Absolute Magnitudes of Chemically Peculiar Stars

Details Absolute Magnitudes of Chemically Peculiar Stars Absolute Magnitudes of Chemically Peculiar Stars

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..239n&link_type=abstract

Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 239-244

Physics

32

Scientific paper

The position of different kinds of CP stars of the upper Main Sequence (i.e. Am stars and the four categories of Ap stars: He-weak, HgMn, Si and SrCrEu) in the HR diagram is examined. Using only those stars having a parallax with a relative error smaller than 0.14 (sigma (M_v) =< 0.3) and an absolutely certain peculiarity, it is shown that their absolute magnitudes are similar to those obtained from CP stars in clusters. CP stars are scattered on the whole width of the Main Sequence band. However, the rapidly oscillating Ap stars seem slightly less evolved, hence less massive as a group, than their non-oscillating counterparts. The calibrations of the Stroemgren and Geneva indices in terms of M_v have been reexamined in the light of the Hipparcos data for Am stars. A new calibration of the uvby-beta system in absolute magnitude is proposed for both normal and Am stars. The calcium abundance in Am stars is examined as a function of their evolutionary state.

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