| Issue |
A&A
Volume 387, Number 1, May III 2002
|
|
|---|---|---|
| Page(s) | 129 - 138 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20020356 | |
| Published online | 15 May 2002 | |
Near-infrared observations of candidate extrinsic S stars
1
Yunnan Observatory, National Observatories, CAS, Kunming 650011, PR China
2
Joint Laboratory for Optical Astronomy, CAS, Beijing 100012, PR China
Corresponding author: X.-H. Wang, wang_xunhao@sina.com
Received:
16
May
2001
Accepted:
30
January
2002
Photometric observations in the near infrared for 161 S stars, including 18 Tc-rich (intrinsic) stars, 19 Tc-deficient (extrinsic) ones and 124 candidates for Tc-deficient S stars, are presented in this paper. Based on some further investigations into the infrared properties of both Tc-rich and Tc-deficient S stars, 104 candidates are identified as very likely Tc-deficient S stars. The large number of infrared-selected Tc-deficient S stars provides a convenient way to study the physical properties and the evolutionary status of this species of S stars.
Key words: stars: AGB and post-AGB / stars: evolution / stars: circumstellar matter / infrared: stars
© ESO, 2002
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