SIMBAD references

2007MNRAS.382.1279P - Mon. Not. R. Astron. Soc., 382, 1279-1288 (2007/December-2)

The space density of cataclysmic variables: constraints from the ROSAT North Ecliptic Pole survey.

PRETORIUS M.L., KNIGGE C., O'DONOGHUE D., HENRY J.P., GIOIA I.M. and MULLIS C.R.

Abstract (from CDS):

We use the ROSAT North Ecliptic Pole (NEP) survey to construct a small, but purely X-ray flux-limited sample of cataclysmic variable stars (CVs). The sample includes only four systems, two of which (RX J1715.6+6856 and RX J1831.7+6511) are new discoveries. We present time-resolved spectroscopy of the new CVs and measure orbital periods of 1.64±0.02 and 4.01±0.03h for RX J1715.6+6856 and RX J1831.7+6511, respectively. We also estimate distances for all the CVs in our sample, based mainly on their apparent brightness in the infrared. The space density of the CV population represented by our small sample is 1.1+2.3–0.7x10–5/pc3. We can also place upper limits on the space density of any subpopulation of CVs too faint to be included in the NEP survey. In particular, we show that if the overall space density of CVs is as high as 2x10–4/pc3 (as has been predicted theoretically), the vast majority of CVs must be fainter than LX≃ 2x1029erg/s.

Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS

Journal keyword(s): binaries: close - stars: dwarf novae - novae, cataclysmic variables

Simbad objects: 10

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2007MNRAS.382.1279P and select 'bookmark this link' or equivalent in the popup menu


2020.10.31-03:18:21

© Université de Strasbourg/CNRS

    • Contact