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

Query : 2003A&A...397..723D

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

Full paper

View the references in ADS

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 - 2023	#notes
1	V* BW Ant	LXB	09 29 20.19	-31 23 03.2		18.50	18.63			~	182	0
2	V* V822 Cen	LXB	14 58 21.9347842080	-31 40 07.515432768	11.95	12.85	12.8			K3-K7V	539	0
3	V* QX Nor	LXB	16 12 43.0	-52 25 23						~	895	1
4	V* V818 Sco	LXB	16 19 55.0692669024	-15 38 25.017666540	11.60	12.40	11.1			Oev	1618	0
5	4U 1642-45	LXB	16 45 47.7	-45 36 40			14.30			~	407	1
6	NAME Slow Burster	LXB	17 31 57.73	-33 50 02.5			15.50			~	810	1
7	KS 1731-260	LXB	17 34 13.46	-26 05 18.6				22.8	20.9	~	413	0
8	1RXS J173546.9-302859	LXB	17 35 46.88	-30 29 00.4						~	75	1
9	[KRL2007b] 291	LXB	17 51 13.49	-30 37 23.4						~	242	0
10	V* V4580 Sgr	LXB	18 08 27.54	-36 58 44.3		16.81	16.51			~	964	0
11	X Aql X-1	LXB	19 11 16.0571313336	+00 35 05.868232692						~	1105	1
12	V* V1341 Cyg	LXB	21 44 41.1544345272	+38 19 17.066570988	15.00	15.13	14.68	15.00		A9III	1136	1

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