SUMMARY OF PROPOSAL 42006
DR. ALEXANDER BROWN
UNIVERSITY OF COLORADO
CO USA 80309-0389
BOULDER
CAMPUS BOX 389

  E-mail: AB@ECHIDNA.COLORADO.EDU	Tel: 303-492-7810	Fax: 303-492-7178
  Medium: 5GB8MM

Subject: STARS                                                       
  Title: ACTIVITY ON THE EDGE OF CONVECTION: THE ATMOSPHERE OF CANOPUS (ALPHA CAR, F0 IB-II)


Abstract:
 Canopus (F0 Ib-II) is the nearest (40 pc) supergiant to the Sun. It is the only
 late-type supergiant detected in both the EUVE and ROSAT WFC all-sky surveys and is
 the brightest F supergiant X-ray source detected by Einstein. We propose a 40 ksec
 ASCA observation of Canopus to determine the coronal temperature and EM distribution
 for a supergiant with a very thin convection zone. In conjunction with EUVE and HST
 data, this will allow us to investigate the coronal energy balance, possible
 magnetic loop properties (e.g. likely field strengths), possible coronal heating
 mechanisms, and their relationship to the TR nonthermal velocities and energies.
 These results will be compared to our ASCA analysis of Beta Dra, a G2 supergiant
 with similar surface gravity but much thicker convection zone.

 Co-Is:
   1  STEPHEN SKINNER     	JILA, U. OF COLORADO          USA       
      (No Co-I contact data)
   2  TOM AYRES           	CASA, U. OF COLORADO          USA       


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
HD45348                0   95.9883  -52.6956    40   N   Y   P  0.24000   1