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| 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
| 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 - 2024 |
#notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | V* BW Ant | LXB | 09 29 20.19 | -31 23 03.2 | 18.50 | 18.63 | ~ | 185 | 0 | |||
| 2 | V* V822 Cen | LXB | 14 58 21.9347842080 | -31 40 07.515432768 | 11.95 | 12.85 | 12.8 | K3-K7V | 544 | 0 | ||
| 3 | V* QX Nor | LXB | 16 12 43.0 | -52 25 23 | ~ | 905 | 1 | |||||
| 4 | V* V818 Sco | LXB | 16 19 55.0692669024 | -15 38 25.017666540 | 11.60 | 12.40 | 11.1 | Oev | 1643 | 0 | ||
| 5 | 4U 1642-45 | LXB | 16 45 47.7 | -45 36 40 | 14.30 | ~ | 416 | 1 | ||||
| 6 | NAME Slow Burster | LXB | 17 31 57.73 | -33 50 02.5 | 15.50 | ~ | 823 | 1 | ||||
| 7 | KS 1731-260 | LXB | 17 34 13.46 | -26 05 18.6 | 22.8 | 20.9 | ~ | 417 | 0 | |||
| 8 | 1RXS J173546.9-302859 | LXB | 17 35 46.88 | -30 29 00.4 | ~ | 78 | 1 | |||||
| 9 | [KRL2007b] 291 | LXB | 17 51 13.49 | -30 37 23.4 | ~ | 246 | 0 | |||||
| 10 | V* V4580 Sgr | LXB | 18 08 27.54 | -36 58 44.3 | 16.81 | 16.51 | ~ | 984 | 0 | |||
| 11 | X Aql X-1 | LXB | 19 11 16.0571313336 | +00 35 05.868232692 | ~ | 1136 | 1 | |||||
| 12 | V* V1341 Cyg | LXB | 21 44 41.1544345272 | +38 19 17.066570988 | 15.00 | 15.13 | 14.68 | 15.00 | A9III | 1155 | 1 |
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