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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The space density of cataclysmic variables: Constraints from the ROSAT North Ecliptic Pole survey
Monthly Notices of the Royal Astronomical Society, Volume 382, No. 3, Year 2007
Notification
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Description
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 ± 0.03 h 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+2.3-0.7 × 10-5 pc-3. 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 2 × 10 -4 pc-3 (as has been predicted theoretically), the vast majority of CVs must be fainter than LX ≃ 2 × 10 29 erg s-1. © 2007 The Authors. Journal compilation © 2007 RAS.
Authors & Co-Authors
Pretorius, Magaretha L.
United Kingdom, Southampton
University of Southampton
Knigge, Christian
United Kingdom, Southampton
University of Southampton
O'Donoghue, Darragh E.
South Africa, Cape Town
South African Astronomical Observatory
Henry, J. Patrick
United States, Honolulu
University Hawaii Institute for Astronomy
Gioia, I. M.
Italy, Rome
Consiglio Nazionale Delle Ricerche
Mullis, Christopher R.
United States, Ann Arbor
University of Michigan, Ann Arbor
Statistics
Citations: 44
Authors: 6
Affiliations: 5
Identifiers
Doi:
10.1111/j.1365-2966.2007.12461.x
ISSN:
00358711
e-ISSN:
13652966
Study Design
Cross Sectional Study
Study Approach
Quantitative