Velocity Observations of Multiple-Mode Asymptotic Giant Branch Variable Stars

Details Velocity Observations of Multiple-Mode Asymptotic Giant Branch Variable Stars Velocity Observations of Multiple-Mode Asymptotic Giant Branch Variable Stars

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aj....123.1002h&link_type=abstract

The Astronomical Journal, Volume 123, Issue 2, pp. 1002-1012.

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40

Stars: Binaries: General, Stars: Agb And Post-Agb, Stars: Variables: Other

Scientific paper

Numerous infrared spectroscopic observations were obtained of nine asymptotic giant branch (AGB) field M giants that have multiple periods of light variability. Each star has 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 yr, which is significantly longer than the predicted fundamental-mode pulsations for these stars. The location of these stars in the AGB period-luminosity relation is discussed. For six of the nine giants we found radial-velocity periods that confirm the long-period light variability. Although we considered the possibility that the velocity variations result from orbital motion, we conclude that the long-period velocity changes in most, if not all of the sample stars, likely result from a currently unknown type of pulsation rather than duplicity.

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