2001A&A...375..922O


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.23CEST16:48:17

2001A&A...375..922O - Astronomy and Astrophysics, volume 375, 922-926 (2001/9-1)

A BeppoSAX observation of Her X-1 during the first main-on after an anomalous low-state: Evidence for rapid spin-down.

OOSTERBROEK T., PARMAR A.N., ORLANDINI M., SEGRETO A., SANTANGELO A. and DEL SORDO S.

Abstract (from CDS):

Result. of a BeppoSAX observation of Her X-1 in 2000 October during the first main-on state after the longest recorded anomalous low-state are presented. The 0.1-30keV spectrum, light curve and pulse profile are all consistent with those measured during previous main on-states, indicating that Her X-1 has resumed its regular 35 day cycle with similar on-state properties as before. However, from a comparison of the measured pulse period with that obtained close to the start of the anomalous low-state, it is evident that Her X-1 continued to spin-down strongly during the anomalous low-state such that the pulse period has returned to a similar value as ∼15 years ago. Additionally, the occurrence time of the main-on states after the end of the anomalous low-state indicate that a change in the length, or phasing, of the 35-day cycle occurred during the anomalous low-state.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - X-rays: binaries - stars individual: Her X-1

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 V* KZ TrA LXB 16 32 16.79 -67 27 39.3 17.40 18.60 18.5     ~ 519 1
2 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1899 0

    Equat.    Gal    SGal    Ecl

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2019.09.23-16:48:17

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