3 papers
astro-ph1998
Evidence for evolving accretion disk structure in 4U 1957+115
Pasi Hakala, Panu Muhli, Guillaume Dubus
We present results of the first multicolour photometric study of 4U1957+115, one of the optically less studied low mass X-ray binaries (LMXB). Our quasi-simultaneous UBVRI observat…
astro-ph1997
Evidence for Diverse Optical Emission from Gamma-Ray Burst Sources
H. Pedersen, A. O. Jaunsen, T. Grav +25
Optical Transients from gamma-ray burst sources, in addition to offering a distance determination, convey important information on the physics of the emission mechanism, and perhap…
astro-ph1996
The Great Annihilator 1E1740.7-2942: Molecular cloud connection and coronal structure
O. Vilhu, D. Hannikainen, P. Muhli +4
Using 12CO and 13CO observations we present column density maps of the molecular cloud (V = -135 km/s) in the direction of 1E1740.7-2942. Hydrogen column densities of the cloud sca…