منابع مشابه
Photoelectron spectroscopy of CN-, NCO-, and NCS-
The 266 nm photoelectron spectra of CN-, NCO-, and NCShave been recorded with a pulsed time-of-flight photoelectron spectrometer. The photoelectron spectrum of CNhas also been recorded at 213 nm revealing transitions to the A 211 state as well as the ground X ‘Zf state of the CN radical. The following adiabatic electron affinities (EAs) are determined: EA(CN) =3.862*0.004 eV, EA(NC0) =3.609*0.0...
متن کاملSpatially Resolved Stis Spectroscopy of Α Orionis: Evidence for Non-radial Chromospheric Oscillation from Detailed Modeling
Four spatially resolved near-UV raster scans across the chromospheric disk of α Ori, obtained with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope reveal mean chromospheric infall from 1998 January to 1998 April, which reversed to upflow in deeper layers between 1998 September and 1999 March. In 1998 September we detect systematic reversals in the component maxima of four...
متن کاملLow - resolution spectroscopy and spectral energy distributions of selected sources towards σ Orionis
Aims. We investigated in detail nine sources in the direction of the young σ Orionis cluster, which is considered a unique site for studying stellar and substellar formation. The nine sources were selected because of some peculiar properties, such as extremely red infrared colours or too strong Hα emission for their blue optical colours. Methods. We took high-quality, low-resolution spectroscop...
متن کاملCN/CN isotope ratio and fractionation
We have detected circumstellar absorption lines of the CN and CN Violet and Red System in the spectrum of the post-AGB star HD 56126. From a synthetic spectrum analysis, we derive a Doppler broadening parameter of b = 0.51 ± 0.04 km s, CN/CN= 38±2, and a lower limit of 2000 on CN/CN and CN/CN. A simple chemical model has been computed of the circumstellar shell surrounding HD 56126 that takes i...
متن کاملMutually Independent Hamiltonian Cycles of Cn x Cn
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1987
ISSN: 0252-9211
DOI: 10.1017/s0252921100105299