The Time Variation in the Water Vapor Bands in Oxygen-rich Mira Variables

Details The Time Variation in the Water Vapor Bands in Oxygen-rich Mira Variables The Time Variation in the Water Vapor Bands in Oxygen-rich Mira Variables

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001assl..265..433m&link_type=abstract

Post-AGB Objects as a Phase of Stellar Evolution, Proceedings of the Toruń Workshop held July 5-7, 2000. Edited by R. Szczerba a

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

We examine the time variation in the near-infrared H2O bands in oxygen-rich Mira variables. We analyzed four Mira variables, which were monitored for longer than one period of their optical light curves with the ISO/SWS. In the wavelength range from ~3.5 to 4.0 microns, all of the sample stars show absorption features of H2O bands around minima and emission features around maxima. The model analysis shows that the H2O layer with an excitation temperature of ~2000 K is responsible for these features and that the layer is located at about 1 stellar radius around minima, and expands to about 2 stellar radii around maxima. These results are explained by either the dynamical motion of the matter in the extended atmosphere, or the variation of the temperature structure in the extended atmosphere through the shocks caused by the pulsation.

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