HST Measurements of Cepheid Variables in an Inner Field of M101

Details HST Measurements of Cepheid Variables in an Inner Field of M101 HST Measurements of Cepheid Variables in an Inner Field of M101

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.0604s&link_type=abstract

American Astronomical Society, 186th AAS Meeting, #06.04; Bulletin of the American Astronomical Society, Vol. 27, p.821

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the results of recent observations of a field centered 1\Min7 from the core of the the nearby supergiant Sc-type spiral galaxy M101 (= NGC 5457). The data were obtained with the WFPC2 camera on the Hubble Space Telescope as part of the Key Project on the Extragalactic Distance Scale. This field will represent a crucial testbed for many of the algorithms and techniques that the Key Project will be applying to all its targets: we will present a direct comparison of results as obtained with independent photometric packages (DAOPHOT and DoPHOT), tests based on synthetic star images --- both ``constant stars'' and ``Cepheids'' ---, and experiments with the fully automatic detection of variables and fitting of light-curve parameters. Furthermore, comparison of results for the M101 inner field with those for a second field some 7\Min9 from the center will place new limits on the variation of the P-L relation with metallicity. Representative light curves for Cepheid variables detected within the field will be shown, as will calibrated color-magnitude diagrams for non-variable stars. These data will refine our knowledge of the distance to this galaxy and its fellow group members --- important calibrators of the Tully-Fisher and Type-II supernova expanding-photospheres distance indicators.

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