Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
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PROPERTIES OF OH, SIO, AND H2O MASER EMISSION IN O-RICH AGB STARS

  • Kwon, Young-Joo (Department of Astronomy and Space Science, Chungbuk National University) ;
  • Suh, Kyung-Won (Department of Astronomy and Space Science, Chungbuk National University)
  • Received : 2012.10.03
  • Accepted : 2012.10.22
  • Published : 2012.12.31
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Abstract

We investigate the properties of OH, SiO, and $H_2O$ maser emission in O-rich AGB stars. We use a sample of 3373 objects, which is an updated version of the list of O-rich AGB stars presented in Suh & Kwon (2011). We divide the 3373 O-rich AGB stars into four different groups based on the maser emission: OH maser sources (1533), SiO sources (1627), $H_2O$ sources (452), and sources with no maser (610). To understand the nature of the maser sources, we present various infrared two-color diagrams (2CDs) using IRAS, 2MASS, and AKARI data. For each group, we compare the positions on various infrared 2CDs with theoretical models. We find that the OH maser sources generally show larger color indices and larger dust optical depths than SiO or $H_2O$ sources. We suggest that the differences of the color indices for different maser sources are due to different mass-loss rates and dust formation processes.

Keywords

Acknowledgement

Supported by : Chungbuk National University

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