SIMBAD references

2013MNRAS.428.2824K - Mon. Not. R. Astron. Soc., 428, 2824-2839 (2013/February-1)

An extensive search for rapid optical variability in ultracool dwarfs.


Abstract (from CDS):

In this paper, a summary of optical time-series photometry of 125 ultracool dwarfs is given. The observing strategy was to monitor each object continuously for 2-3 h in order to ascertain whether it was rapidly variable. Many of the targets were observed at multiple epochs, to follow up possible short time-scale variability, or to test for slow brightness changes on longer time-scales. The 353 data sets obtained contain nearly 22000 individual measurements. Optical (IC) magnitudes, accurate to roughly 0.1-0.2 mag, were derived for 21 objects for which there is no optical photometry in the literature. It is shown that photometry is affected by variable seeing in a large percentage of the time-series observations. Since this could give the appearance of variability intrinsic to the objects, magnitudes are modelled as functions of both time and seeing. Several ultracool dwarfs which had not been monitored before are variable, according to certain model-fitting criteria. A number of objects with multi-epoch observations appear to be variable on longer time-scales. Since testing for variability is far from being straightforward, the time-series data are made available so that interested readers can perform their own analyses.

Abstract Copyright: © 2012 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society (2012)

Journal keyword(s): techniques: photometric - brown dwarfs - stars: low-mass

VizieR on-line data: <Available at CDS (J/MNRAS/428/2824): table1.dat table2.dat phot/*>

CDS comments: p.2829: 1534-3952 is a misprint for 1534-2952. p.2833: 1539-2952 is a probable misprint for 1539-0520. DENIS-P J145407.8-640447 is a misprint for DENIS-P J145407.8-660447. SSSPM 0828-1309 is SSSPM J0829-1309. SSSPM J0123-4240 is SSSPM J0124-4240.

Simbad objects: 133

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