| Issue |
A&A
Volume 372, Number 1, June II 2001
|
|
|---|---|---|
| Page(s) | 245 - 248 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20010508 | |
| Published online | 15 June 2001 | |
Infrared properties of barium stars*
Yunnan Observatory & United Laboratory of Optical Astronomy, CAS, Kunming 650011, PR China
Received:
25
September
2000
Accepted:
29
November
2000
We present the results of a systematic survey for IRAS associations of barium
stars. A total of 155 associations were detected, and IRAS low-resolution
spectra exist for 50 barium stars. We use different color-color diagrams from
the visual band to 60 μm, relations between these colors and the spectral
type, the barium intensity, and the IRAS low-resolution spectra to discuss
physical properties of barium stars in the infrared. It is confirmed that most
barium stars have infrared excesses in the near infrared. However, a new result
of this work is that most barium stars have no excesses in the far infrared.
This fact may imply that infrared excesses of barium stars are mainly due to the
re-emission of energy lost from the Bond-Neff depression. It is also shown that
the spectral type and the barium intensity of barium stars are not correlated
with infrared colors, but may be correlated with 
color.
Key words: stars: late-type / infrared: stars / stars: chemically peculiar
© ESO, 2001
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