Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ap.....40..237o&link_type=abstract
Astrophysics, Volume 40, Issue 3, pp.237-243
Astronomy and Astrophysics
Astrophysics
2
A Stars: Infrared Surveys, A Stars: Circumstellar Dust, Rotating Stars: Circumstellar Dust
Scientific paper
IRAS data on 13 normal and 4 shell A stars are analyzed to detect circumstellar matter around them. Most of the stars rotate rapidly; five of them have been studied before. By comparing the observed fluxes, IUE and ground-based, with Kurucz’s models in the 0.17-0.9 µm range, the stars’ parameters were determined (T_{ hbox{midkern -1emlower .5em leftarrow}} g_{ hbox{midkern -1emlower .5em leftarrow}} , and angular diameter), which were used to find the IR flux excesses over the photospheric emission. Infrared excesses were found in 15 of the stars. The excesses themselves are interpreted as thermal emission from dust particles with an effective temperature in the range from 70 to 200 K. The effective radius of the circumstellar disk is estimated to be from 7 to 400 R*,
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