A new absolute magnitude calibration with 2MASS for cataclysmic variables

Abstract

Using reliable trigonometric measurements, we find that the absolute magnitude of cataclysmic variables depends on the orbital period and de-reddened $(J-H{)}_0$ and $(H-K_s{)}_0$ colours of {\em 2MASS} (Two Micron All Sky Survey) photometric system. The calibration equation covers the ranges $0.032^d<P_{orb}\le 0.454^d$, $-0.08<(J-H{)}_0\le 1.54$, $-0.03<(H-K_s{)}_0\le 0.56$ and $2.0<M_J<11.7$; It is based on trigonometric parallaxes with relative errors of $({\sigma }_{\pi }/\pi )\le 0.4$. By using the period-luminosity-colours (PLCs) relation, we estimated the distances of cataclysmic variables with orbital periods and {\em 2MASS} observations and compared them with distances found from other methods. We suggest that the PLCs relation can be a useful statistical tool to estimate the distances of cataclysmic variables.

13 pages, 2 figures and 3 tables, accepted for publication in New Astronomy

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