Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...227..456a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 227, no. 2, Jan. 1990, p. 456-464. Research supported by the Department of Edu
Astronomy and Astrophysics
Astrophysics
10
Flare Stars, M Stars, Stellar Atmospheres, Stellar Flares, Power Spectra, Stellar Color, Stellar Coronas, Ubv Spectra, X Ray Spectra
Scientific paper
The method of 'time signatures' developed in previous papers has been applied to study photometric microvariability in AT Mic immediately following a small flare. Quasi-periodic 8-s and 13-s fluctuations were detected 10-15 min after peak light. The 13-s quasi-period arises from the first half of this time interval, and has now been detected in three dMe stars, V 468 Tau, V 1285 Aql and AT Mic. These results are compared with previously reported time signatures in other flare stars. Their possible dependence on the X-ray and Mg II k-line emission line surface fluxes is investigated. For six dMe stars, an approximate power law is derived for the TS versus F(x) relation valid at the 89-percent confidence level.
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