2018A&A...610A..88V


Query : 2018A&A...610A..88V

2018A&A...610A..88V - Astronomy and Astrophysics, volume 610A, 88-88 (2018/2-1)

Changes in the cyclotron line energy on short and long timescales in V 0332+53.

VYBORNOV V., DOROSHENKO V., STAUBERT R. and SANTANGELO A.

Abstract (from CDS):

We present the results of the pulse-amplitude-resolved spectroscopy of the accreting pulsar V 0332+53 using the NuSTAR observations of the source in 2015 and 2016. We investigate the dependence of the energy of the cyclotron resonant scattering feature (CRSF) as a function of X-ray luminosity on timescales comparable with the spin period of the pulsar within individual observations, and the behavior on longer timescales within and between the two observed outbursts. We confirm that in both cases the CRSF energy is negatively correlated with flux at luminosities higher than the critical luminosity and is positively correlated at lower luminosities. We also confirm the recently reported gradual decrease in the line energy during the giant outburst in 2015. Using the NuSTAR data, we find that this decrease was consistent with a linear decay throughout most of the outburst, and flattened or even reversed at the end of the 2015 outburst, approximately simultaneously with the transition to the subcritical regime. We also confirm that by the following outburst in 2016 the line energy rebounded to previous values. The observed behavior of the CRSF energy with time is discussed in terms of changes in the geometry of the CRSF forming region caused by changes in the effective magnetospheric radius.

Abstract Copyright: © ESO 2018

Journal keyword(s): X-rays: binaries - stars: magnetic field - pulsars: individual: V 0332+53 - accretion, accretion disks

Simbad objects: 6

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Number of rows : 6
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* BQ Cam HXB 03 34 59.9116460415 +53 10 23.296351781   17.16 15.42 14.26 13.04 O8.5Ve 413 1
2 HD 245770 HXB 05 38 54.5749436467 +26 18 56.839215267 9.30 9.84 9.39 8.77 8.30 O9/B0III/Ve 900 0
3 V* GP Vel HXB 09 02 06.8610736194 -40 33 16.896402010 6.85 7.37 6.87 6.31 6.05 B0.5Ia 1398 0
4 V* V850 Cen HXB 13 01 17.0966951298 -61 36 06.636402972   15.6 14.40     B2Vne 286 0
5 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1961 0
6 V* V490 Cep HXB 21 39 30.6903601561 +56 59 10.421972716   15.2       B1.5Ve 136 1

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2021.09.22-04:15:50

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