Detection of short-term variations in Mira-type variables from HIPPARCOS photometry

Details Detection of short-term variations in Mira-type variables from HIPPARCOS photometry Detection of short-term variations in Mira-type variables from HIPPARCOS photometry

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...330..169d&link_type=abstract

Astronomy and Astrophysics, v.330, p.169-174 (1998)

Astronomy and Astrophysics

Astrophysics

21

Stars: Variables, Stars: Late-Type, Stars: Agb And Post-Agb

Scientific paper

The Hipparcos photometric observations carried out over 37 months have been investigated in detail for ~ 250 Miras. This leads to an unexpected by-product of the mission that we already suspected from ESOC real-time reductions: the first detection from space of photometric short-term brightness variations in Mira-type variables. Altogether, 51 events in 39 M-type Miras are detected and no similar variations are found for S and C-type Miras. Their amplitude ranges from 0.23 mag up to 1.11 mag and their duration extends from 2 hours up to almost 6 days. These events seem to occur preferentially in late spectral types. We suggest that they might be related to molecular opacity effects. Based on data from the \HIP astrometry ESA satellite

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