Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· References in the article
· Citations to the Article (35) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (18)
· NED Objects (8)
· Reads History
·
· Translate This Page
Title:
On the Discrepancy between the Cepheid and RR Lyrae Distance Scales
Authors:
van den Bergh, Sidney
Publication:
Astrophysical Journal v.446, p.39 (ApJ Homepage)
Publication Date:
06/1995
Origin:
APJ; KNUDSEN
Astronomy Keywords:
COSMOLOGY: DISTANCE SCALE, GALAXIES: DISTANCES AND REDSHIFTS, GALAXIES: LOCAL GROUP, STARS: ABUNDANCES, STARS: VARIABLES: CEPHEIDS
DOI:
10.1086/175763
Bibliographic Code:
1995ApJ...446...39V

Abstract

Available evidence suggests that there is a small discrepancy between distances to Local Group dwarf galaxies determined from Cepheids and RR Lyrae stars. This difference might be due to a slight metallicity dependence of the period luminosity relation for classical Cepheids. Such a dependence would have to be in the sense that metal-poor Cepheids of a given period are slightly fainter than their metal-rich counterparts. If this hypothesis is correct then recent Hubble Space Telescope distances to IC 4182 (SN 1937C) and NGC 5253 (SN 1972E) may have been slightly overestimated, resulting in a small increase in the Hubble parameter H0. Alternatively, the adopted relation between the metallicity and luminosity of RR Lyrae variables might be in error. It is noted that the rather faint Mv(RR) values observed in giant galaxies appear to conflict with the brighter values predicted by horizontal branch models.

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