54 +/- 0.03mag. The apparent discrepancy between these two results can be explained by the significant metallicity gradient of the galaxy. We determine a value for the metallicity parameter of the PL relation = -0.29 +/- 0.11magdex-1, consistent with previous measurements. This leads to a metallicity corrected distance modulus to M33 of μγ = 24.53 +/- 0.11mag.
Based on observations obtained with the WIYN 3.5-m telescope, Kitt Peak National Observatory, National Optical Astronomy Observatories, which is operated by the Association of Universities for Research in Astronomy, Inc. (AURA) under cooperative agreement with the National Science Foundation. The WIYN Observatory is a joint facility of the University of Wisconsin-Madison, Indiana University, Yale University, and the National Optical Astronomy Observatories.
E-mail: vs@astro.livjm.ac.uk

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