THE VERY-LOW MASS X-RAY BINARY PULSARS - A NEW CLASS OF SOURCES

被引:255
作者
MEREGHETTI, S [1 ]
STELLA, L [1 ]
机构
[1] OSSERV ASTRON MILANO,I-20121 MILAN,ITALY
关键词
BINARIES; GENERAL; PULSARS; STARS; NEUTRON; ROTATION; X-RAYS;
D O I
10.1086/187805
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
While the distribution of spin periods of high-mass X-ray binaries spans more than four orders of magnitude (69 ms-25 minutes) the few known X-ray pulsars accreting from very low mass companions(<1 M.) have very similar periods between 5.4 and 8.7 s. These pulsars also display several other similarities, and we propose that they are members of a subclass of low-mass X-ray binaries (LMXBs) with similar magnetic field (a few times 10(11) G), companion stars and, possibly, evolutionary histories. If they are rotating at, or close to, the equilibrium period, their properties are consistent with luminosities of the order of a few times 10(35) ergs s(-1). These pulsars might represent the closest members of a subclass of LMXBs characterized by lower luminosities, higher magnetic fields, and smaller ages than nonpulsating LMXBs.
引用
收藏
页码:L17 / L20
页数:4
相关论文
共 44 条
[1]  
BILDSTEN L, 1994, AIP C P, V304, P290
[2]   THE CONTINUING SEARCH FOR THE OPTICAL COUNTERPART OF THE ENIGMATIC X-RAY PULSAR 1E2259+586 [J].
COE, MJ ;
JONES, LR .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1992, 259 (01) :191-202
[3]  
COE MJ, 1994, IN PRESS MNRAS
[4]  
CORBET RHD, 1990, MON NOT R ASTRON SOC, V243, P553
[5]  
CORBET RHD, 1995, IN PRESS APJ
[6]   OPTICAL AND IR IMAGING OF THE LOCALITY OF 1E2259+586 [J].
DAVIES, SR ;
COE, MJ .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1991, 249 (02) :313-318
[7]   AN X-RAY PULSAR IN SNR G109.1-1.0 [J].
FAHLMAN, GG ;
GREGORY, PC .
NATURE, 1981, 293 (5829) :202-204
[8]   A POSSIBLE OPTICAL COUNTERPART TO THE X-RAY PULSAR 1E 2259+586 [J].
FAHLMAN, GG ;
HICKSON, P ;
RICHER, HB ;
GREGORY, PC ;
MIDDLEDITCH, J .
ASTROPHYSICAL JOURNAL, 1982, 261 (01) :L1-L5
[9]   ACCRETION BY ROTATING MAGNETIC NEUTRON STARS .2. RADIAL AND VERTICAL STRUCTURE OF THE TRANSITION ZONE IN DISK ACCRETION [J].
GHOSH, P ;
LAMB, FK .
ASTROPHYSICAL JOURNAL, 1979, 232 (01) :259-276
[10]   AN EXTRAORDINARY NEW CELESTIAL X-RAY SOURCE [J].
GREGORY, PC ;
FAHLMAN, GG .
NATURE, 1980, 287 (5785) :805-806