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Paper text:
cvs have been `` traditionally '' observed primarily at short wavelengths because accretion - generated luminosity , which peaks in the optical  ultraviolet , dominates the radiated energy of most systems .
hence , relatively little is known about their infrared ( ir ) properties .
investigating cvs in the ir contributes to the understanding of system components that are expected to radiate at these wavelengths , such as the cool outer disk , accretion stream , and secondary star . in @xcite
, we presented an initial study of the group ir properties of cvs using the 2mass 2nd incremental data release ( 2idr ) , drawn from 525 valid targets located in the 2idr sky coverage .
we present here the preliminary results obtained from extending this study to the 2mass asdr .
our input target list for the 2mass asdr consisted of the 1320 valid cvs listed in @xcite as of 02 february 2004 .
each cv was securely identified using optical finding charts from @xcite and/or other literature sources before matching it to an object in the 2mass asdr images and point source catalog .
we could not recover the cv for 239 targets ( typically cvs in crowded star clusters , old novae near the galactic plane , etc . ) and could not securely identify the ir counterpart for 104 ( typically in regions where the ir field is very crowded ) .
the locations of another 376 cvs were securely identified , but these systems were too faint to be detected by 2mass .
the remaining 601 cvs were detected by 2mass ; of these , we classify 362 as `` good '' detections ( @xmath3 uncertainties less than 0.1 mag for @xmath0 , @xmath1 , and @xmath2 ) , 165 as `` moderate '' detections ( @xmath3 uncertainty larger than 0.1 mag for at least one of @xmath0 , @xmath1 , or @xmath2 ) , and 74 as `` poor '' detections ( lacking a formal uncertainty for at least one of @xmath0 , @xmath1 , or @xmath2 , indicating that the target is near the 2mass faint detection limit ) .
figure [ fig1 ] ( left ) shows the ir color - color diagram of all `` good '' cv detections from 2mass .
the loci of the main sequence ( ms ) , l dwarfs , and giant stars are shown as cross - hatched regions labelled with spectral types ( offset horizontally ) in normal ( ms , l dwarfs ) and italic ( giants ) fonts . the cvs located in outlying color regions ( e.g. , l dwarf region , lower right quadrant , etc . )
may be mis - identified non - cvs or potentially interesting systems .
figure [ fig1 ] ( right ) shows the ir color - magnitude diagram for cvs with distances determined from trigonometric parallax ( e.g. , @xcite ; etc . ) .
the object closest to the l dwarf region is ef eri , a cv that is believed to contain a brown - dwarf - like secondary star @xcite .
we are currently updating the input target sample to include all cvs in @xcite up to 01 september 2004 for final analysis of the ir properties of cvs , to appear in a future publication .
we present results from our analysis of the near - infrared ( @xmath0 , @xmath1 , and @xmath2 ) photometry for all cataclysmic variables ( cvs ) from the catalog of @xcite that are detected in the ( final ) all sky data release ( asdr ) from the two micron all sky survey ( 2mass ) .