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Description Catalog Data Default Radius (arcmin) Mission Table Type
ROSAT Proposal Abstracts rosprspecY
ROSAT Proposal

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 Parameter (Unit) Min Value Max Value Value Type
ao_period 0 8 integer
pinb 1 8004 integer
prnb 1 30000 integer
title NOVA MUSCAE 1991 - A POSSIBLE BLACK HOLE X-RAY TRANSIENT z= 0.10 - 0.15 clusters from the ROSAT Sky Survey string
tns 0 202 integer
nat_tns 1 184 integer
int_tns 0 184 integer
sub_cat 0 10 integer
      abstract ALGOL-type semi-detached binary systems do not form a homogeneous class, &blanket statements about their x-ray properties are likely to mislead. We have selected an active Algol subgroup having strong, high-ionsization UV emission lines. The UV emission likely arises in an extended region that is in collisional equillibrium, & to further understand this process we will search for X-ray evidence of gas w/ T<a few million K. ROSAT is well-suited to this task. strong coronal emission at 10 million K from the secondary stars is not expected since they are typically of type A-F. the targets are well-studied in the visible & UV, & NH is known. we will obtain deep enough exposures to assure a useful characterization of LX & T, using a hardness ratio. we propose to study the puzzling properties of highly luminous supersoftX-ray sources which are now established to be an important new class of astrophysical objects in nearby galaxies. In case that they turn out to be low mass X-ray binaries a sizable but largely hiddden galactic population of these objects would help to solve the millisecond pulsar problem.This suggestion and the alternative hypothesis of a hydrogen burning white dwarf nature can be adressed by one deep observation and repeated pointings of the prototype CAL 83 in the Large Magellanic Cloud, and by PSPC observations of two recently discovered supersoft sources in the Small Cloud. string

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