Search
Now showing items 1-6 of 6
An extensive search for rapid optical variability in ultracool dwarfs
(Oxford University Press, 2013)
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 itwas rapidly variable. ...
Improved SAAO–2MASS photometry transformations
(Oxford University Press, 2007)
Near-infrared photometry of 599 stars is used to calculate transformations from the South
African Astronomical Observatory (SAAO) JHK system to the Two-Micron All-Sky Survey
(2MASS) JHKS system. Both several-term formal ...
Correcting CCD photometry of stars for seeing effects
(Oxford Univeristy Press, 2009)
Systematic variability in stellarmagnitudes, as derived from profile fitting to CCD images,may
in some instances be due to variable seeing. It is suggested that this happens in cases where the
stars are unresolved pairs, ...
Linking multi-epoch CCD photometry of partially overlapping fields
(Oxford University Press, 2013)
A common problem in CCD photometry is to combine measurements obtained at different
epochs. This is especially challenging if the fields only overlap partially, and are sparse, so
that not all calibrating stars are ...
JHKs time-series observations of a few ultracool dwarfs
(Oxford University Press, 2005)
The M8.5 object SSSPM J0109−5101 has recently been shown to be both a periodic and a
flaring variable, based on optical observations in the extreme red. More than 16 h of monitoring
in the near-infrared (NIR) reported ...
UBV(RI)C photometry of transiting planet hosting stars
(Oxford University Press, 2011)
We present new UBV(RI)C photometry of 22 stars that host transiting planets, 19 of which
were discovered by the Wide Angle Search for Planets (WASP) survey. We use these data
together with Two Micron All Sky Survey (2MASS) ...