Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5755b&link_type=abstract
HST Proposal ID #5755
Computer Science
Hst Proposal Id #5755 Binaries And Star Fo
Scientific paper
FRUCHTER ET AL. (1988A) HAVE RECENTLY DISCOVERED A 1.6 MSEC PULSAR (PSR 1957+20) IN A 9.2 HOUR ECLIPSINGBINARY SYSTEM. THE UNUSUAL BEHAVIOR OF THE DISPERSION MEASURE AS A FUNCTION OF ORBITAL PHASE, AND THEDISAPPEARANCE OF THE PULSAR SIGNAL FOR 50 MINUTES DURING EACH ORBIT, IMPLIES THAT THE ECLIPSES ARE DUE TO APULSAR-INDUCED WIND FLOWING OFF OF THE COMPANION. THE OPTICAL COUNTERPART IS A 21ST MAGNITUDE OBJECT WHICHVARIES IN INTENSITY OVER THE BINARY PERIOD; ACCURATE GROUND-BASED OBSERVATIONS ARE PREVENTED BY THEPROXIMITY (0.7") OF A 20TH MAGNITUDE K DWARF. WE PROPOSE TO OBSERVE THE OPTICAL COUNTERPART IN A TWO-PARTSTUDY. WE PROPOSE TO OBSERVE THE EXPECTED UV LINE EMISSION WITH FOS, ALLOWING FOR AN INTIAL DETERMINATION OFTHE TEMPERATURE AND DENSITY STRUCTURE AND ABUNDANCES OF THE WIND THAT IS BEING ABLATED FROM THE COMPANION.STUDY OF THIS UNIQUE SYSTEM HOLDS ENORMOUS POTENTIAL FOR THE UNDERSTANDING OF THE RADIATION FIELD OF AMILLISECOND PULSAR AND THE EVOLUTION OF LMXRBS AND MSPS IN GENERAL. WE EXPECT THESE OBSERVATIONS TO PLACEVERY SIGNIFICANT CONTRAINTS ON MODELS OF THIS UNIQUE OBJECT.
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