SUMMARY OF PROPOSAL 62001

DR. CAREY M. LISSE
LISSE@ASTRO.UMD.EDU

UNIVERSITY OF MARYLAND

COLLEGE PARK
MARYLAND USA 20742
Tel: 301-405-1563 Fax: 301-314-9067
Medium: 2GB8MM
Subject: COSMIC X-RAY BACKGROUND AND DEEP SURVEYS AND OTHER

X-RAY SPECTRAL AND PHOTOMETRIC EVOLUTION OF COMETS


ABSTRACT

Recent observations of comet Hyakutake and others have provided evidence of high energy emissions from comets. These observations showed positional detail, but did not have adaquate spectral resolution to discern the nature of physical processes responsible for X-ray emission. While some processes could be ruled out by X-ray broad band photometric behavior, thermal bremsstrahlung, ion charge transfer, or solar wind interactions could not. We propose to observe 2 comets during their perihelion approach using SIS to obtain data to determine the process responsible for emission. We will monitor our primary candidate over 9 days for transient emission. By observing 2 comets successively we hope to determine if xray emission dependends on each comet's characteristics or on solar activety.

CO-INVESTIGATORS
CO-I NAME INSTITUTE COUNTRY
JAMES BAUERIFA, UNIV. OF HAWAIIUSA
KAREN MEECHIFA, UNIV. OF HAWAIIUSA
PATRICK HENRYIFA, UNIV. OF HAWAIIUSA
NAOTO KOBAYASHIIFA AND KYOTO UNIV.JAPAN
YANGA FERNANDEZUNIV. OF MARYLANDUSA
KATSUJI KOYAMAKYOTO UNIV.JAPAN
ROBERT PETREGSFCUSA
BARRY KELLETTLEICESTER UNIV.UK
ROBERT BINGHAMLEICESTER UNIV.UK

TARGETS

TARGET NAMEPRIRADECTIMETCOFFGISSIS CNTOBS
1)P/TEMPEL-TUTTLE
2
36.0329 70.7829 60 ksY
N
P
0.10000
9

TARGET 1

OBS MUST TAKE PLACE AS SOON AS TARGET ENTERS ASCA'S FOV. TO KEEP COMETS IN FOV, WE REQUEST 5 SUBSEQUENT RASTER OFFSETS/POINTING. EACH OBS IS 20 KSEC, SPACED BY 1 DAY; 9 POINTINGS FOR TARGET 1.
COORDINATED OBSERVATION: START: Jan 20,1998 at 00STOP: Jan 28,1998 at 60