Issue |
Astron. Astrophys. Suppl. Ser.
Volume 122, Number 1, April I 1997
|
|
---|---|---|
Page(s) | 51 - 77 | |
DOI | https://doi.org/10.1051/aas:1997291 | |
Published online | 15 April 1997 |
A calibration of Geneva photometry for B to G stars in terms of
Teff, log g and
1
Institut d'Astronomie de l'Université de Lausanne, CH-1290 Chavannes-des-Bois, Switzerland
2
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, U.S.A.
3
Observatoire de Genève, CH-1290 Sauverny, Switzerland
Send offprint request to: M. Künzli
Received:
16
April
1996
Accepted:
26
June
1996
We have used recent Kurucz models and numerous standard stars to improve the
calibration of the Geneva photometric system proposed a few years ago.
A new photometric diagram for the classification of intermediate stars
() is proposed and fills
a gap that the previous calibration had left open.
Evidence is given for a clear inadequacy of the new Kurucz models in the
region of the parameter space where convection begins to take over radiation
in the star's atmosphere. This problem makes the determination of the surface
gravity difficult, but leaves that of the other parameters apparently
unaffected. The determination of metallicity is considerably improved,
thanks to the homogeneous spectroscopic data published recently by
Edvardsson et al. (1993).
Instead of showing the traditional diagrams, we chose to publish the diagrams
of the physical parameters with the inverted grids inside, i.e. the lines of
constant photometric parameters
Key words: stars: general; atmospheres; fundamental parameters
© European Southern Observatory (ESO), 1997