Optical identification of the companion to PSR J1911-5958A, the pulsar binary in the outskirts of NGC 6752

被引：27

作者：

Bassa, CG

Verbunt, F

van Kerkwijk, MH

Homer, L

机构：

[1] Univ Utrecht, Astron Inst, NL-3508 TA Utrecht, Netherlands

[2] Univ Toronto, Dept Astron & Astrophys, Toronto, ON M5S 3H8, Canada

[3] Univ Washington, Dept Astron, Seattle, WA 98195 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2003年 / 409卷 / 03期

关键词：

pulsars : individual : PSR J1911-5958A; globular clusters : individual : NGC6752; stars : neutron; stars : white dwarfs; WHITE-DWARF STARS; MILLISECOND PULSARS; CLUSTER CORE; NEUTRON-STAR; WFPC2; CALIBRATION; EVOLUTION; MASS; PERFORMANCE; J1012+5307;

D O I：

10.1051/0004-6361:20031339

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on the identification of the optical counterpart of the binary millisecond pulsar PSR J1911-5958A, located in the outskirts of the globular cluster NGC6752. At the position of the pulsar we find an object with V = 22.08, B - V = 0.38, U - B = - 0.49. The object is blue with respect to the cluster main sequence by 0.8 mag in B - V. We argue that the object is the white dwarf companion of the pulsar. Comparison with white dwarf cooling models shows that this magnitude and colors are consistent with a low-mass white dwarf at the distance of NGC6752. If associated with NGC6752, the white dwarf is relatively young, less than or similar to 2 Gyr, which sets constraints on the formation of the binary and its ejection from the core of the globular cluster.

引用

页码：L31 / L34

页数：4