The Extragalactic Distance Scale Key Project. XVI. Cepheid Variables in an Inner Field of M101

Details The Extragalactic Distance Scale Key Project. XVI. Cepheid Variables in an Inner Field of M101 The Extragalactic Distance Scale Key Project. XVI. Cepheid Variables in an Inner Field of M101

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...508..491s&link_type=abstract

The Astrophysical Journal, Volume 508, Issue 2, pp. 491-517.

Astronomy and Astrophysics

Astronomy

84

Stars: Variables: Cepheids, Galaxies: Distances And Redshifts, Galaxies: Individual: Messier Number: M101, Galaxies: Photometry

Scientific paper

We report on the identification of 255 candidate variable stars in a field located some 1.7′ from the center of the late-type spiral galaxy M101 = NGC 5457, based on observations made with the Wide Field and Planetary Camera 2 on board the Hubble Space Telescope. Photometric measurements in the F555W and F814W filters-analyzed independently with the DAOPHOT/ALLFRAME and DoPHOT software suites-have been transformed to the Johnson V and Kron-Cousins I standard magnitude systems. Periods and intensity-averaged mean magnitudes for 61 carefully selected candidate Cepheid variables with periods in the range 10-48 days indicate a reddening-corrected mean distance modulus (m - M)_0 = 29.05 +/- 0.14 (if the true modulus of the Large Magellanic Cloud is 18.50 +/- 0.10, and if there is no dependence of the period-luminosity relation on metal abundance); results consistent with this are obtained whether or not the sample is expanded to include a larger fraction of the candidates. Applying a metallicity-dependent correction of +0.16 +/- 0.10 mag would increase this estimate to (m - M)_0 = 29.21 +/- 0.17 mag.

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