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20 April 2024 |
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MOCCA-SURVEY database I. Accreting white dwarf binary systems in globular clusters -- II. Cataclysmic variables -- progenitors and population at birth | | Diogo Belloni
; Mirek Giersz
; Helio J. Rocha-Pinto
; Nathan Leigh
; Abbas Askar
; | | Date: |
8 Sep 2016 | | Abstract: | This is the second in a series of papers associated with cataclysmic
variables (CVs) and related objects, formed in a suite of simulations for
globular cluster evolution performed with the MOCCA Monte Carlo code. We study
the properties of our simulated CV populations throughout the entire cluster
evolution. We find that dynamics extends the range of binary CV progenitor
properties, causing CV formation from binary progenitors that would otherwise
not become CVs. The CV formation rate in our simulations can be separated into
two regimes: an initial burst ($lesssim$ 1 Gyr) connected with the formation
of the most massive WDs, followed by a nearly constant formation rate. This
result holds for all models regardless of the adopted initial conditions, even
when most CVs form dynamically. Given the cluster age-dependence of CV
properties, we argue that direct comparisons to observed Galactic field CVs
could be misleading, since cluster CVs can be up to 4 times older than their
field counterparts. Our results also illustrate that, due mainly to unstable
mass transfer, some CVs that form in our simulations are destroyed before the
present-day. Finally, some field CVs might have originated from GCs, as found
in our simulations, although the fraction of such escapers should be small
relative to the entire Galactic field CV population. | | Source: | arXiv, 1609.2481 | | Services: | Forum | Review | PDF | Favorites | |
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