SUMMARY OF PROPOSAL 82011

DR. STEPHEN A. DRAKE
DRAKE@Oheasarc.gsfc.nasa.gov

NASA'S GODDARD SPACE FLIGHT CENTER

GREENBELT
MD USA 20771
Tel: 301 286 6962 Fax: 301 286 1684
Medium: CD ROM
Subject: STARS

X-RAY MONITORING OF THE ECLIPSING RS CVN SYSTEM AR LAC


ABSTRACT

AR Lac is an eclipsing RS CVn binary system of 2 days orbital period which has been extensively studied by most X-ray satellites since Einstein, but typically in observations that are similar or shorter in length to its orbital period. This limitation has compromised previous attempts to do eclipse-mapping studies of the spatial distribution of the coronal plasma in this system, because of the difficulty of distinguishing between transient events and persistent spatial structures. In this proposal, we ask for 360 ksec of exposure time so as to observe 5 orbital periods of AR Lac which will allow us to eliminate this uncertainty. We will also study AR Lac's X-ray flare frequency, and do time-resolved (e.g., phase-binned) spectroscopy.

CO-INVESTIGATORS
CO-I NAME INSTITUTE COUNTRY
NICHOLAS WHITEGSFCUSA
THEODORE SIMONUNIV. OF HAWAIIUSA
MARTIN STILLGSFCUSA
ANDREW COLLIER-CAMERONUNIV. OF ST. ANDREWSUK
KULINDER PAL SINGHTIFRINDIA

TARGETS

TARGET NAMEPRIRADECTIMETCOFFGISSIS CNTOBS
1)AR LAC
A
332.1700 45.7422
400 ks
N
N
P
1.50000
1