Ground-based Discovery of Cepheids and Miras in M101

Abstract

We have identified 4 Cepheids and 5 Miras using KPNO 4m BVRI images of an outer field in M101. The Cepheid and Mira periods range from 30 to 60 days and 350 to 800 days, respectively. We derive independent Cepheid and Mira distance moduli that agree within experimental uncertainties. We find a true distance modulus of 29.08 +- 0.13 mag.

28 pages, compressed uuencoded file contains 2 .ps files; finding chart not included, available via anonymous ftp at ftp://igpp.llnl.gov/pub/alves/m101_fig3.ps ; accepted for publication in AJ

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• The HST Key Project on the Extragalactic Distance Scale XII. The Discovery of Cepheids and a New Distance to NGC 2541
• Calibration of the distance scale from galactic Cepheids: I Calibration based on the GFG sample
• Extragalactic Cepheid database