Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...213..204h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 213, no. 1-2, April 1989, p. 204-208. Research sponsored by the Observatorio I
Astronomy and Astrophysics
Astrophysics
11
Barium, G Stars, Infrared Radiation, K Stars, Late Stars, Binary Stars, Cosmic Dust, Spectral Energy Distribution, Stellar Atmospheres, Stellar Envelopes
Scientific paper
Some barium stars show large excesses at 10 microns. These excesses appear unrelated to other atmospheric broadband characteristics, and are strongly indicative of circumstellar dust. This supports theories that previous mass transfer in an evolved binary system may be responsible for their spectral peculiarities. Spectral energy distributions of barium stars indicate that other broadband peculiarities are likely as follows: strong deficiencies exist in the regions of the B and I filters, while weak excesses appear in the H and M spectral regions. These peculiarities appear to correlate with the barium intensity. Energy exceses are insufficient to balance deficiencies unless either (1) the V band itself represents an excess, or (2) there are additional excesses at shorter wavelengths. The precise atmospheric phenomenon leading to such deviation from a blackbody spectral distribution is unknown.
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