VizieR Online Data Catalog: 2MASS photometry of cataclysmic variables (Ak+, 2008)
Abstract
Spatial distribution, galactic model parameters and luminosity function of cataclysmic variables (CVs) in the solar neighbourhood have been found using distances estimated from the period-luminosity-colours (PLCs) relation of CVs. It can be concluded that exponential function fits better to the observational z-distributions of the whole CVs in the sample, non-magnetic CVs and dwarf novae, while the sech2 function is more appropriate for nova-like stars and polars. The vertical scaleheight of CVs is 158+/-14pc for the 2MASS J band limiting apparent magnitude of 15.8. The discrepancies between the theoretical and observational population studies of CVs can be at least partly removed if the sech2 density function is used in deriving the galactic model parameters. We estimated the vertical scaleheights of 128+/-20pc and 160+/-5pc for dwarf novae and nova-like stars, respectively. The local space density of CVs is found ~3x10-5pc-3 which is in agreement with the lower limit of the theoretical predictions. The luminosity function of CVs shows a trend toward higher space density at low luminosity, implying an increase in the number of short-period systems.
(1 data file).- Publication:
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VizieR Online Data Catalog (other)
- Pub Date:
- August 2007
- Bibcode:
- 2007yCatp022001301A
- Keywords:
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- Stars: variable;
- Binaries: cataclysmic;
- Novae;
- Photometry: infrared