@inproceedings{a2b65f50169d4b45bc01e69b524e4e05,
title = "The effect of metallicity on Cepheid magnitudes and the distance to M33",
abstract = "We present the results from a multi-epoch survey of two regions of M33 using the 3.5m WIYN telescope. The inner field is located close to the center 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 relations were used to establish the distance modulus of each region, with μinner = 24.37 ± 0.02 mag and μouter = 24.54 ± 0.03 mag. 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 Period-Luminosity relation γ = δ(m - M) 0/δlogZ = - 0.29 ± 0.11 mag dex-1, consistent with previous measurements. This leads to a metallicity corrected distance modulus to M33 of μγ = 24.53 ± 0.11 mag.",
keywords = "Astronomical observations, M33, Visible; cepheids; local group",
author = "Vicky Scowcroft and David Bersier and Jeremy Mould and Peter Wood",
year = "2009",
doi = "10.1063/1.3246538",
language = "English",
isbn = "9780735407077",
series = "AIP Conference Proceedings",
pages = "43--47",
booktitle = "Stellar Pulsation",
note = "International Conference on Stellar Pulsation: Challenges for Theory and Observation ; Conference date: 31-05-2009 Through 05-06-2009",
}