2006A&A...453.1037B


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.18CEST01:44:44

2006A&A...453.1037B - Astronomy and Astrophysics, volume 453, 1037-1040 (2006/7-3)

Recent timing studies on RXTE observations of 4U 1538-52.

BAYKAL A., INAM S.C. and BEKLEN E.

Abstract (from CDS):

The high mass X-ray binary pulsar 4U 1538-52 was observed between July 31 and August 7, 2003. Using these observations, we determined new orbital epochs for both circular and elliptical orbit models. The orbital epochs for both orbit solutions agreed with each other and yielded an orbital period derivative {dot}(P)/P=(0.4±1.8)x10–6yr–1. This value is consistent with the earlier measurement of {dot}(P)/P=(2.9±2.1)x10–6yr–1 at the 1σ level and gives only an upper limit to the orbital period decay. Our determination of the pulse frequency showed that the source spun up at an average rate of 2.76x10–14Hz/s between 1991 and 2003.

Abstract Copyright:

Journal keyword(s): X-rays: binaries - stars: neutron - pulsars: individual: 4U 1538-52 - accretion, accretion disks

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 SK 160 HXB 01 17 05.1447530244 -73 26 36.015353425 12.23 13.00 13.15   13.17 O9.7Ia+ 813 0
2 X LMC X-4 HXB 05 32 49.5558669817 -66 22 13.202534152   13.9 14.0     O8III 618 0
3 V* V779 Cen HXB 11 21 15.0920367078 -60 37 25.627505233   14.4 12.27     O9III/Veq 1006 0
4 V* QV Nor HXB 15 42 23.3633078550 -52 23 09.576918639   16.3 14.5     B0.2Ia:e 380 1
5 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1953 0
6 HD 153919 HXB 17 03 56.7728262865 -37 50 38.912077679 6.06 6.78 6.51 6.08 5.90 O6Iafcp 769 1
7 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1804 2

    Equat.    Gal    SGal    Ecl

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2021.04.18-01:44:44

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