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On the Carbon-Star Status of Five Stars in a New Carbon Star Catalog

On the Carbon-Star Status of Five Stars in a New Carbon Star Catalog
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摘要 We find that five sources listed in the new carbon star catalog are not really carbon-rich objects but oxygen-rich stars, because they all have the prominent 10μm silicate features in absorption and the 1612 MHz OH maser emission or/and the SiO molecular features. These objects were considered as carbon stars in the catalog based only on their locations in the infrared two-color diagram. Therefore to use the infrared two-color diagram to distinguish carbon-rich stars from oxygen- rich stars must be done with caution, because, in general, it has only a statistical meaning. We find that five sources listed in the new carbon star catalog are not really carbon-rich objects but oxygen-rich stars, because they all have the prominent 10μm silicate features in absorption and the 1612 MHz OH maser emission or/and the SiO molecular features. These objects were considered as carbon stars in the catalog based only on their locations in the infrared two-color diagram. Therefore to use the infrared two-color diagram to distinguish carbon-rich stars from oxygen- rich stars must be done with caution, because, in general, it has only a statistical meaning.
出处 《Chinese Journal of Astronomy and Astrophysics》 CSCD 北大核心 2002年第2期169-173,共5页 中国天文和天体物理学报(英文版)
关键词 stars: AGB─ stars: carbon─infrared: stars stars: AGB─ stars: carbon─infrared: stars
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