NASA/IPAC EXTRAGALACTIC DATABASE
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For refcode 1998ApJ...501...32H:
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1998ApJ...501...32H The Hubble Space Telescope Extragalactic Distance Scale Key Project. X. The Cepheid Distance to NGC 7331 SHAUN M. G. HUGHES Royal Greenwich Observatory, Madingley Road, Cambridge CB3 0EZ, UK; hughes@ast.cam.ac.uk MINGSHENG HAN AND JOHN HOESSEL University of Wisconsin, Madison, Wisconsin 53706; mhan@malachi.gsfc.nasa.gov, hoessel@uwfpc.astro.wisc.edu WENDY L. FREEDMAN The Observatories, Carnegie Institution of Washington, Pasadena, CA 91101; wendy@ociw.edu ROBERT C. KENNICUTT, JR. Steward Observatory, University of Arizona, Tucson, AZ 85721; robk@as.arizona.edu JEREMY R. MOULD Mount Stromlo and Siding Spring Observatories, Australian National University, Canberra, Australia; jrm@merlin.anu.edu.au ABHIJIT SAHA National Optical Astronomy Observatories, 950 N. Cherry Ave, Tucson, AZ 85726; saha@noao.edu PETER B. STETSON Dominion Astrophysical Observatory, 5071 West Saanich Road, Victoria, BC V8X 4M6, Canada; peter.stetson@hia.nrc.ca BARRY F. MADORE NASA/IPAC Extragalactic Database, Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125; barry@ipac.caltech.edu NANCY A. SILBERMANN Infrared Processing and Analysis Center, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91125; nancys@ipac.caltech.edu PAUL HARDING Steward Observatory, University of Arizona, Tucson, AZ 85721; harding@as.arizona.edu LAURA FERRARESE Palomar Observatory, California Institute of Technology, Pasadena, CA 91125; lff@astro.caltech.edu HOLLAND FORD Department of Physics and Astronomy, Bloomberg 501, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218; ford@stsci.edu BRAD K. GIBSON Mount Stromlo and Siding Spring Observatories, Australian National University, Canberra, Australia; gibson@mso.anu.edu.au JOHN A. GRAHAM Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road, NW, Washington, DC 20015; graham@jag.ciw.edu ROBERT HILL NASA Goddard Space Flight Center, Laboratory for Astronomy and Solar Physics, Greenbelt, MD 20771; hill@esa.nascom.nasa.gov JOHN HUCHRA Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; huchra@cfa.harvard.edu GARTH D. ILLINGWORTH Lick Observatory, University of California, Santa Cruz, CA 95064; gdi@ucolick.org RANDY PHELPS The Observatories, Carnegie Institution of Washington, Pasadena, CA 91101; phelps@ociw.edu AND SHOKO SAKAI Infrared Processing and Analysis Center, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91125; shoko@ipac.caltech.edu Received 1997 October 10; accepted 1998 February 6 ABSTRACT The distance to NGC 7331 has been derived from Cepheid variables observed with the Hubble Space Telescope (HST) WFPC2, as part of the Extragalactic Distance Scale Key Project. Multiepoch exposures in F555W ( ~V) and F814W (~I), with photometry derived independently from DoPHOT and DAOPHOT/ALLFRAME programs, were used to detect a total of 13 reliable Cepheids, with periods between 11 and 42 days. The relative distance moduli between NGC 7331 and the LMC, derived from the V and I magnitudes, imply an extinction to NGC 7331 of A_V_ = 0.47 +/- 0.15 mag and an extinction- corrected distance modulus to NGC 7331 of 30.89 +/- 0.14 (random), equivalent to a distance of 15.1_-0.9_^+1.0^ Mpc. There are additional systematic uncertainties in the distance modulus of +/-0.12 mag resulting from the calibration of the Cepheid period-luminosity relation and a systematic offset of +0.05 +/- 0.04 mag if the metallicity correction inferred from the M101 results of Kennicutt et al. are applied. Subject headings:Cepheids-galaxies: distances and redshifts -galaxies: individual (NGC 7331)-galaxies: photometry
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