SUMMARY OF PROPOSAL 73005
UNIVERSITY OF CENTRAL LANCASHIRE
CORPORATION STREET
PRESTON
LANCASHIRE UK PR1 2HE
Tel: (+44) (0) 1772 893570 Fax: (+44) (0) 1772 892903
Medium: 4GBDAT
Subject: CATACLYSMIC VARIABLES
VARIABILITY WITH ORBITAL PHASE OF THE LOCAL ABSORPTION IN OY CAR
ABSTRACT
We propose to obtain phase-resolved ASCA observations of the dwarf nova OY Car during quiescence. If an X-ray eclipse of the boundary layer is seen, we will use the eclipse geometry to constrain the size and location of the X-ray emission relative to the white dwarf. We will use spectral modelling to measure the local column density at different orbital phases in a search for azimuthal asymmetry of the absorbing material. We will compare the values obtained from our X-ray measurements with those deduced from the ``iron curtain'' seen in the HST UV spectra, thereby resolving the apparent discrepancies between previous non-simultaneous measurements. This proposal is Time Critical because we are requesting HST time simultaneous with the ASCA observations.
CO-INVESTIGATORS
CO-I NAME | INSTITUTE | COUNTRY |
---|
TIM NAYLOR | KEELE UNIVERSITY | UK |
GABRIEL PRATT | UNIV. CEN. LANCS. | UK |
KOJI MUKAI | NASA-GSFC/USRA | USA |
JANET WOOD | KEELE UNIVERSITY | UK |
TARGETS
TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
---|
1)OY CAR | B | 151.5958 | -70.2350 | 60 ks | Y | N | P | 0.15000 | 1 |
TARGET 1
EPHEMERIS CENTRE: MJD 3993.053958 + 0.0631209180E. 36 HRS ELAPSED TIME ENSURES ADEQUATE BINARY PHASE COVERAGE. TIME CRITICALITY REQUIRED FOR SIMULTANEOUS WITH HST.
COORDINATED OBSERVATION: START: Jan 1,9999 at 00STOP: Jan 1,9999 at 00