X-RAY AND OPTICAL OBSERVATIONS OF SCOX-1

被引:45
作者
WHITE, NE
MASON, KO
SANFORD, PW
ILOVAISKY, SA
CHEVALIER, C
机构
[1] MULLARD SPACE SCI LAB,DEPT PHYS,DORKING,SURREY,ENGLAND
[2] OBSERV PARIS,DAF,F-92190 MEUDON,FRANCE
关键词
Active state - Flux variability - Highest temperature - Intensity levels - Low emission - Optical observations - Quiescent period - Quiescent state - Source intensity - X-ray observations;
D O I
10.1093/mnras/176.1.91
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report on a number of Copernicus observations of ScoX-i, in both its quiescent and active states, made between 1973 and 1975. The active states consisted of flaring intervals lasting several hours, made up of series of bursts with duration 4-15 min, and involving intensity increases up to almost twice the non-flaring level. Temperatures during this state ranged from 5-5 to > 20 keV and were well correlated with the intensity level. During quiescent states the source exhibited 20 per cent flux variability over several hours, with a lower emission measure and higher temperature than at the corresponding flux level in the active state. During active states the minimum source intensity (between flares) has the same value in all observations some of which were separately by up to 2 years. In quiescent periods the intensity was never below this minimum. These data are discussed and compared with the results of previous observers. Some optical photometric and spectroscopic results obtained simultaneously with a Copernicus observation are also presented. © Royal Astronomical Society.
引用
收藏
页码:91 / 102
页数:12
相关论文
共 25 条
[1]   DESIGN OF AN X-RAY TELESCOPE SYSTEM FOR AN ORBITING ASTRONOMICAL OBSERVATORY [J].
BOWLES, JA ;
PATRICK, TJ ;
SHEATHER, PH ;
EIBAND, AM .
JOURNAL OF PHYSICS E-SCIENTIFIC INSTRUMENTS, 1974, 7 (03) :183-191
[2]   X-RAY, OPTICAL, AND RADIO BEHAVIOR OF SCORPIUS X-1 - 1971 COORDINATED OBSERVATIONS [J].
BRADT, HV ;
BRAES, LLE ;
FORMAN, W ;
HESSER, JE ;
HILTNER, WA ;
HJELLMING, R ;
KELLOGG, E ;
KUNKEL, WE ;
MILEY, GK ;
MOORE, G ;
PEL, JW ;
THOMAS, J ;
VANDENBOUT, P ;
WADE, C ;
WARNER, B .
ASTROPHYSICAL JOURNAL, 1975, 197 (02) :443-455
[3]   EXTENDED X-RAY AND RADIO OBSERVATIONS OF SCORPIUS X-1 [J].
CANIZARES, CR ;
CLARK, GW ;
LEWIN, WHG ;
SCHNOPPER, HW ;
SPROTT, GF ;
HJELLMING, RM ;
WADE, CM .
ASTROPHYSICAL JOURNAL, 1973, 179 (01) :L1-+
[4]   X-RAY, OPTICAL, AND RADIO BEHAVIOR OF SCORPIUS X-1 - 1972 COORDINATED OBSERVATIONS [J].
CANIZARES, CR ;
CLARK, GW ;
LI, FK ;
MURTHY, GT ;
BARDAS, D ;
SPROTT, GF ;
SPENCER, JH ;
MOOK, DE ;
HILTNER, WA ;
WILLIAMS, WL ;
MOFFETT, TJ ;
GRUPSMITH, G ;
VANDENBOUT, PA ;
GOLSON, JC ;
IRVING, C ;
FROHLICH, A ;
VANGENDEREN, AM .
ASTROPHYSICAL JOURNAL, 1975, 197 (02) :457-466
[5]   HELIUM LINES IN SPECTRUM OF SCORPIUS X-1 [J].
CHESLEY, SE .
ASTROPHYSICAL JOURNAL, 1975, 196 (01) :103-106
[6]   SIMULTANEOUS OBSERVATIONS OF OPTICAL AND X-RAY SPECTRA OF SCO XR-1 [J].
CHODIL, G ;
MARK, H ;
RODRIGUES, R ;
SEWARD, FD ;
SWIFT, CD ;
TURIEL, I ;
HILTNER, WA ;
WALLERSTEIN, G ;
MANNERY, EJ .
ASTROPHYSICAL JOURNAL, 1968, 154 (2P1) :645-+
[7]   SPECTROSCOPIC BINARY SCORPIUS X-1 [J].
COWLEY, AP ;
CRAMPTON, D .
ASTROPHYSICAL JOURNAL, 1975, 201 (02) :L65-L68
[8]   TEMPORAL BEHAVIOR OF TAURUS X-1 (CRAB-NEBULA) [J].
DAVISON, PJN .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1975, 173 (01) :77-83
[9]  
EDWARDSCHESLEY S, 1975, ASTROPHYS J, V196, P103
[10]   X-RAY AND OPTICAL VARIATIONS OF SCORPIUS-X-1 [J].
EVANS, WD ;
BELLAN, RD ;
CONNER, JP ;
STRONG, IB ;
HILTNER, WA ;
KUNKEL, WE .
ASTROPHYSICAL JOURNAL, 1970, 162 (02) :L115-&