dc.contributor.author |
Arellano Ferro, A |
|
dc.contributor.author |
Bramich, D. M |
|
dc.contributor.author |
Giridhar, S |
|
dc.date.accessioned |
2020-11-17T14:30:14Z |
|
dc.date.available |
2020-11-17T14:30:14Z |
|
dc.date.issued |
2017-04 |
|
dc.identifier.citation |
Revista Mexicana de Astronomica y Astrofisica, Vol. 53, No. 1, pp. 121-131 |
en_US |
dc.identifier.issn |
0185-1101 |
|
dc.identifier.uri |
http://prints.iiap.res.in/handle/2248/7164 |
|
dc.description |
Open Access © Institute de Astronomia http://www.astroscu.unam.mx/rmaa/RMxAA..53-1/PDF/RMxAA..53-1_aarellano.pdf |
en_US |
dc.description.abstract |
We describe and summarize the findings from our CCD time-seri
es photom-
etry of globular clusters (GCs) program and the use of differe
nce image analysis
(DIA) in the extraction of precise light curves down to
V
≈
19 mag in crowded
regions. We have discovered approximately 250 variable sta
rs in a sample of 23
selected GCs. The absolute magnitude and [Fe/H] for each ind
ividual RR Lyrae
is obtained via the Fourier decomposition of the light curve
. An average of these
parameters leads to the distance and metallicity of the host
GCs. We present the
mean [Fe/H],
M
V
and distance for 26 GCs based exclusively on the RR Lyrae ligh
t
curve Fourier decomposition technique on an unprecedented
homogeneous scale.
We also discuss the luminosity dependence of the horizontal
branch (HB) via the
M
V
-[Fe/H] relation. We find that this relation should be consid
ered separately for
the RRab and RRc stars. |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
Institute de Astronomia |
en_US |
dc.subject |
Globular clusters: general |
en_US |
dc.subject |
Stars: abundances |
en_US |
dc.subject |
Stars: fundamental parameters |
en_US |
dc.subject |
Stars: variables: RR Lyrae |
en_US |
dc.title |
CCD time-series photometry of variable stars in globular clusters and the metallicity dependence of the horizontal branch luminosity |
en_US |
dc.type |
Article |
en_US |