Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-03-13
Astr. Ap., 371 (2001) 579 (Erratum: Astr. Ap., 374 (2001) 264
Astronomy and Astrophysics
Astrophysics
14 pages, 11 figures, 11 tables, accepted in Astronomy & Astrophysics
Scientific paper
10.1051/0004-6361:20010346
Our former study on the empirical relations between the Fourier parameters of the light curves of the fundamental mode RR Lyrae stars and their basic stellar parameters has been extended to considerably larger data sets. The most significant contribution to the absolute magnitude M_v comes from the period P and from the first Fourier amplitude A_1, but there are statistically significant contributions also from additional higher order components, most importantly from A_3 and in a lesser degree from the Fourier phase phi_51. When different colors are combined in reddening-free quantities, we obtain basically period-luminosity-color relations. Due to the log T_eff (B-V, log g, [Fe/H]) relation from stellar atmosphere models, we would expect some dependence also on phi_31. Unfortunately, the data are still not extensive and accurate enough to decipher clearly the small effect of this Fourier phase. However, with the aid of more accurate multicolor data on field variables, we show that this Fourier phase should be present either in V-I or in B-V or in both. From the standard deviations of the various regressions, an upper limit can be obtained on the overall inhomogeneity of the reddening in the individual clusters. This yields sigma_E(B-V)}< 0.012 mag, which also implies an average minimum observational error of sigma_V > 0.018 mag.
Kovacs Gabor
Walker Alistair R.
No associations
LandOfFree
Empirical relations for cluster RR Lyrae stars revisited does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Empirical relations for cluster RR Lyrae stars revisited, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Empirical relations for cluster RR Lyrae stars revisited will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-424181