Results 11 to 20 of about 1,260 (183)
A survey of ultraviolet interstellar absorption lines
The Astrophysical Journal Supplement Series, 1983 A telescope-spectrometer on the Copernicus spacecraft made possible the measurement of many ultraviolet absorption lines produced by the interstellar gas. The present survey provides data on ultraviolet absorption lines in the spectra of 88 early-type stars.
R. C. Bohlin +6 more
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Interstellar Matter Structure along the Line of Sight to Cyg X-1
Open Astronomy, 2015 High-resolution spectra (R = 60 000) of Cyg X-1 = V1357 Cyg obtained with the NES echelle spectrograph of the Russian 6 meter telescope (3950–6690 Å) were used to study narrow interstellar absorption lines.
Bochkarev N. G. +3 more
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New and Improved Lyα Reconstructions for M and K Dwarfs
The Astrophysical Journal, 2023 The Ly α emission line is the brightest UV emission line in M and K dwarf spectra and serves as an important tool for studies of stellar chromospheres, the interstellar medium, and exoplanet atmospheres.
Angeli Sandoval +3 more
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The interstellar medium of the Magellanic Clouds from absorption lines [PDF]
Symposium - International Astronomical Union, 1991 General aspects of ISM studies using absorption line studies are given and available data are reviewed. Topics are: galactic foreground gas, individual fields in the Magellanic Clouds (MCs) and MC coronae. Overall investigations are discussed. It is demonstrated that the metals in the gas of the Large Magellanic Cloud (LMC) and Small Magellanic Cloud ...
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Interstellar absorption lines toward Cep OB4 [PDF]
Astronomy & Astrophysics, 2004 An analysis of optical echelle spectra towards nine stars in the Cep OB4 association is presented. Interstellar absorption lines which arise in the (1, 0) and (2,0) bands of the CN A 2 Π - X 2 Σ + red system towards BD+66° 1661, BD+66° 1674, and BD+66° 1675 are used to infer accurate CN column densities N(CN).
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The Astrophysical Journal, 2023 Molecules and particles make up ∼40%–70% of carbon in the interstellar medium, yet the exact chemical structure of these constituents remains unknown. We present carbon K-shell absorption spectroscopy of the Galactic interstellar medium obtained with the
John Staunton, Frits Paerels
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Narrow absorption lines from intervening material in supernovae
Astronomy & AstrophysicsNarrow interstellar absorption features in supernova (SN) spectra serve as valuable diagnostics for probing dust extinction and the presence of circumstellar or interstellar material.
Gutiérrez Claudia P. +3 more
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Interstellar absorption lines in the spectrum of Gamma Velorum
The Astrophysical Journal, 1979 Copernicus scans of selected interstellar absorption lines in the UV spectrum of Gamma Vel are analyzed, together with ground-based data, to obtain column densities for various ion states of C, N, O, Na, Mg, Al, Si, P, S, Cl, Ar, Ca, Mn, Fe, and CO. N I and O I are fitted to a single empirical curve of growth with a velocity parameter (b) of 8 km/s; Mg
D. C. Morton, S. P. Bhavsar
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The Astrophysical Journal Letters, 2023 Direct observations of low-mass, low-metallicity galaxies at z ≳ 4 provide an indispensable opportunity for detailed inspection of the ionization radiation, gas flow, and metal enrichment in sources similar to those that reionized the universe. Combining
Xiaojing Lin +21 more
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Interstellar absorption lines toward gamma Arae
The Astrophysical Journal, 1975 The available data on interstellar absorption lines in the spectrum of gamma Ara observed from the ground and with the Copernicus telescope have been analyzed to give column densities of various ion stages of H, C, N, O, Na, Mg, Si, P, S, Ar, Ca, Mn, and Fe.
D. C. Morton, E. M. Hu
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