Geneva Paper Abstracts
Cramer N., Maeder A. (1979, A&A 78, 305)
Based on colour differences measuring the Balmer jump, but with different
sensitivity to the accumulated effets of hydrogen and H- and K-lines, a
method of luminosity and Teff calibration for B-type stars is established
in the Geneva system. The references for calibration rest on star cluster
distances properly adjusted to the Hyades modulus and on Code's et al.
(1976) effective temperatures based on measurements of angular stellar
diameters and absolute UV, visible and IR fluxes. The calibration is
essentially independent of interstellar reddening and it allows a clear
recognition of stellar perculiarities. The effects of unresolved binaries
and rotation are also considered and a comparison with uvby beta results
Kobi D., North P. (1990, A&AS 85, 999)
A new, semi-empirical calibration of the d, m2 and B2-V1 parameters of
Geneva photometry is given, which allows to estimate Te, log g and [Fe/H]
of A4 V-III to G5 V stars. The calibration is based on Kurucz's grid of
atmosphere models, corrected by means of fundamental stars. Recent
evolutionary tracks for stars witgh a metal content Z = 0.02 are used to
calibrate the d vs B2-V1 diagram in term of mass for solar-composition stars.
North P., Nicolet B. (1990, AA 228, 78)
A new, semi-empirical calibration of the two reddening free parameters X and Y
of Geneva photometry in terms of effective temperature and gravity is proposed.
The calibration is based on Kurucz's grid of atmosphere models and on a set of
fundamental stars; it is valid for main sequence stars with Te > 10'000K.
Theoretical evolutionary tracks were then used to calibrate the Y vs X diagram
in terms of stellar mass, for M > 2.5-3.0 M.
Last update: 7 Novembre 1995