Observations of Water Vapor Outflow from NML Cygnus

Observations of Water Vapor Outflow from Nml Cygnus

We report new observations of the far infrared and submillimeter water vapor emission of NML Cygnus based on data gathered with the Infrared Space Observatory and the Submillimeter Wave Astronomy Satellite. We compare the emission from NML Cyg to that previously published for VY CMa and W Hya in an attempt to establish the validity of recently proposed models for the outflow from evolved stars....

A clear-sky radiance archive from Meteosat ”water vapor” observations

The remarkable asymmetric outflow from the Cygnus Egg Nebula

We present ground based continuum images in the infrared, from 1.2 to 19μm, and an H2 2.122μm line emission image of the post-AGB star AFGL2688, the Cygnus Egg Nebula. We show that the standard model of this source, comprising a fast wind focussed by a dense, equatorial, dusty torus into a bipolar flow at position angle 15◦ and close to the plane of the sky, cannot explain the combination of ki...

Nonuniform Dust Outflow Observed around Infrared Object Nml Cygni

Measurements by the University of California Berkeley Infrared Spatial Interferometer at 11.15 km have yielded strong evidence for multiple dust shells and/or signiÐcant asymmetric dust emission around NML Cyg. New observations reported also include multiple 8È13 km spectra taken from 1994È1995 and N-band (10.2 km) photometry from 1980È1992. These and past measurements are analyzed and Ðtted to...

Observations of giant outbursts from Cygnus X-1

We present interplanetary network localization, spectral, and time history information for 7 episodes of exceptionally intense gamma-ray emission from Cygnus X-1. The outbursts occurred between 1995 and 2003, with durations up to ∼28000 seconds. The observed 15 300 keV peak fluxes and fluences reached 3 × 10−7 erg cm−2s−1 and 8 × 10−4 erg cm−2 respectively. By combining the triangulations of th...