Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aj....121..517f&link_type=abstract
The Astronomical Journal, Volume 121, Issue 1, pp. 517-524.
Astronomy and Astrophysics
Astronomy
8
Stars: Flare, Surveys
Scientific paper
A set of four test regions covering a total celestial area of 520 deg2 at low galactic latitude is investigated on a set of 130 century-old astrographic plates. About 8% of the 2×105 stars with apparent B magnitude 10-14 and with total proper-motion component larger than 0.02" yr-1 show a significant flickering greater than 0.4 mag in B over a timescale shorter than 20 minutes. About 25% of these stellar flare candidates concern stars with B-V~0.2 (spectral type A7). A procedure to select pre-main-sequence stellar candidates from the distance-limited sample of 16×103 disk dwarfs with detected flickering in B magnitude >=0.4 is presented in view of a mass loss of 10-8 Msolar yr-1, derived from the analysis of the angular momentum distribution of stellar orbits. Follow-up UBV photoelectric photometry at the present epoch of 200 nearby stellar flares along the Vulpecula Rift shows an effect of reddening in B-V and of blueing in U-B for about 10% of the targets. The detection of optically thin or thick disks around the selected targets is suggested. The success rate in detecting optical flares in nearby stars of ~1.5 Msolar with as much as 5×10-6 Msolar dumped onto the central star during the past 100 years, from deep astrographic plates coupled with 1 m-class telescope is estimated to 10% with a kinematical bias that can be dealt with.
Argyle Robert W.
Fresneau Alain
Marino Gianluca
Messina Sergio
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