The Extragalactic Distance Scale Key Project. III. The Discovery of Cepheids and a New Distance to M101 Using the Hubble Space Telescope

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view Abstract Citations (122) References (59) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Extragalactic Distance Scale Key Project. III. The Discovery of Cepheids and a New Distance to M101 Using the Hubble Space Telescope Kelson, Daniel D. ; Illingworth, Garth D. ; Freedman, Wendy F. ; Graham, John A. ; Hill, Robert ; Madore, Barry F. ; Saha, Abhijit ; Stetson, Peter B. ; Kennicutt, Robert C., Jr. ; Mould, Jeremy R. ; Hughes, Shaun M. ; Ferrarese, Laura ; Phelps, Randy ; Turner, Anne ; Cook, Kem H. ; Ford, Holland ; Hoessel, John G. ; Huchra, John Abstract We report on the discovery of 29 Cepheid variables in the galaxy M101 using the original Wide Field Camera (WFC) and the new Wide Field and Planetary Camera 2 (WFPC2) on the Hubble Space Telescope. We observed a field in M101 at 17 independent epochs in V (F555W), five epochs in I (F785LP/ F814W), and one epoch in B (F439W), with a time interval baseline of 381 days. We have found Cepheids with periods ranging from 10 to 60 days. The data have been calibrated using WFPC2 observations with zero points derived from ω Cen, Pal 4, and NGC 2419 observations. This calibration has been verified by using the Medium Deep Survey (MDS) WFC photometric zero points, and ground-based secondary standards in V and I. The V calibrations agree to +/- 0.06 mag, and the I calibrations agree to +/- 0.04 mag. We have constructed V and I period-luminosity (PL) relations and have derived apparent distance moduli based on a distance modulus for the Large Magellanic Cloud (LMC) of 18.50 mag and a reddening of E(B - V) = 0.10 mag to the LMC Cepheids. Period-residual minimization was used to minimize the effects of Malmquist bias on the period- luminosity relation fitting process. Using a Galactic extinction law and the apparent V and I distance moduli, we have found a mean reddening for the M101 sample of E(B- V) = 0.03 mag and a true distance modulus to MI01 of 29.34+/-0.17 mag, corresponding to a distance of 7.4 +/- 0.6 Mpc. The sources of error have been rigorously tracked through an error budget; systematic and random errors contribute roughly equally to the quoted error. The mean gas-phase metal abundances in the LMC and in the M101 outer field are similar so we expect metallicity effects to be minimal. These Cepheids will be used in conjunction with results from a Key Project search for Cepheids in an inner field, where the metallicity is larger by a factor of 5, to probe the effects of abundance on the Cepheid period-luminosity relation. Publication: The Astrophysical Journal Pub Date: May 1996 DOI: 10.1086/177221 Bibcode: 1996ApJ...463...26K Keywords: GALAXIES: INDIVIDUAL MESSIER NUMBER: M101 full text sources ADS | data products SIMBAD (50) NED (1) MAST (1) ESA (1) CDS (1) Related Materials (29) Part 1: 1994ApJ...427..628F Part 2: 1994ApJ...428..143H Part 4: 1997ApJ...478..430K Part 5: 1996ApJ...464..568F Part 6: 1997ApJ...475..853F Part 7: 1998ApJ...496..648H Part 8: 1996ApJ...470....1S Part 9: 1997ApJ...477..535G Part 10: 1997ApJ...490..517R Part 11: 1998ApJ...500..763P Part 12: 1998ApJ...501...32H Part 13: 1998ApJ...505..207T Part 14: 1998ApJ...507..655F Part 15: 1998ApJ...498..181K Part 16: 1999ApJ...515....1S Part 17: 1999ApJ...515...29M Part 18: 1999ApJ...512...48G Part 19: 1999ApJ...521..155M Part 20: 1999ApJ...514..614K Part 21: 1999ApJ...516..626G Part 22: 2000ApJ...528..655M Part 23: 1999ApJ...525...80P Part 24: 1999ApJ...523..540S Part 25: 2000ApJ...529..698S Part 26: 2000ApJ...529..723G Part 27: 2000ApJ...529..745F Part 28: 2000ApJ...529..768K Part 29: 2000ApJ...529..786M Part 30: 2000ApJ...545..547M