DISCOVERY OF AN X-RAY BURST FROM X2127+11 IN THE GLOBULAR-CLUSTER M15

被引:35
作者
DOTANI, T
INOUE, H
MURAKAMI, T
NAGASE, F
TANAKA, Y
TSURU, T
MAKISHIMA, K
OHASHI, T
CORBET, RHD
机构
[1] UNIV TOKYO,DEPT PHYS,BUNKYO KU,TOKYO 113,JAPAN
[2] PENN STATE UNIV,DEPT ASTRON,DAVEY LAB 525,UNIVERSITY PK,PA 16802
关键词
D O I
10.1038/347534a0
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
THE nature and evolution of binary X-ray sources in globular clusters are poorly understood. Among the ∼10 bright X-ray sources in globular clusters, X2127+11 in M15 is very important because it is the only one for which the optical counterpart, AC211, and orbital period, 8.5 h, are both known1. We have detected a type I X-ray burst from X2127+11, which was the only bright X-ray source in a globular cluster from which no burst had been detected. The burst was of long duration (≳150s) and had a precursor separated from the main peak by ∼6 s. This means that the burst was very energetic and that a large photospheric expansion occurred. The observed burst peak luminosity, well above 1038 erg s-1, is hard to reconcile with the standard idea that X2127+11 is screened from direct view by an accretion disk. This latter view arises from consideration of the low ratio of X-ray to optical luminosity, which suggests that only a small fraction of X-rays is visible through scattering by an accretion-disk corona around the source2-4. © 1990 Nature Publishing Group.
引用
收藏
页码:534 / 536
页数:3
相关论文
共 25 条
[1]  
AURIERE M, 1986, ASTRON ASTROPHYS, V158, P158
[2]   OUTFLOW FROM THE OUTER LAGRANGIAN POINT - OBSERVATIONS AND MODELS OF 4U 2127+12 IN M15 [J].
BAILYN, CD ;
GARCIA, MR ;
GRINDLAY, JE .
ASTROPHYSICAL JOURNAL, 1989, 344 (02) :786-790
[3]   EXOSAT OBSERVATIONS OF THE X-RAY SOURCE IN M15 [J].
CALLANAN, PJ ;
FABIAN, AC ;
TENNANT, AF ;
REDFERN, RM ;
SHAFER, RA .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1987, 224 (03) :781-789
[4]  
CALLANAN PJ, IN PRESS ACCRETION P
[5]  
CARHLES PA, 1988, ADV SPACE RES, V8, P515
[6]   AN EMISSION-LINE OBJECT IN THE CORE OF M15 [J].
CHARLES, PA ;
JONES, DC ;
NAYLOR, T .
NATURE, 1986, 323 (6087) :417-419
[7]   ACCRETION DISK CORONAE AND THE X-RAY SOURCE IN M15 [J].
FABIAN, AC ;
GUILBERT, PW ;
CALLANAN, PJ .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1987, 225 (02) :P29-P31
[8]   DEEP CCD PHOTOMETRY IN GLOBULAR-CLUSTERS .3. M15 [J].
FAHLMAN, GG ;
RICHER, HB ;
VANDENBERG, DA .
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1985, 58 (02) :225-&
[9]   DUAL CHARACTER OF RAPID BURSTER AND A CLASSIFICATION OF X-RAY BURSTS [J].
HOFFMAN, JA ;
MARSHALL, HL ;
LEWIN, WHG .
NATURE, 1978, 271 (5646) :630-633
[10]   SAS-3 OBSERVATIONS OF 2 X-RAY TRANSIENT EVENTS WITH PRECURSORS [J].
HOFFMAN, JA ;
LEWIN, WHG ;
DOTY, J ;
JERNIGAN, JG ;
HANEY, M ;
RICHARDSON, JA .
ASTROPHYSICAL JOURNAL, 1978, 221 (02) :L57-L62