THE BINARY ZOO - THE CALCULATION OF PRODUCTION-RATES OF BINARIES THROUGH 2+1-ENCOUNTERS IN GLOBULAR-CLUSTERS

被引:51
作者
DAVIES, MB [1 ]
机构
[1] CALTECH,PASADENA,CA 91125
关键词
BINARIES; GENERAL; STARS; EVOLUTION; GLOBULAR CLUSTERS;
D O I
10.1093/mnras/276.3.887
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In studying encounters between binaries and single stars, one is interested in three classes of events: exchanges of stars, hardening of the original binary by a third star, and the production of merged objects. We present a means for computing cross-sections for these three outcomes for an arbitrary binary and single star, as might be found in the core of a globular cluster. The cross-sections for a number of binaries in various stellar populations are then computed. We consider multiple encounters and the ultimate fate of a population of binaries fed into the cores of different globular cluster models. We see that the presence of only a relatively small number of binaries (containing 10 per cent of the stars) will boost the production rate of astrophysically interesting objects by a factor of at least a few over the rates expected from encounters between single stars. In particular, the ratio of smothered neutron stars to low-mass X-ray binaries (LMXBs) may be greatly increased, possibly explaining, in part, the excess of millisecond pulsars compared to LMXBs.
引用
收藏
页码:887 / 905
页数:19
相关论文
共 29 条
[1]   3-DIMENSIONAL HYDRODYNAMICAL SIMULATIONS OF COLLIDING STARS .3. COLLISIONS AND TIDAL CAPTURES OF UNEQUAL-MASS MAIN-SEQUENCE STARS [J].
BENZ, W ;
HILLS, JG .
ASTROPHYSICAL JOURNAL, 1992, 389 (02) :546-557
[2]  
Binney J., 1987, GALACTIC DYNAMICS, P235
[4]   TOWARD A REALISTIC 3-BODY PROBLEM [J].
CLEARY, PW ;
MONAGHAN, JJ .
ASTROPHYSICAL JOURNAL, 1990, 349 (01) :150-162
[5]   CLOSE ENCOUNTERS OF THE 3RD-BODY KIND [J].
DAVIES, MB ;
BENZ, W ;
HILLS, JG .
ASTROPHYSICAL JOURNAL, 1994, 424 (02) :870-886
[6]   STELLAR ENCOUNTERS INVOLVING NEUTRON-STARS IN GLOBULAR-CLUSTER CORES [J].
DAVIES, MB ;
BENZ, W ;
HILLS, JG .
ASTROPHYSICAL JOURNAL, 1992, 401 (01) :246-259
[7]   ENCOUNTERS BETWEEN BINARIES AND NEUTRON-STARS [J].
DAVIES, MB ;
BENZ, W ;
HILLS, JG .
ASTROPHYSICAL JOURNAL, 1993, 411 (01) :285-297
[8]   A STELLAR AUDIT - THE COMPUTATION OF ENCOUNTER RATES FOR 47-TUCANAE AND OMEGA-CENTAURI [J].
DAVIES, MB ;
BENZ, W .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1995, 276 (03) :876-886
[9]   PRODUCTION OF RECYCLED PULSARS IN GLOBULAR-CLUSTERS VIA 2-BODY TIDAL CAPTURE [J].
DISTEFANO, R .
ASTROPHYSICAL JOURNAL, 1992, 396 (02) :587-605
[10]   EVOLVING, DYNAMIC-MODELS FOR COLLAPSED-CORE GLOBULAR-CLUSTERS - M15 AND NGC-6624 [J].
GRABHORN, RP ;
COHN, HN ;
LUGGER, PM ;
MURPHY, BW .
ASTROPHYSICAL JOURNAL, 1992, 392 (01) :86-98