Issue |
A&A
Volume 426, Number 2, November I 2004
|
|
---|---|---|
Page(s) | 641 - 650 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20041048 | |
Published online | 11 October 2004 |
RR Lyrae variables in Galactic globular clusters
IV. Synthetic HB and RR Lyrae predictions
1
INAF - Osservatorio Astronomico di Teramo, via Mentore Maggini, 64100 Teramo, Italy e-mail: cassisi@te.astro.it
2
INAF - Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monte Porzio Catone, Italy e-mail: m.castellani@mporzio.astro.it; caputo@mporzio.astro.it; vittorio@mporzio.astro.it
3
INFN Sezione di Ferrara,via Paradiso 12, 44100 Ferrara, Italy
Received:
7
April
2004
Accepted:
27
June
2004
We present theoretical predictions concerning horizontal
branch stars in globular clusters, including RR Lyrae variables,
as derived from synthetic procedures collating evolutionary and
pulsational constraints. On this basis, we explore the predicted
behavior of the pulsators as a function of the horizontal branch
morphology and over the metallicity range 0.0001 to 0.006,
revealing an encouraging concordance with the observed
distribution of fundamentalised periods with metallicity.
Theoretical relations connecting periods to K magnitudes and
BV or VI Wesenheit functions are presented, both appearing
quite independent of the horizontal branch morphology only with
0.001. Predictions concerning the parameter R are also
discussed and compared under various assumptions about the
horizontal branch reference luminosity level.
Key words: stars: variables: RR Lyrae / stars: evolution / stars: horizontal-branch
© ESO, 2004
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.