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TWINKLING STARS The disappearing SiO masers of W Aql

S. Ramstedt ; Wouter Vlemmings (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; S. Mohamed ; Y.K. Choi ; Hans Olofsson (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium)
Proceedings of the International Astronomical Union; Cosmic Masers - from OH to Ho (1743-9213). Vol. 8 (2012), S287, p. 206 - 261.
[Konferensbidrag, övrigt]

W Aql is a binary S-type AGB star showing SiO maser emission. The dust distribution around the star is asymmetric, possibly indicating gravitational interaction between the binary pair. There are indications that the gas distribution also exhibits asymmetries. To investigate the source of the circumstellar structures, we applied for and were rewarded VLBI time to map the distribution of the SiO masers around this source and to constrain the presence and distribution of a possible magnetic field. Using VERA observations we also aim at measuring an accurate parallax to determine the binary separation, however, from showing peak emission of 21 Jy in June 2010, the SiO(1-0) v=1 line at 43 GHz has now disappeared. We find no correlation with the stellar pulsational period.

Nyckelord: masers; stars: AGB and post-AGB; stars: mass loss

Sofia Ramstedt, Wouter Vlemmings, Shazrene Mohamed, Yoon Kyung Choi and Hans Olofsson (2012). TWINKLING STARS The disappearing SiO masers of W Aql. Proceedings of the International Astronomical Union, 8, pp 260-261 doi:10.1017/S1743921312007107

Denna post skapades 2012-11-01. Senast ändrad 2014-09-02.
CPL Pubid: 165369