Exosat observations of 4U 1705-44 - Type I bursts and persistent emission

Journal Article · Tue Dec 01 00:00:00 EST 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165826· OSTI ID:5477537

Langmeier, A; Sztajno, M; Hasinger, G; Truemper, J; Gottwald, M

During four Exosat observations, the bright galactic X-ray source 4U 1705-44 exhibited persistent emission variations from 1.3 to 10.7 x 10 to the -9th ergs/sq cm per sec in the 1-20 keV band. Type I X-ray bursts have been detected from this source whose properties correlate with source intensity. The burst shape changed with increasing intensity from a slow burst profile with a decay time of 100 sec to a feast profile with a decay time of 25 sec. The spectrum during maximum was best-fitted by a two-component model involving a blackbody together with a Boltzmann-Wien law, and an additional iron K emission line. 28 references.

• Research Organization: Max-Planck-Institut fuer Extraterrestrische Physik, Garching, Germany, F.R.; EXOSAT Observatory, Noordwijk, Netherlands
• OSTI ID: 5477537
• Journal Information: Astrophys. J.; (United States), Vol. 323
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC X-RAY SOURCES
VARIATIONS
BINARY STARS
BLACKBODY RADIATION
COSMIC X-RAY BURSTS
EMISSION SPECTRA
MILKY WAY
RADIANT FLUX DENSITY
COSMIC RAY SOURCES
ELECTROMAGNETIC RADIATION
FLUX DENSITY
GALAXIES
RADIATIONS
SPECTRA
STARS
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources