The Hubble Space Telescope key project on the Extragalactic Distance Scale.: XIX.: The discovery of Cepheids in and a new distance to NGC 3198

被引:28
作者
Kelson, DD
Illingworth, GD
Saha, A
Graham, JA
Stetson, PB
Freedman, WL
Kennicutt, RC
Mould, JR
Ferrarese, L
Huchra, JP
Madore, BF
Prosser, CF
Bresolin, F
Ford, HC
Gibson, BK
Hoessel, JG
Hughes, SMG
Macri, LM
Sakai, S
Silbermann, NA
机构
[1] Carnegie Inst Washington, Dept Terr Magnetism, Washington, DC 20015 USA
[2] Univ Calif Santa Cruz, Univ Calif Observ, Lick Observ, Board Studies Astron & Astrophys, Santa Cruz, CA 95064 USA
[3] Natl Opt Astron Observ, Tucson, AZ 85726 USA
[4] Dominion Astrophys Observ, Victoria, BC V8X 4M6, Canada
[5] Carnegie Inst Washington Observ, Pasadena, CA 91101 USA
[6] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
[7] Australian Natl Univ, Mt Stromlo & Siding Spring Observ, Inst Adv Studies, Weston, ACT 2611, Australia
[8] CALTECH, Dept Astron, Pasadena, CA 91125 USA
[9] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[10] CALTECH, IPAC, Pasadena, CA 91125 USA
[11] European So Observ, D-85478 Garching, Germany
[12] Johns Hopkins Univ, Baltimore, MD 21218 USA
[13] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[14] Univ Colorado, Ctr Astrophys & Space Astron, Boulder, CO 80309 USA
[15] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA
[16] Royal Greenwich Observ, Cambridge CB3 0EZ, England
关键词
Cepheids; galaxies : distances and redshifts; galaxies : individual (NGC 3198);
D O I
10.1086/306989
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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 (similar to V) and five epochs in F814W (similar to I). Two different crowded-held 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 mu(o) = 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 mu(o) = 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.
引用
收藏
页码:614 / 636
页数:23
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