Astronomy and Astrophysics – Astronomy
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sass...23...71m&link_type=abstract
The Society for Astronomical Sciences 23rd Annual Symposium on Telescope Science, held May 26-27, 2004, at Big Bear, CA. Publish
Astronomy and Astrophysics
Astronomy
Scientific paper
We have been monitoring Mira variable stars, which encompass spectroscopic classes of type M, S and C during the past year and a half. These stars are closely related in terms of their long term variability, position on the Hertzsprung-Russell diagram their intermediate mass (from ~0.8 to ~8 solar mass) and the fact that class M evolves into the S and C type stars. These stars are very interesting from the stand point that they can produce heavy elements beyond iron and also carbon which can appear at the surface of these stars during periods in their evolution. In addition, it is suspected that these type stars, in particular, the M type Mira's can flare up over periods of hours to days by several tenths of a magnitude or more. The spectroscopic changes, which occur during these flare episodes, ultimately driven by core burning evolution, remain relatively unexplored. This project was initiated in order to monitor a group of program stars of these classes in the V and R photometric bands in the hopes of catching some of these stars during one of these flare ups and thus to be able to conduct spectral analysis of the flare-ups in real time and compare these spectra to the non-flare spectra. This paper will give an update of the project and describe the strategies being employed to monitor these stars.
Mais Dale E.
Richards David
Stencel Robert E.
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