AAS 201st Meeting, January, 2003
Session 115. Cool Star Atmospheres and Envelopes
Poster, Thursday, January 9, 2003, 9:20am-4:00pm, Exhibit Hall AB

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[115.09] Movie and Description of the 43-GHz SiO Masers in S Per

T.A. Ostrowski-Fukuda, R.E. Stencel (University of Denver), A. Kemball (NRAO), G. Harper (CASA), P.J. Diamond (AD(MERLIN/VLBI National Facility))

The Very Long Baseline Array (VLBA) has been used to monitor the 43 GHz SiO (v=1,J=1-0) maser emission in the red supergiant star, S Persei, monthly since 1999. SiO masers act as probes of the gas motions and magnetic fields of this star allowing us to investigate its extended atmosphere. Here we report the preliminary results of this on-going project. Many epochs of data have been reduced and pieced together in a time-lapse movie fashion, allowing us to follow the motions of the individual maser regions. The motion of twenty-three maser spots are followed through the selected epochs, revealing velocity and ring structure information. Proper motions are detected by using a pairwise separation test and the average expansion velocity will be discussed. Finally, the relation between the pulsational phase of the star and the SiO maser emission will be discussed. The results of this study provide the first SiO maser movie of a red supergiant star and allow us to make a comparison between S Per, and Mira-type red giant stars, such as TX Cam. This work is supported by the University of Denver's Menzel Scholarship Fund and in conjunction with the National Radio Astronomy Observatory, Socorro, NM.

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Bulletin of the American Astronomical Society, 34, #4
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