Issue |
A&A
Volume 381, Number 2, JanuaryII 2002
|
|
---|---|---|
Page(s) | 524 - 538 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20011493 | |
Published online | 15 January 2002 |
A standard stellar library for evolutionary synthesis
III. Metallicity calibration
1
Astronomisches Institut der Universität Basel, Venusstrasse 7, 4102 Binningen, Switzerland e-mail: westera@astro.unibas.ch, buser@astro.unibas.ch
2
Observatório Astronómico da Universidade de Coimbra, Portugal e-mail: lejeune@mat.uc.pt
3
Depto. de Astronomia, Universidade Federal do Rio de Janeiro, Brazil e-mail: cuisinie@sun1.ov.ufrj.br
4
Centro de Investigaciones de Astronomía, Mérida, Venezuela e-mail: bruzual@cida.ve
Corresponding author: R. Buser, buser@astro.unibas.ch
Received:
17
July
2001
Accepted:
19
October
2001
We extend the colour calibration of the widely used BaSeL standard
stellar library (Lejeune et al. 1997, 1998)
to non-solar metallicities, down to dex.
Surprisingly, we find that at the present epoch it is virtually
impossible to establish a unique calibration ofUBVRIJHKL
colours in terms of stellar metallicity
which is consistent
simultaneously with both colour-temperature relations and colour-absolute
magnitude diagrams (CMDs) based on observed globular cluster photometry
data and on published, currently popular standard stellar evolutionary
tracks and isochrones.
The problem appears to be related to the long-standing incompleteness
in our understanding of convection in late-type stellar evolution, but
is also due to a serious lack of relevant observational calibration
data that would help resolve, or at least further significant progress
towards resolving this issue.
In view of the most important applications of the BaSeL library, we here
propose two different metallicity calibration versions: (1) the “WLBC 99”
library, which consistently matches empirical colour-temperature relations
and which, therefore, should make an ideal tool for the study of individual
stars; and (2), the “PADOVA 2000” library, which provides isochrones from the
Padova 2000 grid (Girardi et al. [CITE]) that successfully reproduce Galactic
globular-cluster colour-absolute magnitude diagrams and which thus should
prove particularly useful for studies of collective phenomena in stellar
populations in clusters and galaxies.
Key words: catalogs / stars: abundances / stars: atmospheres / stars: fundamental parameters
© ESO, 2002
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