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Title:
The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XIX. The Discovery of Cepheids in and a New Distance to NGC 3198
Authors:
Kelson, Daniel D.; Illingworth, Garth D.; Saha, Abhijit; Graham, John A.; Stetson, Peter B.; Freedman, Wendy L.; Kennicutt, Robert C.; Mould, Jeremy R.; Ferrarese, Laura; Huchra, John P.; Madore, Barry F.; Prosser, Charles F.; Bresolin, Fabio; Ford, Holland C.; Gibson, Brad K.; Hoessel, John G.; Hughes, Shaun M. G.; Macri, Lucas M.; Sakai, Shoko; Silbermann, N. A.
Affiliation:
AA(Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road, NW, Washington, DC 20015.; University of California Observatories/Lick Observatory, Board of Studies in Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064.), AB(University of California Observatories/Lick Observatory, Board of Studies in Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064.), AC(National Optical Astronomical Observatory, Tucson, AZ 85726.), AD(Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road, NW, Washington, DC 20015.), AE(Dominion Astrophysical Observatory, Victoria, BC V8X 4M6, Canada.), AF(Carnegie Observatories, Pasadena, CA 91101.), AG(Steward Observatories, University of Arizona, Tucson, AZ 85721.), AH(Mount Stromlo and Siding Spring Observatories, Institute of Advanced Studies, Australian National University, Weston Creek, ACT 2611, Australia.), AI(Department of Astronomy, California Institute of Technology, Mail Stop 105-24, Pasadena, CA 91125.; Hubble Fellowship.), AJ(Harvard Smithsonian Center for Astrophysics, Cambridge, MA 02138.), AK(IPAC, California Institute of Technology, Pasadena, CA 91125.), AL(National Optical Astronomical Observatory, Tucson, AZ 85726.; Deceased.), AM(European Southern Observatory, Garching, D-85478, Germany.), AN(John Hopkins University and Space Telescope Institute, Baltimore, MD 21218), AO(Center for Astrophysics and Space Astronomy, University of Colorado, Boulder, CO 80309.), AP(Department of Astronomy, University of Wisconsin, Madison, WI 53706.), AQ(Royal Greenwich Observatory, Cambridge CB3 0EZ, UK.), AR(Harvard Smithsonian Center for Astrophysics, Cambridge, MA 02138.), AS(National Optical Astronomical Observatory, Tucson, AZ 85726.), AT(IPAC, California Institute of Technology, Pasadena, CA 91125.)
Publication:
The Astrophysical Journal, Volume 514, Issue 2, pp. 614-636. (ApJ Homepage)
Publication Date:
04/1999
Origin:
APJ; UCP
Astronomy Keywords:
STARS: VARIABLES: CEPHEIDS, GALAXIES: DISTANCES AND REDSHIFTS, GALAXIES: INDIVIDUAL: NGC NUMBER: NGC 3198, Stars: Variables: Cepheids, Galaxies: Distances and Redshifts, Galaxies: Individual: NGC Number: NGC 3198
Abstract Copyright:
(c) 1999: The American Astronomical Society
DOI:
10.1086/306989
Bibliographic Code:
1999ApJ...514..614K

Abstract

We report the detection of Cepheid variable stars and a new distance to the Sc spiral NGC 3198. NGC 3198 is one of 25 galaxies that have been observed with the WFPC2 of the Hubble Space Telescope (HST) for the purpose of measuring Cepheid distances. Eighteen of these galaxies were targeted by the HST Key Project on the Extragalactic Distance Scale, whose objective is to calibrate a variety of secondary distant indicators and determine the Hubble constant to an accuracy of 10%. NGC 3198 was selected as part of this sample because its type and orientation make it very suitable as a Tully-Fisher calibrator. The WFPC2 data are comprised of 13 epochs in F555W (~V) and five epochs in F814W (~I). Two different crowded-field photometry packages (DAOPHOT/ALLFRAME and DoPHOT) were used. The magnitudes derived from these two packages agree to within a few percent. We identified 78 Cepheid candidates in the period range from eight to >50 days, of which 52 were selected for establishing the distance modulus. Period-luminosity relations were constructed in Johnson V and Kron-Cousins I by transforming the F555W and F814W to the standard system. We adopted a distance modulus of μ0=18.50+/-0.10 mag and mean reddening of E(B-V)= 0.10 mag to the Large Magellanic Cloud Cepheids and found a true distance modulus to NGC 3198 of μ0=30.80+/-0.16 (random)+/-0.12 (systematic) mag. This modulus corresponds to a distance of 14.5 Mpc, with random and systematic errors of +/-1.2 and +/-0.9 Mpc, respectively.

Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, operated by AURA, Inc. under NASA contract No. NAS5-26555.


Associated Articles

Part  1     Part  2     Part  3     Part  5     Part  8     Part  6     Part  9     Part  4     Part 10     Part  7     Part 15     Part 11     Part 12     Part 13     Part 14     Part 18     Part 20     Part 16     Part 17     Part 21     Part 19     Part 24     Part 23     Part 22     Part 25     Part 26     Part 27     Part 28     Part 29     Part 30    


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