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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Superhumps in Cataclysmic Binaries. XXV. q
crit
, ε(q), and mass-radius
Publications of the Astronomical Society of the Pacific, Volume 117, No. 837, Year 2005
Notification
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Description
We report on successes and failures in searching for positive superhumps in cataclysmic variables, and show the superhumping fraction as a function of orbital period. Basically, all short-period system do, all long-period systems do not, and a 50% success rate is found at Porb = 3.1 ± 0.2 hr. We can use this to measure the critical mass ratio for the creation of superhumps. With a mass-radius relation appropriate for cataclysmic variables, and an assumed mean white-dwarf mass of 0.75 M⊙, we find a mass ratio qcrit = 0.35 ± 0.02. We also report superhump studies of several stars of independently known mass ratio: OU Vir, XZ Eri, UU Aqr, and KV UMa ( = XTE J1118+480). The latter two are of special interest, because they represent the most extreme mass ratios for which accurate superhump measurements have been made. We use these to improve the ε(q) calibration, by which we can infer the elusive q from the easy-to-measure ε (the fractional period excess of Psuperhump over Porb). This relation allows mass and radius estimates for the secondary star in any cataclysmic variable (CV) showing superhumps. The consequent mass-radius law shows an apparent discontinuity in radius near 0.2 M⊙, as predicted by the disrupted magnetic braking model for the 2.1-2.7 hr period gap. This is effectively the "empirical main sequence" for CV secondaries. © 2005. The Astronomical SoCciety of the Pacific. All rights reserved.
Authors & Co-Authors
Patterson, Joseph O.
United States, New York
Columbia University
Kemp, Jonathan D.
United States, New York
Columbia University
United States, Honolulu
University Hawaii Institute for Astronomy
Chile, La Serena
Cerro Tololo Inter American Observatory
Harvey, David A.
United States, Tucson
Cba West
Fried, Robert E.
United States, Orderville
Braeside Observatory
Rea, Robert D.
New Zealand, Nelson
Cba Nelson
Monard, Berto L.A.G.
South Africa, Western Cape
Cba Pretoria
Cook, Lewis M.
United States, Concord
Cba Concord
Skillman, David R.
United States, Laurel
Cba East
Vanmunster, Tonny
Unknown Affiliation
Bolt, Greg
Australia, Perth
Cba Perth
Armstrong, E.
United States, New York
Columbia University
United States, La Jolla
University of California, San Diego
McCormick, Jennie M.
New Zealand, Auckland
Cba Pakuranga
Krajci, Thomas
United States, Albuquerque
Cba new Mexico and Uzbekistan
Jensen, Lasse Teist
Unknown Affiliation
Gunn, Jerry
United States
Cba Illinois
Butterworth, Neil D.
Australia
Cba Townsville
Foote, Jerry L.
United States, Kanab
Cba–utah
Bos, Marc
New Zealand, Auckland
Cba Otahuhu
Masi, Gianluca
Italy, Lecco
Cba
Warhurst, Paul
New Zealand, Auckland
The University of Auckland
Statistics
Citations: 35
Authors: 20
Affiliations: 19
Identifiers
Doi:
10.1086/447771