T Ursae Minoris: a Mira star with rapidly decreasing period.

Details T Ursae Minoris: a Mira star with rapidly decreasing period. T Ursae Minoris: a Mira star with rapidly decreasing period.

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...297..461g&link_type=abstract

Astronomy and Astrophysics, v.297, p.461

Astronomy and Astrophysics

Astrophysics

22

Methods: Data Analysis, Stars: Agb, Stars: Individual: T Umi

Scientific paper

Light curve analysis of the Mira star T UMi showed that the period of the star strongly decreases: between JD 2440000 and 2449250 the period dropped from 314.5days to 283.2days. Comparing the results with model calculations it seems that the period decreasing of T UMi may be due to a change in luminosity resulting from a shell flash in the helium burning shell. The rate of the period variation suggests that this Mira is just after the beginning of the shell flash.

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