SUMMARY OF PROPOSAL 73005

DR. BARBARA JANE HASSALL
B.J.M.HASSALL@UCLAN.AC.UK

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 NAYLORKEELE UNIVERSITYUK
GABRIEL PRATTUNIV. CEN. LANCS.UK
KOJI MUKAINASA-GSFC/USRAUSA
JANET WOODKEELE UNIVERSITYUK

TARGETS

TARGET NAMEPRIRADECTIMETCOFFGISSIS CNTOBS
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