Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic On-line Article (HTML)
· Full Printable Article (PDF/Postscript)
· Scanned Article (GIF)
· Table of Contents
· Citations to the Article (2) (Citation History)
· Refereed Citations to the Article
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
The Metallicity of MACHO Galactic Bulge RR0 Lyrae Stars from Fourier Coefficients of Light Curves
Authors:
Kunder, A. M.; Chaboyer, B.; Popowski, P.; Nikolaev, S.; Cook, K. H.
Publication:
Astrophysics of Variable Stars, Pecs, Hungary, 5-10 September 2005, Sterken, C. and Aerts, C. (eds). ASP Conference Series, Vol. 349, p. 273. San Francisco: Astronomical Society of the Pacific, 2006.
Publication Date:
04/2006
Origin:
AUTHOR
Bibliographic Code:
2006ASPC..349..273K

Abstract

Metallicities of 2610 RR0 Lyrae stars observed toward the MACHO Survey fields in the Galactic bulge are obtained. These [Fe/H] metallicities are based upon an empirically calibrated relationship that uses the Fourier coefficients of the light curve. We find that the RR0 Lyrae stars that belong to the Galactic bulge have average metallicities [Fe/H] = -0.995 ± 0.006 (statistical), with a broad metallicity range from [Fe/H] = -2.32 to 0.23 . We provide the most complete and extensive metallicity determination to date, with a typical internal error of 0.20 dex. Using mean magnitudes of MACHO RR Lyrae stars we searched for the evidence of the Galactic bar. A barred distribution could be seen only in the inner fields, within l<4° and b>-4°. The most straightforward interpretation of the absence of a strong bar, is that the RR Lyrae in the bulge represent a different population than the metal-rich majority. The RR0 stars from Sagittarius dwarf galaxy have lower average metallicity of [Fe/H] = -1.289 ± 0.016 (statistical), with an intrinsic dispersion considerably lower than that in the bulge. The MACHO database has provided information that confirms previous investigations on the nature of RR0 Lyrae stars in both the Galactic bulge and the Sagittarius dwarf galaxy.

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
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints