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 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:
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RA (2000) DE Designation(s)
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12 33 17.5 +09 01 14 FL Vir = Wolf 424
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 58 98 U-filter flare characteristics for FL Vir
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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)
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Note (1): logEu=0.98log(N/T)+26.43 where N is the number of flare
and T is the observing time in seconds.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 18-Oct-2006