Other
Scientific paper
Feb 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007noao.prop...34k&link_type=abstract
NOAO Proposal ID #2007A-0034
Other
Scientific paper
A number of cataclysmic variables (CVs) show occasional large drops in their optical light curves (VY Scl low states), during which accretion ceases temporarily, revealing the two stellar components of the system. During low states of magnetic CVs, spectroscopic observations revealed prominent chromospheric activity on the mass- losing secondary stars, opening a plethora of questions on the character and nature of activity on CV secondaries, which bears on the evolution of those systems. We wish to observe a disk CV in one of those states and explore chromospheric activity on its secondary star; however we are limited by the erratic nature of the low states. This also limits our capability to study their secondary star in a mode other than a target of opportunity (ToO). We therefore propose to use the CTIO 1.3m telescope to monitor a number of disk CVs for the full semester, in order to trigger a ToO time with the VLT and obtain orbit-resolved spectra when one of these systems is in its low optical state. At the same time, we will study the long-term V and J light curves of those CVs, exploring their characteristics in the high accretion state.
Honeycutt Kent R.
Howell Steve B.
Kafka Styliani
Mason E. E.
Tappert Claus
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