Cyanopolyyne Chemistry in the L1544 Prestellar Core: New Insights from GBT Observations
The Astrophysical Journal, 2023 We report a comprehensive study of the cyanopolyyne chemistry in the prototypical prestellar core L1544. Using the 100 m Robert C. Byrd Green Bank Telescope, we observe three emission lines of HC _3 N, nine lines of HC _5 N, five lines of HC _7 N, and ...
Eleonora Bianchi +11 more
doaj +1 more source
The abundance of interstellar OD
The Astrophysical Journal, 1985 We present the chemistry of OD and estimate the abundance of OD in diffuse and dense molecular clouds. We predict substantial enhancements in the abundance of OD relative to OH and argue that density ratios of 0.01 or greater are likely in many clouds. A search could add OD to the list of known interstellar molecules.
K. Croswell, A. Dalgarno
openaire +1 more source
The Origin of Cosmic Rays: How Their Composition Defines Their Sources and Sites, and the Processes of Their Mixing, Injection and Acceleration [PDF]
, 1976 Galactic cosmic-ray source compositions, (Z/H)GCRS from H to Pb and ~10^8 - 10^14 eV, differ from solar-local interstellar, (Z/H)SS or (Z/H)ISM by ~20-200x.
Lingenfelter, Richard E.
core +7 more sources
Modulation of neutral interstellar He, Ne, O in the heliosphere. Survival probabilities and abundances at IBEX [PDF]
, 2013 Direct sampling of neutral interstellar (NIS) atoms by the Interstellar Boundary Explorer (IBEX) can potentially provide a complementary method for studying element abundances in the Local Interstellar Cloud and processes in the heliosphere interface ...
M. Bzowski +3 more
semanticscholar +1 more source
Solar Elemental Abundances [PDF]
Oxford Research Encyclopedia of Planetary Science, 2019 Solar elemental abundances, or solar system elemental abundances, refer to the complement of chemical elements in the entire Solar System. The Sun contains more than 99% of the mass in the solar system and therefore the composition of the Sun is a good ...
K. Lodders
semanticscholar +1 more source
Present-day cosmic abundances - A comprehensive study of nearby early B-type stars and implications for stellar and Galactic evolution and interstellar dust models [PDF]
, 2012 Aims. A carefully selected sample of early B-type stars in OB associations and the field within the solar neighbourhood is studi ed comprehensively. Present-day abundances for the astrophysically most interesting chemical elements are derived in order to
M. Nieva, N. Przybilla
semanticscholar +1 more source
The Interaction Between Accretion from the Interstellar Medium and Accretion from the Evolved Binary Component in Barium Stars [PDF]
Journal of Astronomy and Space Sciences, 2018 The reanalysis of the previously published abundance pattern of mild barium star HD202109 (ζ Cyg) and the chemical compositions of 129 thin disk barium stars facilitated the search for possible correlations of different stellar parameters with second ...
Yeuncheol Jeong +2 more
doaj +1 more source
Efficient Production of S8 in Interstellar Ices: The Effects of Cosmic-Ray-driven Radiation Chemistry and Nondiffusive Bulk Reactions [PDF]
Astrophysical Journal, 2019 In this work, we reexamine sulfur chemistry occurring on and in the ice mantles of interstellar dust grains, and report the effects of two new modifications to standard astrochemical models: namely, (a) the incorporation of cosmic-ray-driven radiation ...
C. Shingledecker +6 more
semanticscholar +1 more source
Shaken or Stirred: The Diffuse Interstellar Medium with Exceptionally High SiO Abundance
The Astrophysical Journal, 2023 Interstellar shocks, a key element of stellar feedback processes, shape the structure of the interstellar medium (ISM) and are essential for the chemistry, thermodynamics, and kinematics of interstellar gas.
Daniel R. Rybarczyk +2 more
doaj +1 more source
Frontiers in Astronomy and Space Sciences, 2021 The huge variety of planetary systems discovered in recent decades likely depends on the early history of their formation. In this contribution, we introduce the FAUST Large Program which focuses specifically on the early history of solar-like protostars
C. Codella +6 more
doaj +1 more source