2006A&A...458..885F


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST18:12:27

2006A&A...458..885F - Astronomy and Astrophysics, volume 458, 885-893 (2006/11-2)

A torque reversal of 4U1907+09.

FRITZ S., KREYKENBOHM I., WILMS J., STAUBERT R., BAYAZIT F., POTTSCHMIDT K., RODRIGUEZ J. and SANTANGELO A.

Abstract (from CDS):

We present an analysis of the accreting X-ray pulsar system 4U1907+09 based on INTEGRAL data. The main focus of this analysis is a study of the timing behavior of this source. In addition we also show an analysis of the 5-90keV spectrum. The data were extracted using the official INTEGRAL software OSA 5.1. Timing analysis was performed using epoch folding and pulsar pulse phasing. We have measured 12 individual pulse periods for the years 2003 to 2005. We confirm earlier RXTE results that during 2003 the spin down became slower and show furthermore that after this phase 4U1907+09 started to spin up with {dot}(P)pulse=-0.158s/yr in 2004. The similarity of the pulse period histories of 4U1907+09 and 4U1626-26 suggests that accretion onto an oblique rotator, as recently proposed by Perna et al., is a possible explanation for this change.

Abstract Copyright:

Journal keyword(s): stars: individual: 4U1907+09 - X-rays: binaries - stars: neutron - accretion, accretion disks - X-rays: stars

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* GP Vel HXB 09 02 06.8610736194 -40 33 16.896402010 6.85 7.37 6.87 6.31 6.05 B0.5Ia 1377 0
2 V* KZ TrA LXB 16 32 16.79 -67 27 39.3 17.40 18.60 18.5     ~ 526 1
3 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1929 0
4 V* V2116 Oph Sy* 17 32 02.1544831482 -24 44 44.125962969   20.78 18.4     M6IIIe 647 1
5 4U 1901+03 HXB 19 03 39.3919805263 +03 12 15.742327187           OB 76 0
6 4U 1907+09 HXB 19 09 37.9 +09 49 49   19.41 16.35 14.40 12.53 O8.5Iab 309 1
7 4U 1908+075 HXB 19 10 48.2141670291 +07 35 51.715745251           O7.5-9.5sg 103 0
8 INTEGRAL1 111 HXB 19 14 04.2269997048 +09 52 58.398334234   18.6 16.4     B0.5I 88 0
9 Granat 1915+105 LXB 19 15 11.54938 +10 56 44.7585           ~ 2310 0

    Equat.    Gal    SGal    Ecl

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2020.10.24-18:12:27

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