C.D.S. - SIMBAD4 rel 1.7 - 2020.08.04CEST09:22:35

2011A&A...532A..99V - Astronomy and Astrophysics, volume 532A, 99-99 (2011/8-1)

Hercules X-1: the positive cyclotron line energy/luminosity correlation.


Abstract (from CDS):

Studies of some bright, super-Eddington transient pulsars show a negative correlation between the energy of the cyclotron resonance scattering feature (CRSF) and the bolometric luminosity. For Her X-1, using repeated RXTE observations during 1996-2005, the inverse dependence was found: the energy of the cyclotron line increases as the luminosity increases. The X-ray flux measured by the RXTE/ASM (2-10keV) has been assumed to represent the luminosity - more precisely: the maximum X-ray flux reached during the respective 35d Main-On. Here, we question whether the ASM flux is really an accurate measure of the bolometric luminosity of the source. We redetermined the energy of the cyclotron line and performed spectral fits using the combined data from the PCA (3.5-60keV) and HEXTE (20-75keV) instruments on RXTE of the same 35d cycles as used in the original work to determine the bolometric flux from those spectra. We confirm the result of the original analysis that the cyclotron line energy changes by ∼7% for a change in flux by a factor of two.

Abstract Copyright:

Journal keyword(s): pulsars: individual: Her X-1 - stars: neutron - binaries: general

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 V* V635 Cas HXB 01 18 31.9704429246 +63 44 33.071137750 17.05 16.64 15.19 14.34 13.22 B0.2Ve 663 0
2 V* BQ Cam HXB 03 34 59.9116460415 +53 10 23.296351781   17.16 15.42 14.26 13.04 O8.5Ve 400 1
3 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4003 3
4 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1924 0

    Equat.    Gal    SGal    Ecl

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