Period evolution in Mira variables

Details Period evolution in Mira variables Period evolution in Mira variables

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..283...91z&link_type=abstract

In: Mass-losing pulsating stars and their circumstellar matter. Workshop, May 13-16, 2002, Sendai, Japan, edited by Y. Nakada, M

Astronomy and Astrophysics

Astrophysics

Mira Variables: Period Evolution

Scientific paper

We investigate a number of Mira variables which show evolution in their periods. Three different type of period changes are found: continuous evolution, sudden changes and meandering periods. Of the order of 1% of Miras show evidence for period changes, but unstable periods may be common among the longest period Miras. In the case of R Hya, the period change was accompanied by a dramatic change in mass-loss rate, consistent with the mass-loss formalism of Vassiliadis & Wood. Their formalism then predicts that the mass-loss rates of the longest period Miras (P>400 days) may fluctuate by a factor of 2-3 over time scales of a century.

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