Abstract
We have investigated the distributions of silicon monoxide (SiO) v = 2 and v = 3 J = 1 → 0 masers around long-period variables (LPVs) in VLBI observations using the VLBI Exploration of Radio Astrometry (VERA) combined with the Nobeyama 45 m telescope. We find some examples of correlation of a maser spot distribution with the stellar light curve, which may provide a clue to elucidating the pumping mechanism of circumstellar SiO masers.
Highlights
There are three pumping models of circumstellar silicon monoxide (SiO) masers: (1) stellar radiation pumping; (2) collisional pumping; (3) line overlapping [1, 2, 3]
Observations We carried out VLBI observations of SiO v = 2 and v = 3 J = 1 → 0 masers towards 12 long-period variables (LPVs) (WX Psc, AP Lyn, U Ori, VY CMa, R Leo, RS Vir, W Hya, U Her, RU Her, V1111 Oph, V4120 Sgr, and T Cep) using four VLBI Exploration of Radio Astrometry (VERA) 20 m telescopes and the 45 m telescope of Nobeyama Radio Observatory (NRO) on March 24–25 and May 21–22 in 2012
We succeeded in superimposition of v = 2 and v = 3 maser maps toward WX Psc, R Leo, W Hya (Fig.1), and T Cep (Fig.2)
Summary
There are three pumping models of circumstellar SiO masers: (1) stellar radiation pumping; (2) collisional pumping; (3) line overlapping [1, 2, 3]. 1. Introduction There are three pumping models of circumstellar SiO masers: (1) stellar radiation pumping; (2) collisional pumping; (3) line overlapping [1, 2, 3].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
