Cepheids and Long-Period Variables in NGC 4395

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© 2004. The American Astronomical Society. All rights reserved. Printed in U.S.A.
, , Citation F. Thim et al 2004 AJ 127 2322 DOI 10.1086/382244

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Author affiliations

1 National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85726

2 Washburn Observatory, University of Wisconsin-Madison, 475 North Charter Street, Madison, WI 53706

3 Astronomisches Institut, Universität Basel, Venusstrasse 7, CH-4102 Binningen, Switzerland

4 NOAO is operated by the Association of Universities for Research in Astronomy, (AURA), Inc., under cooperative agreement with the National Science Foundation

5 The WIYN Observatory is a joint facility of the University of Wisconsin-Madison, Indiana University, Yale University, and the National Optical Astronomy Observatory

6 Visiting Astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatory, which is operated by AURA, Inc., under cooperative agreement with the National Science Foundation

Dates

  1. Received 2003 November 7
  2. Accepted 2003 December 19
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1538-3881/127/4/2322

Abstract

Repeated imaging observations of NGC 4395 were made with the WIYN 3.5 m and the KPNO 2.1 m telescopes. From the photometry of the resolved brighter stars in this galaxy, 11 Cepheids with periods ranging between 12 and 90 days have been identified. The true distance modulus has been derived from the apparent distance moduli in g, r, and i. The distance modulus is 28.02 ± 0.18 based on the LMC period-luminosity (P-L) relation of Sandage, Reindl, & Tammann; this corresponds to a distance of 4.0 ± 0.3 Mpc. Using the P-L relation from Madore & Freedman, the distance modulus is 28.15 ± 0.18, which corresponds to a distance of 4.3 ± 0.4 Mpc. The reddening is calculated to be E(g–r) = 0.06 ± 0.08 and E(r–i) = 0.10 ± 0.08, again from the distance moduli μg, μr, and μi. In addition, 37 other variables have been detected, the majority of which have definite periods; they are probably all red long-period variables.

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10.1086/382244