Issue |
Astron. Astrophys. Suppl. Ser.
Volume 130, Number 1, May II 1998
|
|
---|---|---|
Page(s) | 65 - 75 | |
DOI | https://doi.org/10.1051/aas:1998405 | |
Published online | 15 May 1998 |
A standard stellar library for evolutionary synthesis*
II. The M dwarf extension
1
Astronomisches Institut der Universität Basel, Venusstr. 7, CH–4102 Binningen, Switzerland
2
Observatoire de Strasbourg, 11 rue de l'Université, F–67000 Strasbourg, France
3
Universidade de São Paulo, IAG, Dept. de Astronomia, C.P. 9638, São Paulo 01065-970, Brasil
Send offprint request to: T. Lejeune lejeune@astro.unibas.ch
Received:
23
May
1997
Accepted:
31
October
1997
A standard library of theoretical stellar spectra intended for
multiple synthetic photometry applications including spectral
evolutionary synthesis is presented. The grid includes M dwarf model
spectra, hence complementing the first library version established in
Paper I (Lejeune et al. 1997). It covers wide ranges
of fundamental parameters: : 50 000 K ~ 2000 K,
: 5.5
, and
:
. A correction procedure is
also applied to the theoretical spectra in order to provide
color-calibrated flux distributions over a large domain of effective
temperatures. For this purpose, empirical
–color calibrations
are constructed between 11500 K and 2000 K, and semi-empirical
calibrations for non-solar abundances (
to +1.0) are
established. Model colors and bolometric corrections for both the
original and the corrected spectra, synthesized in the
system, are given for the full range
of stellar parameters. We find that the corrected spectra provide a more
realistic representation of empirical stellar colors, though the
method employed is not completely adapted to the lowest temperature
models. In particular the original differential colors of the grid
implied by metallicity and/or luminosity changes are not preserved
below 2500 K. Limitations of the correction method used are also
discussed.
Key words: stars: fundamental parameters / stars: late type
© European Southern Observatory (ESO), 1998