The Extragalactic Distance Scale Key Project. XVIII. The Discovery of Cepheids and a New Distance to NGC 4535 Using the Hubble Space Telescope*

L. M. Macri; J. P. Huchra; P. B. Stetson; N. A. Silbermann; W. L. Freedman; R. C. Kennicutt; J. R. Mould; B. F. Madore; F. Bresolin; L. Ferrarese; H. C. Ford; J. A. Graham; B. K. Gibson; M. Han; P. Harding; R. J. Hill; J. G. Hoessel; S. M. G. Hughes; D. D. Kelson; G. D. Illingworth; R. L. Phelps; C. F. Prosser; D. M. Rawson; A. Saha; S. Sakai; A. Turner

doi:10.1086/307541

The Extragalactic Distance Scale Key Project. XVIII. The Discovery of Cepheids and a New Distance to NGC 4535 Using the Hubble Space Telescope^*

L. M. Macri¹, J. P. Huchra¹, P. B. Stetson², N. A. Silbermann³, W. L. Freedman⁴, R. C. Kennicutt⁵, J. R. Mould⁶, B. F. Madore³, F. Bresolin⁷, L. Ferrarese⁸, H. C. Ford⁹, J. A. Graham¹⁰, B. K. Gibson¹¹, M. Han¹², P. Harding⁵, R. J. Hill¹³, J. G. Hoessel¹⁴, S. M. G. Hughes¹⁵, D. D. Kelson¹⁰, G. D. Illingworth¹⁶, R. L. Phelps³, C. F. Prosser^17,18, D. M. Rawson^6,18, A. Saha^19,20, S. Sakai¹⁷, and A. Turner⁵

© 1999. The American Astronomical Society. All rights reserved. Printed in U.S.A.
The Astrophysical Journal, Volume 521, Number 1 Citation L. M. Macri et al 1999 ApJ 521 155 DOI 10.1086/307541

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Author affiliations

¹ Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138

² Dominion Astrophysical Observatory, Victoria, BC V8X 4M6, Canada

³ IPAC, California Institute of Technology, Pasadena, CA 91125

⁴ Carnegie Observatories, Pasadena, CA 91101

⁵ Steward Observatory, University of Arizona, Tucson, AZ 85721

⁶ MSSSO, Australian National University, Weston Creek, ACT 2611, Australia

⁷ European Southern Observatory, Garching b. München, D-85478, Germany

⁸ Department of Astronomy, California Institute of Technology, Pasadena, CA 91125

⁹ John Hopkins University and Space Telescope Institute, Baltimore, MD 21218

¹⁰ DTM, Carnegie Institution of Washington, Washington, DC 20015

¹¹ CASA, University of Colorado, Boulder, CO 80309

¹² Avanti Corporation, Fremont, CA 94538

¹³ University of Wisconsin, Madison, WI, 53706

¹⁴ Lab. for Astronomy and Solar Physics, NASA GSFC, Greenbelt, MD 20771

¹⁵ Institute of Astronomy, University of Cambridge, Cambridge CB3 0HA, England, UK

¹⁶ Lick Observatory, University of California, Santa Cruz, CA 95064

¹⁷ National Optical Astronomy Observatories, Tucson, AZ 85726

¹⁸ Deceased

¹⁹ Space Telescope Science Institute, Baltimore, MD 21218

²⁰ Current address: National Optical Astronomy Observatories, Tucson, AZ 85726

Dates

Received 1998 December 11
Accepted 1999 February 23

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Abstract

We report on the discovery of Cepheids in the Virgo spiral galaxy NGC 4535, based on observations made with the Wide Field and Planetary Camera 2 on board the Hubble Space Telescope (HST). NGC 4535 is one of 18 galaxies observed as a part of The HST Key Project on the Extragalactic Distance Scale, which aims to measure the Hubble constant to 10% accuracy. NGC 4535 was observed over 13 epochs using the F555W filter, and over 9 epochs using the F814W filter. The HST F555W and F814W data were transformed to the Johnson V and Kron-Cousins I magnitude systems, respectively. Photometry was performed using two independent programs, DoPHOT and DAOPHOT II/ALLFRAME. Period-luminosity relations in the V and I bands were constructed using 39 high-quality Cepheids present in our set of 50 variable candidates. We obtain a distance modulus of 31.02 ± 0.26 mag, corresponding to a distance of 16.0 ± 1.9 Mpc. Our distance estimate is based on values of μ₀ = 18.50 ± 0.10 mag and E(V-I) = 0.13 mag for the distance modulus and reddening of the LMC, respectively.

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Footnotes

*
Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, operated by AURA, Inc., under NASA contract NAS 5-26555.

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