The ACS Nearby Galaxy Survey Treasury III: Cepheids in the Outer Disk of M81

Abstract

The ACS Nearby Galaxy Survey Treasury (ANGST) has acquired deep ACS imaging of a field in the outer disk of the large spiral galaxy M81. These data were obtained over a total of 20 HST orbits, providing a baseline long enough to reliably identify Cepheid variable stars in the field. Fundamental mode and first overtone types have been distinguished through comparative fits with corresponding Cepheid light curve templates derived from principal component analysis of confirmed Cepheids in the LMC, SMC, and Milky Way. A distance modulus of 27.78 pm 0.05_random pm 0.14_systematic with a corresponding distance of 3.60 pm 0.23 Mpc has been calculated from a sample of 11 fundamental mode and 2 first overtone Cepheids (assuming an LMC distance modulus of mu_LMC=18.41 pm 0.10_r pm 0.13_s).

10 pages, 9 figures. Accepted for publication in AJ Fixed typos

References in corpus (6)

• A new Cepheid distance to the maser-host galaxy NGC 4258 and its implications for the Hubble Constant
• The influence of chemical composition on the properties of Cepheid stars. II-The iron content
• Cepheid Distances to SNe Ia Host Galaxies based on a Revised Photometric Zero-Point of the HST-WFPC2 and New P-L Relations and Metallicity Corrections
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Cited by in corpus (3)

• An independent determination of the local Hubble constant
• Redshift-Independent Distances in the NASA/IPAC Extragalactic Database: Methodology, Content and Use of NED-D
• A Panoply of Cepheid Light Curve Templates