2003A&A...397..723D


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET10:07:35

2003A&A...397..723D - Astronomy and Astrophysics, volume 397, 723-727 (2003/1-2)

Constraints on the neutron star magnetic field of the two X-ray transients SAX J1808.4-3658 and Aql X-1.

DI SALVO T. and BURDERI L.

Abstract (from CDS):

The recently discovered coherent X-ray pulsations at a frequency of ∼400Hz in SAX J1808.4-3658, together with a measure of the source luminosity in quiescence, allow us to put an upper limit on the neutron star magnetic field, that is B≤5x108 Gauss, using simple considerations on the position of the magnetospheric radius during quiescent periods. Combined with the lower limit inferred from the presence of X-ray pulsations, this constrains the SAX J1808.4-3658 neutron star magnetic field in the quite narrow range (1-5)x108 Gauss. Similar considerations applied to the case of Aql X-1 give a neutron star magnetic field lower than ∼109 Gauss.

Abstract Copyright:

Journal keyword(s): accretion disks - stars: individual: SAX J1808.4-3658, Aql X-1 - stars: neutron - X-rays: stars - X-rays: binaries - X-rays: general

Simbad objects: 12

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Number of rows : 12

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 V* BW Ant LXB 09 29 20.19 -31 23 03.2   18.50 18.63     ~ 177 0
2 V* V822 Cen LXB 14 58 21.9350279092 -31 40 07.515505032 11.95 12.85 12.8     K3-K7V 514 0
3 V* QX Nor LXB 16 12 43.0 -52 25 23           ~ 846 1
4 V* V818 Sco LXB 16 19 55.0688745859 -15 38 25.019920749 11.60 12.40 11.1     Oev 1542 0
5 4U 1642-45 LXB 16 45 47.7 -45 36 40     14.30     ~ 388 1
6 NAME Slow Burster LXB 17 31 57.73 -33 50 02.5     15.50     ~ 774 1
7 KS 1731-260 LXB 17 34 13.46 -26 05 18.6       22.8 20.9 ~ 397 0
8 1RXS J173546.9-302859 LXB 17 35 46.88 -30 29 00.4           ~ 68 1
9 [KRL2007b] 291 LXB 17 51 13.49 -30 37 23.4           ~ 234 0
10 V* V4580 Sgr LXB 18 08 27.54 -36 58 44.3   16.81 16.51     ~ 890 0
11 X Aql X-1 LXB 19 11 16.0572031521 +00 35 05.876658556           ~ 1034 1
12 V* V1341 Cyg LXB 21 44 41.1544523872 +38 19 17.065856122 15.00 15.13 14.68 15.00   A9III 1091 1

    Equat.    Gal    SGal    Ecl

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2021.03.03-10:07:35

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