Chemically peculiar stars and their temperature calibration
| Autor: | Martin Netopil, Swetlana Hubrig, Ernst Paunzen, H. M. Maitzen, Pierre North |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
FOS: Physical sciences
Dao Spectrograms Astrophysics 01 natural sciences Photometry (optics) techniques: photometric Elemental Abundance Analyses Optical-Region Fluxes 0103 physical sciences Bolometric correction Calibration Magnetic Cp-Stars 010303 astronomy & astrophysics Physics methods: statistical Helium-Weak Star 010308 nuclear & particles physics Ap-Stars Astrophysics (astro-ph) Infrared Flux Method Astronomy and Astrophysics Roap Stars Effective temperature stars: chemically peculiar B-Type Stars Stars Space and Planetary Science Upper Main-Sequence stars: fundamental parameters |
| Popis: | The determination of effective temperature for chemically peculiar (CP) stars by means of photometry is a sophisticated task due to their abnormal colours. Standard calibrations for normal stars lead to erroneous results and, in most cases corrections are necessary. In order to specify appropriate corrections, direct temperature determinations for 176 objects of the different subgroups were collected from the literature. This much larger sample than in previous studies therefore allows a more accurate investigation, mostly based on average temperatures. For the three main photometric systems (UBV, Geneva, Stromgren uvbybeta), methods to determine effective temperature are presented together with a comparison with former results. Based on the compiled data we provide evidence that He (CP4) objects also need a considerable correction, not noticed in former investigations due to their small number. Additionally, a new relation for the bolometric correction and the capability of standard calibrations to deduce interstellar reddening for magnetic CP stars are shown. 15 pages, 8 figures, accepted by A&A |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|