The evolutionary status of Cataclysmic Variables: eclipse modelling of 15 systems

McAllister, M.; Littlefair, S. P.; Parsons, S. G.; Dhillon, V. S.; Marsh, T. R.; Gänsicke, B. T.; Breedt, E.; Copperwheat, C.; Green, M. J.; Knigge, C.; Sahman, D. I.; Dyer, Martin J.; Kerry, P.; Ashley, R. P.; Irawati, P.; Rattanasoon, S.
Referencia bibliográfica

Monthly Notices of the Royal Astronomical Society, Volume 486, Issue 4, p.5535-5551

Fecha de publicación:
7
2019
Número de autores
16
Número de autores del IAC
1
Número de citas
55
Número de citas referidas
44
Descripción
We present measurements of the component masses in 15 Cataclysmic Variables (CVs) - 6 new estimates and 9 improved estimates. We provide new calibrations of the relationship between superhump period excess and mass ratio, and use this relation to estimate donor star masses for 225 superhumping CVs. With an increased sample of donor masses we revisit the implications for CV evolution. We confirm the high mass of white dwarfs in CVs, but find no trend in white dwarf mass with orbital period. We argue for a revision in the location of the orbital period minimum of CVs to 79.6 ± 0.2 min, significantly shorter than previous estimates. We find that CV donors below the gap have an intrinsic scatter of only 0.005 R⊙ around a common evolutionary track, implying a correspondingly small variation in angular momentum loss (AML) rates. In contrast to prior studies, we find that standard CV evolutionary tracks - without additional AML - are a reasonable fit to the donor masses just below the period gap, but that they do not reproduce the observed period minimum, or fit the donor radii below 0.1 M⊙.
Proyectos relacionados
Representación de la variable cataclísmica SS Cygni (Chris Moran)
Estrellas Binarias
El estudio de las estrellas binarias es una parte esencial de la astrofísica estelar. Una gran parte de las estrellas de nuestra Galaxia y de otras galaxias se ha formado en sistemas binarios o múltiples, por lo que entender la estructura y evolución de estos sistemas es importante desde el punto de vista estelar y galáctico. Un aspecto en el que
Pablo
Rodríguez Gil