Investigation of micro-flaring and secular and quasi-periodic variations in dMe flare stars. VII - A revived 'planetesimal-impact' hypothesis and the young dMo.5e star, Gliese 182

Details Investigation of micro-flaring and secular and quasi-periodic variations in dMe flare stars. VII - A revived 'planetesimal-impact' hypothesis and the young dMo.5e star, Gliese 182 Investigation of micro-flaring and secular and quasi-periodic variations in dMe flare stars. VII - A revived 'planetesimal-impact' hypothesis and the young dMo.5e star, Gliese 182

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...245..219a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 245, no. 1, May 1991, p. 219-231. Research supported by Department of Educatio

Astronomy and Astrophysics

Astrophysics

5

Asteroids, Astronomical Photometry, Protoplanets, Stellar Atmospheres, Stellar Flares, Fourier Analysis, Light Curve, Periodic Variations, Secular Variations

Scientific paper

A schematic connection is made between stellar flares and planetesimal penetration and subsequent explosion within young dMe stars in an 'impact' hypothesis. It is suggested that impacts may modify the velocity spectrum in the convective motions at the footpoints of closed coronal loops, and also may induce the triggering of the flare mechanism in young dMe stars. Some relevant results from continuous photoelectric monitoring in 1981 of the young, dM0-1e flare star, Gliese 182 (= V 1005 Ori), a possible candidate to possess a planetesimal system, are presented. Using Fourier analysis techniques, it is found that the U-band light curve over 1.6 h may be accurately represented by frequency components from near zero to 16.7 mHz (down to period of 1 min). Negligible power exists beyond this upper frequency limit.

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