Fast UBVRI colorimetry of stellar flares on EV Lacertae

Details Fast UBVRI colorimetry of stellar flares on EV Lacertae Fast UBVRI colorimetry of stellar flares on EV Lacertae

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003kfnts...4...30z&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, Suppl, no. 4, p. 30-35

Physics

1

Scientific paper

Here we report first results of colorimetric analysis of the flare star EV Lac based on the UBVRI data obtained during the course of many-site synchronous monitoring in 1998 September. The color characteristics of flares and small-scale high-frequency oscillations (HFO) recently discovered are in the focus of this work. Colorimetric analysis had been performed with the help of color time tracks, as from the earliest phase of the flare development. This technique is illustrated by theexample of a relatively strong flare event of EV Lac on September 11, 1998. The digital filtering technique was used to evaluate: 1) the color indices of both the main flare light curves and HFO, 2) their time behavior during the flare lifetime. It is found that the color indices of the main outburst light curves differ significantly from those of rapid oscillations. The first shows smooth forms. In contrast to this, the corresponding HFO indices are greatly variable, in particular for the ascending part of a burst. On account of HFO the flare color oscillates from deep red to extremely blue on a time scale of seconds. When the flare grew to Delta U ≃ - 0.8 mag, color tracks were evolved into the region of color-color diagrams occupied by hydrogen plasma which is optically thick at the Balmer continuum.

Affiliated with

Also associated with

No associations

Rating

Fast UBVRI colorimetry of stellar flares on EV Lacertae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Fast UBVRI colorimetry of stellar flares on EV Lacertae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fast UBVRI colorimetry of stellar flares on EV Lacertae will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1540033