ARE THE LUMINOSITIES OF RR-LYRAE STARS AFFECTED BY 2ND PARAMETER EFFECTS

Authors
VANDENBERGH S
Citation
S. Vandenbergh, ARE THE LUMINOSITIES OF RR-LYRAE STARS AFFECTED BY 2ND PARAMETER EFFECTS, The Astrophysical journal, 451(2), 1995, pp. 65-66
Citations number
28
Categorie Soggetti
Astronomy & Astrophysics
Journal title
The Astrophysical journal → ACNP
ISSN journal
0004637X
Volume
451
Issue
2
Year of publication
1995
Part
2
Pages
65 - 66
Database
ISI
SICI code
0004-637X(1995)451:2<65:ATLORS>2.0.ZU;2-G
Abstract
There is a serious discrepancy between the distance to the LMC derived from the Cepheid Period-Luminosity relation and that obtained by usin g the Galactic calibration for the luminosity of RR Lyrae stars. It is suggested that this problem might be due to the fact that second para meter effects make it inappropriate to apply Galactic calibrations to RR Lyrae variables in the Magellanic Clouds, i.e., M(V) (RR) could dep end on both [Fe/H] and on one or more other parameters.