Identification of the 1600A feature in Lambda Bootis stars

Details Identification of the 1600A feature in Lambda Bootis stars Identification of the 1600A feature in Lambda Bootis stars

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...290l..21h&link_type=abstract

Astronomy and Astrophysics 290L, L21-L24 (1994)

Astronomy and Astrophysics

Astrophysics

27

Stars: Atmospheres, Stars: Early-Type, Stars: {Lambda} Bootis

Scientific paper

The nature of the absoprtion feature near 1600A in λ Bootis stars, which is one of the strongest features in these objects, is a longstanding puzzle. In this study we demonstrate that it is caused by quasimolecular absorption leading to a satellite in the Lyman α profile due to perturbations by neutral hydrogen. This feature has also been observed in the hydrogen-rich DA white dwarfs. The satellite is not observable in normal A stars because of the extremely strong distortion of the UV flux by metal lines, especially of C, Si, and Fe. Although the C abundance seems to be close to solar in λ Bootis stars, the Si, Fe, and other metal abundances are sufficiently reduced to make the feature visible. For the same reason the feature is conspicuous in metal-deficient horizontal branch stars of spectral type A.

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