Oral Presentation
A census of mass-losing long period variables showing SiO masers in the direction of the Galactic Nuclear Star Cluster with ALMA Band 1
Presenter: Hideyuki Izumiura (Okayama Astrophysical Observatory, NAOJ, NINS)
A census of mass-losing long period variables that are showing SiO masers lying in the area of 10'x10' in the direction of the Galactic Nuclear Star Cluster is proposed, exploiting the Band 1 capability of ALMA. The results will be discussed in terms of distribution, kinematics, and detection probability of the SiO-detected soruces, with the aid of the variable star catalog by Matsunaga et al. (2009), which gives the variation period, luminosity, and colors of infrared sources in that region. A comparison will also be made between the SiO maser sources and the previously known OH/IR stars in that region. Maser properties in asymptotic giant branch (AGB) stars in such a harsh and metal-rich environment as the Nuclear Star Cluster of the Galaxy will be revealed. The differences among sources exhibiting SiO only, OH maser only, both, and neither will be investigated, which could lead to a further comprehensive understanding of the mass-loss in AGB stars.
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