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Simultaneous Observations of H2O and SiO Masers toward OH/IR Stars

• Authors: Chi-Young Cho, Se-Hyung Cho, Sungeun Kim, Jaeheon Kim, Dong-hwan Yoon, and Jihye Hwang

2017 The Astrophysical Journal Supplement Series 232 13.

• Provider: AAS Journals

Caption: Figure 7.

(a) Distributions of SiO v = 1 and/or v = 2 maser detections for both H2O and SiO maser detected OH/IR stars in the IRAS two-color diagram. The red line is the evolutionary sequence for AGB stars defined by van der Veen & Habing (1988). The blue dashed line indicates the two groups of post-AGB stars, LI (left of IRAS, blue group) and RI (right of IRAS, red group) (Sevenster 2002a). The green circles indicate both SiO v = 1 and v = 2 maser detected sources, and the yellow circles and the red circles indicate SiO v = 1-only maser detected sources and v = 2-only detected sources, respectively. (b) Distributions of the SiO v = 1 and/or v = 2 maser detections for SiO-only maser detected OH/IR stars. The green triangles indicate both SiO v = 1 and v = 2 maser detected sources, and the yellow triangles and the red triangles indicate SiO v = 1-only maser detected sources and v = 2-only detected sources, respectively.