RXTE observations of the Be star X-ray transient X0726-260 (4U 0728-25): Orbital and pulse periods

被引：17

作者：

Corbet, RHD ^{[1
]}

Peele, AG ^{[1
]}

机构：

[1] NASA,GODDARD SPACE FLIGHT CTR,NATL RES COUNCIL,GREENBELT,MD 20771

来源：

ASTROPHYSICAL JOURNAL | 1997年 / 489卷 / 01期

关键词：

stars; individual; (X0726-260); neutron; X-rays;

D O I：

10.1086/310972

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Rossi X-Ray Timing Explorer (RXTE) All-Sky Monitor observations of the transient Be star X-ray source X0726-260 suggest a 34.5 day period. This is apparently confirmed by a serendipitous RXTE Proportional Counter Array (PCA) slew detection of the source on 1997 May 5, near the time of a predicted flux maximum. A subsequent 5 ks pointed observation of X0726-260 with the RXTE PCA detector was carried out on 1997 June 7, when X0726-260 was predicted to be bright again, and this revealed pulsations at a period of 103.2 s. If the 34.5 day period is orbital, then the pulse period is surprisingly long compared with that predicted by the correlation between orbital period and spin period observed for other Be/neutron star systems. A possible similarity with GRO J2058+42 is briefly discussed.

引用

页码：L83 / L86

页数：4

共 24 条

[1] Observations of accreting pulsars [J].

Bildsten, L ;

Chakrabarty, D ;

Chiu, J ;

Finger, MH ;

Koh, DT ;

Nelson, RW ;

Prince, TA ;

Rubin, BC ;

Scott, DM ;

Stollberg, M ;

Vaughan, BA ;

Wilson, CA ;

Wilson, RB .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1997, 113 (02) :367-408

[2]

BRADT HV, 1993, ASTRON ASTROPHYS SUP, V97, P355

[3]

CASTROTIRADO AJ, 1996, 6516 IAU

[4]

CORBET R, 1997, 6647 IAU

[5]

CORBET RHD, 1984, ASTRON ASTROPHYS, V141, P91

[6] THE 3 TYPES OF HIGH-MASS X-RAY PULSATOR [J].

CORBET, RHD .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1986, 220 (04) :1047-1056

[7]

CORBET RHD, 1984, ASTRON ASTROPHYS, V131, P385

[8]

CORBET RHD, 1997, 6556 IAU

[9] 4TH UHURU CATALOG OF X-RAY SOURCES [J].

FORMAN, W ;

JONES, C ;

COMINSKY, L ;

JULIEN, P ;

MURRAY, S ;

PETERS, G ;

TANANBAUM, H ;

GIACCONI, R .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1978, 38 (04) :357-412

[10] In orbit performance and calibration of the Rossi X-ray Timing Explorer (RXTE) Proportional Counter Array (PCA) [J].

Jahoda, K ;

Swank, JH ;

Giles, AB ;

Stark, MJ ;

Strohmayer, T ;

Zhang, W ;

Morgan, EK .

EUV, X-RAY, AND GAMMA-RAY INSTRUMENTATION FOR ASTRONOMY VII, 1996, 2808 :59-70

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