Short timescale variability in the faint sky variability survey
SourceMemorie della Società Astronomica Italiana, 77, 4, (2006), pp. 1179
Article / Letter to editor
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Memorie della Società Astronomica Italiana
We present the V-band variability analysis of the Faint Sky Variability Survey (FSVS). The FSVS combines colour and time variability information, from timescales of 24 minutes to tens of days, down to V = 24. We find that 1% of all point sources are variable along the main sequence reaching 3.5% variability for bluer sources above the main sequence. The total number of variables is dominated by main sequence sources. We can determine the variability timescales and amplitudes for 40% of the variable sources found. Fifty per cent of these show variability timescales shorter than 6 hours. We determine lower limits for the space density of variable point sources. We find 12 RR Lyr candidates in our survey resulting in a space density that agrees with previous determinations.
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