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Mon. Not. R. Astron. Soc. 000, 111 (0000) Printed 17 August 2011 (MN LATEX style file v2.2) Star formation history, double degenerates and type Ia supernovae
 

Summary: Mon. Not. R. Astron. Soc. 000, 111 (0000) Printed 17 August 2011 (MN LATEX style file v2.2)
Star formation history, double degenerates and type Ia supernovae
in the thin disc
Shenghua Yu and C. Simon Jeffery
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
Accepted . Received ;
ABSTRACT
We investigate the relation between the star formation history and the evolution of the
double-degenerate (DD) population in the thin disc of the Galaxy, which we assume to have
formed 10 Gyr before the present. We introduce the use of star-formation contribution func-
tions as a device for evaluating the birth rates, total number and merger rates of DDs. These
contribution functions help to demonstrate the relation between star-formation history and the
current DD population and, in particular, show how the numbers of different types of DD are
sensitive to different epochs of star formation.
Analysis of the contribution functions given by a quasi-exponentially decline in the star-
formation rate shows that star formation from 0 to 8 Gyr after thin-disc formation dominates
the present rates and total numbers of He+He DDs and CO+He DDs. Similarly, the current
numbers of CO+CO and ONeMg+X DDs come mainly from early star formation (< 6 Gyr)
, although star formation from 4 to 8 Gyr continued to contribute more CO+CO than He+He
DDs. The present birth-rates for CO+CO and ONeMg+X DDs are strongly governed by recent

  

Source: Armagh Observatory

 

Collections: Physics