Correlated X–ray timing and spectral behavior in GX 349+2 *
1
ISRO Satellite Centre, Airport Road, Bangalore 560 017, India
2
Joint Astronomy Program, Indian Institute of Science, Bangalore 560012, India
3
Indian Institute of Astrophysics, Bangalore 560 034, India e-mail: vivek_isac@yahoo.com; sudip@physics.iisc.ernet.in
Corresponding author: V. K. Agrawal, vivek_isac@yahoo.com
Received:
27
December
2001
Accepted:
4
November
2002
We present a detailed and systematic investigation of correlated spectral and timing properties of the Z source GX 349+2, using extensive data 
221 ks) obtained from the Proportional-Counter-Array on-board RXTE satellite, during January 1998 and September–October 1998. For the first time a detailed comparison between the normal-branch-properties and the flaring-branch-properties of GX 349+2 has been possible, since this study showed the presence of a rare, extended normal branch. Peaked noise properties have been analyzed as functions of position along the Z-track and have been compared to those of Cyg X-2.
Key words: accretion, accretion disks / stars: binaries: close / stars: individual: GX 349+2 / stars: neutron / X–rays: stars
© ESO, 2003