Sign on
ADS Classic is now deprecated. It will be completely retired in October 2019. Please redirect your searches to the new ADS modern form or the classic form. More info can be found on our blog.

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· On-line Data
· References in the article
· Citations to the Article (546) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (5)
· NED Objects (1)
· Associated Articles
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
The Hubble Space Telescope Extragalactic Distance Scale Key Project. 1: The discovery of Cepheids and a new distance to M81
Authors:
Freedman, Wendy L.; Hughes, Shaun M.; Madore, Barry F.; Mould, Jeremy R.; Lee, Myung Gyoon; Stetson, Peter; Kennicutt, Robert C.; Turner, Anne; Ferrarese, Laura; Ford, Holland; Graham, John A.; Hill, Robert; Hoessel, John G.; Huchra, John; Illingworth, Garth D.
Affiliation:
AA(Carnegie Observatories, Pasadena, CA, US), AB(Carnegie Observatories, Pasadena, CA, US), AC(California Inst. of Technology, Pasadena, CA, US), AD(California Inst. of Technology, Pasadena, CA, US), AE(Carnegie Observatories, Pasadena, CA, US), AF(Carnegie Observatories, Pasadena, CA, US), AG(Steward Observatory, Tucson, AZ), AH(Steward Observatory, Tucson, AZ), AI(Steward Observatory, Tucson, AZ), AJ(Steward Observatory, Tucson, AZ), AK(Steward Observatory, Tucson, AZ), AL(Steward Observatory, Tucson, AZ), AM(Steward Observatory, Tucson, AZ), AN(Steward Observatory, Tucson, AZ), AO(Steward Observatory, Tucson, AZ)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 427, no. 2, p. 628-655 (ApJ Homepage)
Publication Date:
06/1994
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Astrometry, Astronomical Photometry, Calibrating, Cepheid Variables, Distance, Scale (Ratio), Spiral Galaxies, Data Reduction, Data Sampling, Hubble Constant, Hubble Space Telescope, Interstellar Extinction, Red Shift, Stellar Luminosity, Stellar Magnitude
DOI:
10.1086/174172
Bibliographic Code:
1994ApJ...427..628F

Abstract

We report on the discovery of 30 new Cepheids in the nearby galaxy M81 based on observations using the Hubble Space Telescope (HST). The periods of these Cepheids lie in the range of 10-55 days, based on 18 independent epochs using the HST wide-band F555W filter. The HST F555W and F785LP data have been transformed to the Cousins standard V and I magnitude system using a ground-based calibration. Apparent period-luminosity relations at V and I were constructed, from which apparent distance moduli were measured with respect to assumed values of mu0 = 18.50 mag and E(B - V) = 0.10 mag for the Large Magellanic Cloud. The difference in the apparent V and I moduli yields a measure of the difference in the total mean extinction between the M81 and the LMC Cepheid samples. A low total mean extinction to the M81 sample of E(B - V) = 0.03 +/- 0.05 mag is obtained. The true distance modulus to M81 is determined to be 27.80 +/- 0.20 mag, corresponding to a distance of 3.63 +/- 0.34 Mpc. These data illustrate that with an optimal (power-law) sampling strategy, the HST provides a powerful tool for the discovery of extragalactic Cepheids and their application to the distance scale. M81 is the first calibrating galaxy in the target sample of the HST Key Project on the Extragalactic Distance Scale, the ultimate aim of which is to provide a value of the Hubble constant to 10% accuracy.

Associated Articles

Part  1     Part  2     Part  3     Part  5     Part  8     Part  6     Part  9     Part  4     Part 10     Part  7     Part 15     Part 11     Part 12     Part 13     Part 14     Part 18     Part 20     Part 16     Part 17     Part 21     Part 19     Part 24     Part 23     Part 22     Part 25     Part 26     Part 27     Part 28     Part 29     Part 30    


Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences



More Article Retrieval Options

HELP for Article Retrieval


Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)


Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints