65 citations · 396 across the 26 of their papers we have counts for
25 papers
A Definitive Determination of the Interstellar Carbon Abundance toward rho Ophiuchi A and B
Adam M. Ritchey, S. R. Federman, Daniel E. Welty +1
We present the results of an effort to derive interstellar gas-phase C II abundances along the lines of sight toward rho Oph A and B. Our analysis is based on high-resolution NUV a…
A refined search for high-velocity gas in the Cygnus Loop supernova remnant
Adam M. Ritchey, S. R. Federman, David L. Lambert
We present the results of a sensitive search for high-velocity gas in interstellar absorption lines associated with the Cygnus Loop supernova remnant (SNR). We examine high-resolut…
Observations of Multiphase, High-Velocity, Shocked Gas in the Vela Supernova Remnant
Adam M. Ritchey
We present an analysis of high-resolution far-ultraviolet archival spectra obtained with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope of the star HD 75309…
A Reexamination of Phosphorus and Chlorine Depletions in the Diffuse Interstellar Medium
Adam M. Ritchey, J. M. Brown, S. R. Federman +1
We present a comprehensive examination of interstellar P and Cl abundances based on an analysis of archival spectra acquired with the Space Telescope Imaging Spectrograph of the Hu…
The Distribution of Metallicities in the Local Galactic Interstellar Medium
Adam M. Ritchey, Edward B. Jenkins, J. Michael Shull +3
In this investigation, we present an analysis of the metallicity distribution that pertains to neutral gas in the local Galactic interstellar medium (ISM). We derive relative ISM m…
The Transition from Diffuse Molecular Gas to Molecular Cloud Material in Taurus
S. R. Federman, Johnathan S. Rice, A. M. Ritchey +6
We study four lines of sight that probe the transition from diffuse molecular gas to molecular cloud material in Taurus. Measurements of atomic and molecular absorption are used to…
High-velocity interstellar absorption associated with the supernova remnant W28
Adam M. Ritchey
We present an analysis of moderately high resolution optical spectra obtained for the sight line to CD-23 13777, an O9 supergiant that probes high velocity interstellar gas associa…
Physical Conditions in Shocked Interstellar Gas Interacting with the Supernova Remnant IC 443
Adam M. Ritchey, Edward B. Jenkins, Steven R. Federman +3
We present the results of a detailed investigation into the physical conditions in interstellar material interacting with the supernova remnant IC 443. Our analysis is based on a c…
Abundances and Depletions of Neutron-Capture Elements in the Interstellar Medium
Adam M. Ritchey, Steven R. Federman, David L. Lambert
We present an extensive analysis of the gas-phase abundances and depletion behaviors of neutron-capture elements in the interstellar medium (ISM). Column densities (or upper limits…
Parsec-scale Variations in the 7Li/6Li Isotope Ratio Toward IC 348 and the Per OB 2 Association
D. C. Knauth, C. J. Taylor, A. M. Ritchey +2
Measurements of the lithium isotopic ratio in the diffuse interstellar medium from high-resolution spectra of the LiI λ6708 resonance doublet have now been reported for a number of…
Lifetimes and Oscillator Strengths for Ultraviolet Transitions in Singly-Ionized Lead
Negar Heidarian, Richard E. Irving, Adam. M. Ritchey +5
We present the results of lifetime measurements made using beam-foil techniques on levels of astrophysical interest in Pb II producing lines at 1203.6 A ( )…
The CN/CN Ratio in Diffuse Molecular Clouds
Adam M. Ritchey, Steven R. Federman, David L. Lambert
We report the first detection of CN in diffuse molecular gas from a detailed examination of CN absorption lines in archival VLT/UVES spectra of stars probing local diffuse c…
The Interstellar Line of Sight to the Interacting Galaxy NGC 5195
Adam M. Ritchey, George Wallerstein
We present moderately-high resolution echelle observations of the nucleus of NGC 5195, the line of sight to which samples intervening interstellar material associated with the oute…
Diffuse Atomic and Molecular Gas in the Interstellar Medium of M82 toward SN 2014J
Adam M. Ritchey, Daniel E. Welty, Julie A. Dahlstrom +1
We present a comprehensive analysis of interstellar absorption lines seen in moderately-high resolution, high signal-to-noise ratio optical spectra of SN 2014J in M82. Our observat…
Diffuse Interstellar Bands vs. Known Atomic and Molecular Species in the Interstellar Medium of M82 toward SN 2014J
Daniel E. Welty, Adam M. Ritchey, Julie A. Dahlstrom +1
We discuss the absorption due to various constituents of the interstellar medium of M82 seen in moderately high resolution, high signal-to-noise ratio optical spectra of SN 2014J.…
OH+ in Diffuse Molecular Clouds
A. J. Porras, S. R. Federman, D. E. Welty +1
Near ultraviolet observations of OH+ and OH in diffuse molecular clouds reveal a preference for different environments. The dominant absorption feature in OH+ arises from a main co…
Interstellar Absorption Lines in the Direction of the Cataclysmic Variable SS Cygni
Adam M. Ritchey, George Wallerstein, Jean McKeever
We present an analysis of interstellar absorption lines in high-resolution optical echelle spectra of SS Cyg obtained during an outburst in 2013 June and in archival Hubble Space T…
Abundances in Stars with Debris Disks
Adam M. Ritchey, Guillermo Gonzalez, Myra Stone +1
We present preliminary results of a detailed chemical abundance analysis for a sample of solar-type stars known to exhibit excess infrared emission associated with dusty debris dis…
The optical photometric and spectroscopic investigation of Type IIP supernova 2012A
Rupak Roy, Firoza Sutaria, Subhash Bose +11
Supernova 2012A was discovered on 7.39UT, January, 2012 in the nearby galaxy NGC 3239 at an unfiltered magnitude of 14.6 and classified spectroscopically as a Type IIP event. Here,…
The 7Li/6Li Isotope Ratio Near the Supernova Remnant IC 443
C. J. Taylor, A. M. Ritchey, S. R. Federman +1
We present an analysis of 7Li/6Li isotope ratios along four sight lines that probe diffuse molecular gas near the supernova remnant IC 443. Recent gamma-ray observations have revea…
Interstellar Sodium and Calcium Absorption toward SN 2011dh in M51
Adam M. Ritchey, George Wallerstein
We present high-resolution echelle observations of SN 2011dh, which exploded in the nearby, nearly face-on spiral galaxy M51. Our data, acquired on three nights when the supernova…
The Abundance of Boron in Diffuse Interstellar Clouds
A. M. Ritchey, S. R. Federman, Y. Sheffer +1
We present a comprehensive survey of boron abundances in diffuse interstellar clouds from observations made with the Space Telescope Imaging Spectrograph (STIS) of the Hubble Space…
Interstellar CN and CH+ in Diffuse Molecular Clouds: 12C/13C Ratios and CN Excitation
A. M. Ritchey, S. R. Federman, D. L. Lambert
We present very high signal-to-noise ratio absorption-line observations of CN and CH+ along 13 lines of sight through diffuse molecular clouds. The data are examined to extract pre…
Boron Abundances in Diffuse Interstellar Clouds
A. M. Ritchey, S. R. Federman, Y. Sheffer +1
We present a comprehensive survey of B abundances in diffuse interstellar clouds from HST/STIS observations along 56 Galactic sight lines. Our sample is the result of a complete se…