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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 68 459 Main catalogue data
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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
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Bytes Format Units Label Explanations
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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
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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
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Acknowledgements:
Tansel Ak, tanselak(at)istanbul.edu.tr
(End) Patricia Vannier [CDS] 29-Aug-2007