TheHubble Space TelescopeKey Project on the Extragalactic Distance Scale. XVII. The Cepheid Distance to NGC 4725 | Zendy

B. K. Gibson | Zendy; Shaun M. G. Hughes | Zendy; P. B. Stetson | Zendy; Wendy L. Freedman | Zendy; Robert C. Kennicutt | Zendy; J. R. Mould | Zendy; Fabio Bresolin | Zendy; Laura Ferrarese | Zendy; H. C. Ford | Zendy; J. A. Graham | Zendy; Mingsheng Han | Zendy; Paul Harding | Zendy; J. G. Hoessel | Zendy; J. P. Huchra | Zendy; G. D. Illingworth | Zendy; Daniel D. Kelson | Zendy; Lucas M. Macri | Zendy; Barry F. Madore | Zendy; Randy L. Phelps | Zendy; Charles F. Prosser | Zendy; Abhijit Saha | Zendy; Shoko Sakai | Zendy; Kim Sebo | Zendy; N. A. Silbermann | Zendy; Anne Marie Stewart Turner | Zendy

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TheHubble Space TelescopeKey Project on the Extragalactic Distance Scale. XVII. The Cepheid Distance to NGC 4725

Author(s) -

B. K. Gibson,

Shaun M. G. Hughes,

P. B. Stetson,

Wendy L. Freedman,

Robert C. Kennicutt,

J. R. Mould,

Fabio Bresolin,

Laura Ferrarese,

H. C. Ford,

J. A. Graham,

Mingsheng Han,

Paul Harding,

J. G. Hoessel,

J. P. Huchra,

G. D. Illingworth,

Daniel D. Kelson,

Lucas M. Macri,

Barry F. Madore,

Randy L. Phelps,

Charles F. Prosser,

Abhijit Saha,

Shoko Sakai,

Kim Sebo,

N. A. Silbermann,

Anne Marie Stewart Turner

Publication year - 1999

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/306762

Subject(s) - cepheid variable , distance modulus , physics , astrophysics , cosmic distance ladder , hubble space telescope , astronomy , large magellanic cloud , photometry (optics) , hubble's law , wide field camera 3 , extinction (optical mineralogy) , galaxy , stars , redshift , optics

The distance to NGC 4725 has been derived from Cepheid variables, as part ofthe Hubble Space Telescope Key Project on the Extragalactic Distance Scale.Thirteen F555W (V) and four F814W (I) epochs of cosmic-ray-split Wide Field andPlanetary Camera 2 observations were obtained. Twenty Cepheids were discovered,with periods ranging from 12 to 49 days. Adopting a Large Magellanic Clouddistance modulus and extinction of 18.50+/-0.10 mag and E(V-I)=0.13 mag,respectively, a true reddening-corrected distance modulus (based on an analysisemploying the ALLFRAME software package) of 30.50 +/- 0.16 (random) +/- 0.17(systematic) mag was determined for NGC 4725. The corresponding of distance of12.6 +/- 1.0 (random) +/- 1.0 (systematic) Mpc is in excellent agreement withthat found with an independent analysis based upon the DoPHOT photometrypackage. With a foreground reddening of only E(V-I)=0.02, the inferredintrinsic reddening of this field in NGC 4725, E(V-I)=0.19, makes it one of themost highly-reddened, encountered by the HST Key Project, to date.Comment: To be published in The Astrophysical Journal, Vol. 512 (1999). 34 pages, LaTeX, 9 jpg figure

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