CAOSP abstracts, Volume: 27, No.: 3, year: 1998
- Author(s): FIGUERAS, F.; LURI, X.; GOMEZ, A.E.; TORRA, J.; JORDI, C.; MENNESSIER,
M.O.; DOMINGO, A.; MASANA, E.; GRENIER, S.; BLASI, F.
- Journal: Contributions of the Astronomical Observatory Skalnate Pleso,
vol. 27, no. 3, p. 184-191.
- Date: 04/1998
- Title: CP stars: Photometric calibrations of luminosity using Hipparcos data
- Keyword(s): STARS: CHEMICALLY PECULIAR, STARS: FUNDAMENTAL PARAMETERS,
STARS: EARLY TYPE, STARS: DISTANCES
- Pages: 184 -- 191
Abstract:
The application of the Stromgren photometric luminosity calibrations
to different types of CP stars is reexamined in the light of the
new Hipparcos data. A first attempt is made to use the LM statistical
parallax method - based on the maximum likelihood principle - to obtain
a calibration of the absolute magnitude as a function of two Stromgren
colour indices, thus reflecting effective temperature and evolution.
Its application to a sample of Si stars and to a sample of normal main
sequence stars in the same spectral range allows us to compare the
calibrations obtained and to discuss the position of Si stars in the
HR diagram. Additionally, a sample of "bonafide", spectroscopically
selected Am stars together with normal main sequence stars are used to
derive a new absolute magnitude calibration for late A-type main sequence
stars, taking into account the effects of evolution, metallicity
and stellar rotation.
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