283 citations · 797 across the 15 of their papers we have counts for
8 papers · 1 filter
Ultraviolet Survey of CO and H_2 in Diffuse Molecular Clouds: The Reflection of Two Photochemistry Regimes in Abundance Relationships
Y. Sheffer, M. Rogers, S. R. Federman +4
(Abridged) We carried out a comprehensive far-ultraviolet (UV) survey of ^12CO and H_2 column densities along diffuse molecular Galactic sight lines in order to explore in detail t…
Hubble Space Telescope Measurements of Vacuum Ultraviolet Lines of Interstellar CH
Y. Sheffer, S. R. Federman
Three interstellar absorption lines near 1370 A seen toward zeta Oph have been assigned by Watson to Rydberg transitions in the G-X (or 3d-X) band of CH. Our survey of a dozen diff…
FUSE Measurements of Interstellar Fluorine
S. R. Federman, Yaron Sheffer, David L. Lambert +1
The source of fluorine is not well understood, although core-collapse supernovae, Wolf-Rayet stars, and asymptotic giant branch stars have been suggested. A search for evidence of…
FUSE Measurements of Rydberg Bands of Interstellar CO between 925 and 1150 A
Y. Sheffer, S. R. Federman, B. -G. Andersson
We report the detection of 11 Rydberg bands of CO in FUSE spectra of the sight line toward HD203374A. Eight of these electronic bands are seen in the interstellar medium for the fi…
Further Evidence for Chemical Fractionation from Ultraviolet Observations of Carbon Monoxide
S. R. Federman, David L. Lambert, Yaron Sheffer +4
Ultraviolet absorption from interstellar 12CO and 13CO was detected toward rho Oph A and chi Oph. The measurements were obtained at medium resolution with the Goddard High Resoluti…
Ultraviolet Detection of Interstellar 12C17O and the CO Isotopomeric Ratios toward X Persei
Yaron Sheffer, David L. Lambert, S. R. Federman
We report the detection of fully resolved absorption lines of A-X bands from interstellar 12C17O and 12C18O, through high-resolution spectroscopy of X Per with the Space Telescope…