RXTE/ASM Observations of the 35-day Cycle of Her X-1
| dc.creator | Leahy, D. Matthew Scott Denis A. | |
| dc.date | 1998-09-11 | |
| dc.date.accessioned | 2026-07-07T02:27:54Z | |
| dc.date.available | 2026-07-07T02:27:54Z | |
| dc.description | Her X-1 has been monitored nearly continuously in soft X-rays (2-12 keV) since February 1996 by the ASM on board RXTE. We present analysis of these observations which include 23 contiguous 35-day cycles. We present the best yet average 35-day cycle lightcurve for Her X-1. 35-day lightcurve features such as eclipses and absorption dips, and the alternating occurrence of the Main High and Short High states, are well measured. The occurrence of X-ray eclipse during the Low state is confirmed as is the presence of Main High states that ``turn-on'' sharply at orbital phases 0.23 and 0.68. The Main High state covers 35-day phase 0-0.31 and the Short High state covers phase 0.57-0.79, with phase 0 defined by Main High state turn-on. We find extended ingresses and egresses for the Short High state. Marching pre-eclipse absorption dips progressively become shallower during the Main High state. The marching pre-eclipse dip period is best determined from reanalysis of archival data as 1.651 +/- .002 days if the dip marching can be extrapolated from the Main High state into the Short High state or 1.646 +/- .003 using dips within single Main High states alone. | |
| dc.description | 20 pages latex, 7 postscript figures, accepted by The Astrophysical Journal | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9809152 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9809152 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/12892 | |
| dc.subject | Astrophysics | |
| dc.title | RXTE/ASM Observations of the 35-day Cycle of Her X-1 | |
| dc.type | text |