Timing Observations of the 8-Hr Binary Pulsar 2127+11C in the Globular Cluster M15
Abstract
We present new results are presented on the position and characteristics of the 8 hr binary pulsar 2127 + 11C in the post-core-collapse (PCC) globular cluster M15. Our results indicate that PSR 2127 + 11C has been ejected from the cluster core via a close encounter with another binary system or isolated star. In particular, the position derived from a phase-connected timing solution places the PSR 2127 + 11C system 2.7 pc (projected) from the core, well outside the compact region containing the other four detected pulsars and the X-ray binary system X2127 + 11/AC 211. While PSR 2127 + 11C is likely still bound to the cluster, it is nonetheless probable that other compact binary pulsars have been totally ejected, thereby contributing to the population of field binary pulsars. Timing results from PSR 2127 + 11C also show a relativistic advance of periastron of 4.46 deg yr^(-1), indicating that the total mass of the system is 2.71 M_⊙.
Additional Information
Copyright 1991, American Astronomical Society. Received 1991 January 24; accepted 1991 March 29. We are grateful to J. H. Taylor for supplying the TEMPO software package; E. S. Phinney for stimulating discussions; S. Djorgovski for an optical image of M15; and Jose Navarro for help in observations. This work was supported by the National Science Foundation, the US Department of Energy, and the Alfred P. Sloan Foundation.Attached Files
Published - 1991-05.pdf
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Additional details
- Eprint ID
- 45643
- Resolver ID
- CaltechAUTHORS:20140509-112210129
- NSF
- Department of Energy (DOE)
- Alfred P. Sloan Foundation
- Created
-
2014-05-12Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Space Radiation Laboratory, Division of Geological and Planetary Sciences
- Other Numbering System Name
- Space Radiation Laboratory
- Other Numbering System Identifier
- 1991-05