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Search for orbital motion of the pulsar 4U 1626-67: Candidate for a neutron star with a supernova fall-back accretion disk

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Title Search for orbital motion of the pulsar 4U 1626-67: Candidate for a neutron star with a supernova fall-back accretion disk
 
Creator JAIN, C
PAUL, B
JOSHI, K
DUTTA, A
RAICHUR, H
 
Subject x-ray pulsar
4u-1626-67
oscillations
discovery
emission
binary
debris
accretion
accretion disks
binaries : general
stars : individual (4u 1626-67)
stars : neutron
x-rays : stars
 
Description We report here results from a new search for orbital motion of the accretion powered X-ray pulsar 4U 1626-67 using two different analysis techniques. X-ray light curve obtained with the Proportional Counter Array of the Rossi X-ray Timing Explorer during a long observation carried out in February 1996, was used in this work. The spin period and the local period derivative were first determined from the broad 2-60 keV energy band light curve and these were used for all subsequent timing analysis. In the first technique, the orbital phase dependent pulse arrival times were determined for different trial orbital periods in the range of 500 to 10,000 s. We have determined a 3 sigma upper limit of 13 It-ms on the projected semi-major axis of the orbit of the neutron star for most of the orbital period range, while in some narrow orbital period ranges, covering about 10% of the total orbital period range, it is 20 It-ms. In the second method, we have measured the pulse arrival times at intervals of 100 s over the entire duration of the observation. The pulse arrival time data were used to put an upper limit on any periodic arrival time delay using the Lomb-Scargle periodogram. We have obtained a similar upper limit of 10 It-ms using the second method over the orbital period range of 500-10,000 s. This puts very stringent upper limits for the mass of the compact object except for the unlikely case of a complete face-on orientation of the binary system with respect to our line-of-sight. In the light of this measurement and the earlier reports, we discuss the possibility of this system being a neutron star with a supernovae fall-back accretion disk.
 
Publisher SPRINGER
 
Date 2011-08-29T18:21:53Z
2011-12-26T12:58:42Z
2011-12-27T05:49:06Z
2011-08-29T18:21:53Z
2011-12-26T12:58:42Z
2011-12-27T05:49:06Z
2007
 
Type Article
 
Identifier JOURNAL OF ASTROPHYSICS AND ASTRONOMY, 28(4), 175-184
0250-6335
http://dx.doi.org/10.1007/s12036-007-0015-5
http://dspace.library.iitb.ac.in/xmlui/handle/10054/12156
http://hdl.handle.net/10054/12156
 
Language en