22 citations · 61 across the 6 of their papers we have counts for
7 papers
Astro2020 Activities and Projects White Paper: Arecibo Observatory in the Next Decade
D. Anish Roshi, L. D. Anderson, E. Araya +42
The white paper discusses Arecibo Observatory's plan for facility improvements and activities over the next decade. The facility improvements include: (a) improving the telescope s…
Iridium Satellite Signals: A Case Study in Interference Characterization and Mitigation for Radio Astronomy Observations
Avinash A. Deshpande, B. M. Lewis
Several post-detection approaches to the mitigation of radio-frequency interference (RFI) are compared by applying them to the strong RFI from the Iridium satellites. These provide…
Maser Properties of the Enigmatic IRAS Source 19312+1950
Jun-ichi Nakashima, Shuji Deguchi, Hiroshi Imai +2
The IRAS source, 19312+1950, exhibits SiO maser emission, which is predominantly detected in evolved stars enshrouded by a cold molecular envelope. In fact, the mojority of the obs…
A turn-key Concept for active cancellation of Global Positioning System L3 Signal
Lou Nigra, B. Murray Lewis, Clyde Edgar +4
We present a concept, developed at the National Astronomy and Ionosphere Center (NAIC) at Arecibo, Puerto Rico, for active suppression of Global Positioning System (GPS) signals in…
Evolution of 1612 MHz Maser Emission in Expanding Circumstellar Shells
M. D. Gray D. A. Howe, B. M. Lewis
Observations show that 1612 MHz masers of OH/IR stars can fade on a timescale of a decade. This fading is probably associated with the switch from rapid mass loss, which is ultimat…
On spherically-symmetric accretion by a collisionless polytrope
B. M. Lewis
An isolated, spherically-symmetric, self-gravitating, collisionless system is always a polytrope when it reaches equilibrium (Nakamura 2000). This strongly suggests as a corollary,…