Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...2e..35m&link_type=abstract
On the Present and Future of Pulsar Astronomy, 26th meeting of the IAU, Joint Discussion 2, 16-17 August, 2006, Prague, Czech Re
Astronomy and Astrophysics
Astronomy
Scientific paper
In the paper we have studied the relationship between parameters of the radiation from pulsars and the dependence of the rates of the radiation periods of these objects on their characteristic ages. We have obtained the following results. (a.) The rate of change in the radiation periods (derivatives of periods, dP/ dt) of pulsars depends on their characteristic age. These changes proceed more slowly with age. The rate of change of the radiation period of pulsars can in some way serve as an indicator of their age. (b.) The relationship between the rate dP/dt of change of the period and the period P has been demonstrated. For young pulsars this relationship is weak. In the course of evolution with age, the relationship between the derivative of the period and the period becomes closer. Whereas for "young" (T<10^6 years) pulsars the correlation coefficient for the logdP/dt - logP plot is only 0.49 (p<0.0001), for "old" (T≥10^8 years, T> 0^9 years) pulsars the correlation coefficient approaches unity (p<0.0001). Since, as shown above, the rate of change of the radiation period decreases with age in pulsars, we can say that the lower the rate of change of the radiation period of a pulsar is, the closer is the relationship between the derivative of its period and its period. In conclusion, it should be noted that we have also examined separately the data in the catalog of Taylor et al., which contains 706 objects. After eliminating the members of binary and multiple systems, as well as the members of the Magellanic Clouds, slightly more than 500 objects remain. The research is supported by INTAS under YS Fellowship Grant Nr. 05-109-4842.
Harutyunyan A. N.
Malumian V. H.
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