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J/MNRAS/368/1392     Flares of the close binary FL Vir    (Pettersen+, 2006)
Flare variability in the close binary FL Vir.
    Pettersen B.R.
   <Mon. Not. R. Astron. Soc., 368, 1392-1394 (2006)>
   =2006MNRAS.368.1392P
ADC_Keywords: Stars, flare ; Stars, double and multiple

Keywords: techniques: photometric - binaries: close - stars: flare


Abstract:
    The results of U-filter flare monitoring of the binary flare star
    FL Vir = Wolf 424 is presented. 57 flares with energies between
    2x1028 and 2x1031erg were recorded in 20h of observation. The
    properties of flare occurrence and flare time-scales are analysed, and
    the flare activity level in 1980 April is determined to be
    Lf(U)=8.0x1026erg/s. This is larger than previously published
    results and may indicate a variation in the flare activity level on a
    time-scale of years. An analysis of existing data indicates that the
    flare activity level correlates with the relative orbital positions of
    the stars.

Description:
    FL Vir = Wolf 424 = Gliese 473 AB was observed on seven nights in 1980
    April with the 2.1-m Struve reflector at McDonald Observatory. A
    computer-controlled high-speed photometer was used to collect data
    through eight filters. Here, we analyse only the U-filter data.
Objects:
    --------------------------------------------
       RA   (2000)   DE      Designation(s)
    --------------------------------------------
    12 33 17.5   +09 01 14   FL Vir = Wolf 424
    --------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        58       98   U-filter flare characteristics for FL Vir


Byte-by-byte Description of file: table2.dat

   Bytes Format Units      Label   Explanations

   1-  2  I2    ---        Seq     Flare number
       3  A1    ---        m_Seq   Multiplicity index on Flare
   5- 14  A10 "YYYY/MM/DD" Date    UT Date of the event
  16- 23  A8    "h:m:s"    Time    Time of the maximum flare (hh:mm:ss)
      25  A1    ---       l_trise  Limit flag on trise
  26- 27  I2    s          trise   ? Flare rise time
      29  A1    ---        l_t0.5  Limit flag on t0.5
  30- 33  I4    s          t0.5    ? Decay time
      35  A1    ---        l_tdur  Limit flag on tdur
  36- 39  I4    s          tdur    ? Duration time
  41- 45  F5.2  ---        Ampl    Flare amplitude
  48- 51  F4.2  ---        Noise   Noise (sigma/I0)
      53  A1    ---       l_logEu  Limit flag on logEu
  54- 58  F5.2  [10-7W]    logEu   ? Cumulative energy of flare (1)

Note (1): logEu=0.98log(N/T)+26.43 where N is the number of flare
          and T is the observing time in seconds.


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    18-Oct-2006