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Astron. Astrophys. 333, 613-618 (1998)

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Research Note

Infrared study of the two categories of S stars

P.S. Chen 1, 2, X.H. Wang 1, 2 and G.Z. Xiong 1, 2

1 Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming 650011, P.R. China (ynao@public.km.yn.cn)
2 United Laboratory for Optical Astronomy, Chinese Academy of Sciences, P.R. China

Received 30 January 1997 / Accepted 5 January 1998


Photometric observations of 20 Tc-deficient and 24 Tc-rich S stars in the near infrared are presented in this paper. With the IRAS data, infrared two color diagrams, IRAS low-resolution spectra and energy distributions are discussed to summarize the way to segregate Tc-rich stars from Tc-deficient ones.

Key words: circumstellar matter – stars: evolution – stars: AGB, post AGB – infrared: stars

Send offprint requests to: P.S. Chen

© European Southern Observatory (ESO) 1998

Online publication: April 20, 1998