2017A&A...606L..13S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST23:20:40

2017A&A...606L..13S - Astronomy and Astrophysics, volume 606, L13-13 (2017/10-1)

Inversion of the decay of the cyclotron line energy in Hercules X-1.

STAUBERT R., KLOCHKOV D., FURST F., WILMS J., ROTHSCHILD R.E. and HARRISON F.

Abstract (from CDS):

Recent observations of Her X-1 with NuSTAR and INTEGRAL in 2016 have provided evidence that the 20-year decay of the cyclotron line energy found between 1996 and 2015 has ended and that an inversion with a new increase, possibly similar to the one observed around 1990-1993, has started. We consider this a strong motivation for further observations and for enhanced efforts to significantly improve our theoretical understanding of the accretion process in binary X-ray pulsars. We speculate about the physics behind the long-term decay and its inversion, a possible cyclic behavior, and correlations with other variable observables.

Abstract Copyright: © ESO, 2017

Journal keyword(s): magnetic fields - binaries: eclipsing - stars: neutron - radiation mechanisms: non-thermal - line: formation - X-rays: general - X-rays: general

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* BQ Cam HXB 03 34 59.9116460415 +53 10 23.296351781   17.16 15.42 14.26 13.04 O8.5Ve 398 1
2 V* GP Vel HXB 09 02 06.8610736194 -40 33 16.896402010 6.85 7.37 6.87 6.31 6.05 B0.5Ia 1373 0
3 V* V850 Cen HXB 13 01 17.0966951298 -61 36 06.636402972   15.6       B2Vne 273 0
4 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1920 0
5 V* V490 Cep HXB 21 39 30.6903601561 +56 59 10.421972716   15.2       B1.5Ve 130 1

    Equat.    Gal    SGal    Ecl

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2020.07.03-23:20:40

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