Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999javso..27...37o&link_type=abstract
The Journal of the American Association of Variable Star Observers, vol. 27, no. 1, p. 37-40
Astronomy and Astrophysics
Astrophysics
Photometry
Scientific paper
Among the discoveries reported by the Hipparcos team was the detection of short-term photometric fluctuations in several long period, or Mira, variables (de Laverny et al. 1998). Nearly 15 percent of the 250 Miras surveyed in the broadband 380 to 800 nm filter showed variation of 0.2 to 1.1 magnitudes on timescales of 2 to 100 hours, preferentially around minimum light phases. We have begun an observational effort to confirm these variations. We seek to correlate the behavior with ancillary information, such as optical and infrared spectra plus maser data, to determine whether the fluctuations can be understood as thermal instabilities or so-called molecular catastrophe (cf. Muchmore et al 1987; Stencel et al. 1990). A progress report and call for observation coordination are given.
Ostrowski Therese A.
Stencel Robert E.
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