Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.134..381f&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 134, no. 2, June 1987, p. 381-403.
Astronomy and Astrophysics
Astrophysics
10
Peculiar Stars, Stellar Composition
Scientific paper
Chemically peculiar (CP) stars are mainly found among B and A stars. Present theories are not able to account fully for the observed spectrum anomalies, suggesting that in the atmospheres of stars in the range of T(e), where mass loss is no longer very large and convection is still not very important, the present theoretical approach needs further refinement. Moreover, the lack of laboratory data is responsible, at least partly, for the discrepancies between observed and computed stellar energy distributions. The choice for quick detection of CP stars among faint objects is reviewed; the measure of the flux depression at 5200 A appears to be very powerful, and the identification of this complex feature is urgently needed. The need to separate the various subclasses of the He abnormal stars in a standard way is underlined, and it is suggested that further analyses of the characteristics of the Lambda Boo stars are required. The problem of the determination of T(e), and consequently of realistic atmospheric abundance anomalies of CP stars, is discussed.
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