SUMMARY OF PROPOSAL 73004

PROF. JURGEN H.M.M. SCHMITT
JSCHMITT@HS.UNI-HAMBURG.DE

HAMBURGER STERNWARTE
GOJENBERGSWEG 112
HAMBURG
HAMBURG GERMANY 21029
Tel: 40 7252 4131 Fax: 40 7252 4198
Medium: CD ROM
Subject: STARS

X-RAY ECLIPSES IN CF TUC


ABSTRACT

We propose to use the ASCA satellite to systematically study the X-ray light curve of the the eclipsing binary CF Tuc concentrating on the time of the optical primary minimum. The main goal of the proposed study is to see whether an X-ray eclipse of the smaller G star by the larger and more rapidly rotating K star is a persistent feature of the light curve. The persistent occurrence of X-ray eclipses has important consequences for the structural stability of CF Tuc's corona as well as its spatial confinement.

CO-INVESTIGATORS
CO-I NAME INSTITUTE COUNTRY
MARTIN K\"URSTERESOCHILE

TARGETS

TARGET NAMEPRIRADECTIMETCOFFGISSIS CNTOBS
1)CF TUC
A
 13.2700-74.6520
98 ks
N
Y
P
0.45000
1

TARGET 1

THE OBSERVATIONS SHOULD BE STARTED 13 HOURS BEFORE PRIMARY MINIMUM. A LIST OF PRIMARY MINIMA IS AVAILABLE FROM THE PI.