SUMMARY OF PROPOSAL 43009
PROF., DR. JOACHIM TRUEMPER
MAX-PLANCK-INSTITUT FUER EXTRATERRESTRISCHE PHYSIK
 GERMANY 85740
GARCHING BEI MUENCHEN
GIESSENBACHSTRASSE

  E-mail: JTRUMPER@MPE-GARCHING.MPG.DE	Tel: (089)3299-3559	Fax: (089)3299-3569
  Medium: 4GBDAT

Subject: STARS                                                       
  Title: ASCA OBSERVATION OF PSR J0538+2817                                              


Abstract:
 X-ray emission was discovered from the pulsar PSR J0538+2817 during the ROSAT All
 Sky Survey (RASS). It is the oldest among the neutron stars (<10^6 yr) which cooling
 surface emission is suitable for X-ray observation. RASS exposure is, however, not
 enough to distinguish whether it is magneto-rotation driven or cooling emission. The
 upper limit of its gamma-ray emission efficiency is about 0.03, much lower than the
 predictions from both polar cap model and empirical fitting of known $\gamma$-ray
 pulsars, and much lower than in the case of its twin-PSR1055-52. The proposed
 observation would help to clearify the nature of the X-ray emission of this pulsar.

 Co-Is:
   1  XUEJUN SUN          	MPE $\&$ IHEPB                CHINA     
      XSUN@MPE-GARCHING.MPG.DE	(089)3299-3502


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
PSR J0538+2817         3   84.6042   28.2864    40   N   N   P  0.02000   1