2006A&A...460L...1M


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.11CEST14:38:38

2006A&A...460L...1M - Astronomy and Astrophysics, volume 460, L1-4 (2006/12-3)

A new symbiotic low mass X-ray binary system: 4U 1954+319.

MATTANA F., GOETZ D., FALANGA M., SENZIANI F., DE LUCA A., ESPOSITO P. and CARAVEO P.A.

Abstract (from CDS):

4U 1954+319 was discovered 25 years ago, but only recently has a clear picture of its nature begun to emerge. We present for the first time a broad-band spectrum of the source and a detailed timing study using more than one year of monitoring data. The timing and spectral analysis was done using publicly available Swift, INTEGRAL, BeppoSAX, and RXTE/ASM data in the 0.7 to 150keV energy band. The source spectrum is described well by a highly absorbed (NH∼1023cm–2) power law with a high-energy exponential cutoff around 15keV. An additional black body component is needed below 3keV to account for a soft excess. The derived ∼5h periodicity, with a spin-up timescale of ∼25 years, could be identified as the neutron star spin period. The spectral and timing characteristics indicate that we are dealing both with the slowest established wind-accreting X-ray pulsar and with the second confirmed member of the emerging class dubbed ``symbiotic low mass X-ray binaries'' to host a neutron star.

Abstract Copyright:

Journal keyword(s): binaries: close - pulsars: individual: 4U 1954+319 - stars: neutron - X-rays: binaries

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 AJG 44 Psr 16 17 33.000 -51 02 00.00           ~ 465 3
2 2E 3623 X 16 17 36.30 -51 02 26.6           ~ 92 1
3 V* V934 Her LP* 17 06 34.5143100938 +23 58 18.652285813 11.20 9.16 7.62     M2III 121 0
4 V* V2116 Oph Sy* 17 32 02.1544831482 -24 44 44.125962969   20.78 18.4     M6IIIe 653 1
5 4U 1954+31 HXB 19 55 42.3379574888 +32 05 49.039923678   12.02 9.97     M4/5III 104 0
6 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3996 0
7 NAME Cyg Complex reg 20 32 +45.0           ~ 535 0

    Equat.    Gal    SGal    Ecl

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2021.04.11-14:38:38

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