In: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 38, no. 2
K. Stępień - Ł. Lipski
Detaily:
Rok, strany: 2008, 353 - 362
Kľúčové slová:
stars: chemically peculiar, stars: fundamental parameters
URL originálneho zdroja: http://www.astro.sk/caosp/Eedition/Abstracts/2008/Vol_38/No_2/pp353-362_abstract.html
O článku:
A brief discussion of earlier determinations of effective temperatures
of chemically peculiar stars is given. It is stressed that the effective
temperature is a global parameter, important for stellar structure and
evolution studies. It should, however, be used with caution in atmospheric
investigations. New determinations of effective temperatures of 27
chemically peculiar stars with characteristics typical of magnetic
variables were obtained from a root-mean-square fit of metal enhanced model
atmospheres to the observed and de-reddened, when necessary, spectral energy
distributions (SED) from UV to red. Metallicity and effective temperature
were used as fitting parameters, assuming fixed values of gravity: log
g = 4 for main sequence stars and log g = 3 for giants. Equal weights
were given to the UV and visual part of SED. The quality of fit was
checked for each star by determination of the temperature from the best
fitting model atmosphere to the UV part and to the visual part of SED
separately. Both temperatures should be close to one another if the global
best fitting model satisfactorily describes the full observed SED. This is
the case for about a half of the investigated stars but the difference
exceeds 750 K for the remaining stars with the extreme values above 2000
K. Possible reasons for such discrepancies are discussed. New, revised
calibrations of effective temperature and bolometric correction of magnetic
stars in terms of reddening free Strömgren indices are given. It is
shown that the investigated stars populate uniformly the main sequence.
Ako citovať:
ISO 690:
Stępień, K., Lipski, Ł. 2008. Effective temperatures of magnetic CP stars: semi-fundamental data. In Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 38, no.2, pp. 353-362. 1335-1842.
APA:
Stępień, K., Lipski, Ł. (2008). Effective temperatures of magnetic CP stars: semi-fundamental data. Contributions of the Astronomical Observatory Skalnaté Pleso, 38(2), 353-362. 1335-1842.