SUMMARY OF PROPOSAL 42007
DR. STEPHEN A. DRAKE
USRA AND LHEA
MD USA 20771
GREENBELT
GODDARD SPACE FLIGHT CENTER

  E-mail: DRAKE@LHEAVX.GSFC.NASA.GOV	Tel: 301 286 6962	Fax: 301 286 1684
  Medium: 4GBDAT

Subject: STARS                                                       
  Title: A JOINT ASCA AND XTE OBSERVATION OF THE RS CVN BINARY HR 1099: DEFINING THE NATURE OF THE HARD X-RAY EMISSION


Abstract:
 We have been awarded 40 ksec of XTE time to observe the hard X-ray spectrum of the
 prototypical RS CVn binary HR 1099. This will enable us to detect its X-ray spectrum
 up to 35 keV even in its quiescent state, and to even harder energies if it flares.
 We propose to obtain an ASCA observation simultaneously with this XTE observation,
 so that we can obtain a moderate spectral resolution spectrum of the .5-8 keV range
 to complement the low-resolution (but broad-band) XTE spectrum. This joint
 observation should enable us to accurately characterize the coronal components
 present in HR 1099, and to search for a proposed hard X-ray emission component.
 There is a good chance that the X-ray emission will be variable, and if so we will
 study the spectral variability as a function of time

 Co-Is:
   1  THEODORE SIMON      	UNIV. OF HAWAII               USA       
      WHITE@LHEAVX.GSFC.NASA.GOV	301 286 8443
   2  THOMAS AYRES        	UNIV. OF COLORADO             USA       
   3  KULINDER PAL SINGH  	NASA/GSFC                     USA       
   4  NICHOLAS WHITE      	NASA/GSFC                     USA       
   5  ALEX ANTUNES        	NASA/GSFC                     USA       


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
HR 1099 = V711 TAU     0   54.1967    0.5878    40   N   N   P  3.00000   1 

REMARKS:  THIS IS AN ASCA OBSERVATION THAT IS TO BE MADE SIMULTANEOUSLY WITH AN XTE
          OBSERVATION. XTE WILL ADJUST ITS SCHEDULE TO MATCH THE ASCA OBSERVATION,
          WHENEVER THE LATTER IS SCHEDULED.