Detection of high-frequency optical oscillation during the flare phase of EV Lac in 1999

Details Detection of high-frequency optical oscillation during the flare phase of EV Lac in 1999 Detection of high-frequency optical oscillation during the flare phase of EV Lac in 1999

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004an....325..427c&link_type=abstract

Astronomische Nachrichten, Vol.325, Issue 5, p.427-432

Astronomy and Astrophysics

Astronomy

2

Stars: Flare, Stars: Oscillations, Discrete Fourier Transform, Mhd

Scientific paper

A program of Many-sites Multi Channel simultaneous observations of flare stars by a network of telescops was initiated in 1998. The purpose of this program is to investigate the fine structure of the flares light-curve in UBVRI, depressing atmospheric and instrumental noises. In this paper we present the results of the observations on the Flare star EV Lac in the B color, which were carried out at the Stephanion observatory during the campaign of 1999. Discrete Fourier Transform analysis of the B-light curve of the largest flares reveal the presence of high frequency small amplitude oscillations with periods ranging between 6.9 sec and 20 sec in around the flare maximum phase. The oscillation amplitude ranges from 1.4 to 2.6 % of the star brightness in accordance with the results of the campaign of 1998 (Zhilyaev et al. 2000). In addition there is a tendency the higher frequencies to persist in the late phases of the flare evolution. The observations are consistent with the phenomenology of the evolution of a fast mode magneto-acoustic wave generated at the impulsive phase of the flare and traveling through the magnetic loop.

Affiliated with

Also associated with

No associations

Rating

Detection of high-frequency optical oscillation during the flare phase of EV Lac in 1999 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 Detection of high-frequency optical oscillation during the flare phase of EV Lac in 1999, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detection of high-frequency optical oscillation during the flare phase of EV Lac in 1999 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-890316