SUMMARY OF SEQUENCE NUMBER 400073
SUMMARY OF SEQUENCE NUMBER 400073
Title: HETG ZERO PHASE SPECTROSCOPY OF CIRCINUS X-1
Observer: BRANDT
Subject Category: BH and NS Binaries
Seq: 400073 ObsId: 01700
Long-term Plan bin: 7-Jun-2000
ABSTRACT
We propose to make the first grating-resolution X-ray spectra of Cir X-1 during one of its zero phase passages. Our ASCA analyses of Cir X-1 have shown that its variable iron K features can be explained using a direct flux plus scattered flux model, and HETG spectra will test our model. During zero phase `dips' we expect line emission from an accretion disk corona (ADC), since we predict predominantly ADC scattered emission below 5 keV. Line measurements will constrain the ADC ionization parameter, temperature, thickness and motion. We will also make the highest resolution iron K line/edge measurements and use them to study obscuring matter. Our observation will not cause telemetry saturation, and our dispersed spectra will not have serious photon pile up.
TARGET SUMMARY
| TARGET NAME |
RA | DEC |
TIME |
SI |
GRAT |
TYPE |
TC |
ROLL |
PRE |
PHASE |
MULTI |
PRI |
| CIR X-1 |
230.170833 | -57.166667 |
15.00000 |
ACIS-S |
HETG |
GO |
yes |
no |
no |
yes |
yes |
5 |
IMAGES
(NOTE: RASS images currently only available for targets LTS scheduled on or after Apr-09-2000)
PARAMETERS
Obscat Parameters
