Velocity Observations of Multiple Mode AGB Variable Stars

Details Velocity Observations of Multiple Mode AGB Variable Stars Velocity Observations of Multiple Mode AGB Variable Stars

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12.1069f&link_type=abstract

The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August

Astronomy and Astrophysics

Astrophysics

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Scientific paper

Numerous infrared spectroscopic observations were obtained of eight AGB field M giants that have multiple periods of light variability. Each semiregular variable has light changes with a short period of several months, which is typical of low-amplitude pulsation for stars on the AGB, as well as a long period of 1-3 years. For six of the eight giants we found radial-velocity periods that confirm the long-period light variability. Those periods are significantly longer than the predicted fundamental-mode pulsations for these stars. Although we consider the possibility that the velocity variations result from orbital motion, we conclude that the long-period velocity changes in most, if not all of our sample stars, likely result from pulsation rather than duplicity. The location of these stars in the AGB period-luminosity relation is discussed.

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