Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26as...81..335m&link_type=abstract
Astronomy and Astrophysics Supplement, Vol.81, NO. 3/DEC, P. 335, 1989
Astronomy and Astrophysics
Astrophysics
16
Scientific paper
We report on further photometry in order to substantiate the findings of Maitzen and Pavlovski (1989). Although the spectroscopic definition of the λ Bootis stars, a group of chemically peculiar stars (CP) with heavy element underabundances, has not yet been worked out to general satisfaction, the photometric behaviour of a sample of now 45 λ Boo objects in the Δα system (measuring the flux around λ5200) exhibits a clear trend: two thirds show moderate, but significant negative Δα-values. Thus they show an inverse behaviour in comparison with CP2 (magnetic peculiar or Ap-) stars which have positive Δα-excesses and heavy element overabundances. This opens the way to test a theory predicting underabundances as a result of diffusion plus mass loss in chemically stratified atmospheres at the end of the main sequence life time. It is proposed to search for λ Boo stars in open clusters covering a wide range of ages.
Maitzen Hans Michael
Pavlovski Kresimir
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