New Measurements of Orbital Period Change in Cygnus X-3

Details New Measurements of Orbital Period Change in Cygnus X-3 New Measurements of Orbital Period Change in Cygnus X-3

2002-06-10

arxiv.org/abs/astro-ph/0206134v1

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20020923

A nonlinear nature of the binary ephemeris of Cygnus X-3 indicates either a change in the orbital period or an apsidal motion of the orbit. We have made extended observations of Cygnus X-3 with the Pointed Proportional Counters (PPCs) of the Indian X-ray Astronomy Experiment (IXAE) during 1999 July 3-13 and October 11-14. Using the data from these observations and the archival data from ROSAT, ASCA, BeppoSAX and RXTE, we have extended the data base for this source. Adding these new arrival time measurements to the published results, we make a comparison between the various possibilities, (a) orbital decay due to mass loss from the system, (b) mass transfer between the stars, and (c) apsidal motion of the orbit due to gravitational interaction between the two components. Orbital decay due to mass loss from the companion star seems to be the most probable scenario.

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