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J/other/NewA/13.133    2MASS photometry of cataclysmic variables     (Ak+, 2008)

Spatial distribution and galactic model parameters of cataclysmic variables. Ak T., Bilir S., Ak S., Eker Z. <New Astron., 13, 133-143 (2008)> =2008NewA...13..133A
ADC_Keywords: Stars, variable ; Binaries, cataclysmic ; Novae ; Photometry, infrared Keywords: stars: cataclysmic binaries - stars: statistics - stars: luminosity function - Galaxy: solar neighbourhood 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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 68 459 Main catalogue data
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) V/123 : Catalog of Cataclysmic Variables (Downes+ 2001-2006) J/ApJ/565/511 : Cataclysmic variables in the 2MASS 2IDR (Hoard+, 2002) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 A10 -- Name Object name (1) 12- 13 A2 -- Type Subgroup (2) 15- 21 F7.5 d Per Orbital period 23- 25 I3 deg GLON Galactic longitude 27- 29 I3 deg GLAT Galactic latitude 31- 35 F5.3 mag E(B-V) Colour excess 38- 43 F6.3 mag Jmag ?=- 2MASS J magnitude 45- 50 F6.3 mag J-H ?=- 2MASS (J-H) colour index 52- 57 F6.3 mag H-Ks ?=- 2MASS (H-Ks) colour index 59- 63 F5.2 mag JMAG Absolute magnitude in J band 65- 68 I4 pc Dist Distance from the calibration equation
Note (1): CDS note: In original table, J1427-0123 had the photometry of V895 Cen. The photometric values of Jmag, J-H and H-Ks were taken off the table for this object. JMAG and Dist should be taken with caution. Note (2): Subgroup as follows: DN = Dwarf nova NL = Nova-like CV = Cataclysmic variables N = Nova NR = Recurrent nova
Acknowledgements: Tansel Ak, tanselak(at)
(End) Patricia Vannier [CDS] 29-Aug-2007
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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