Results 1 to 10 of about 49,075 (253)

The Diffuse Interstellar Clouds toward 23 Orionis [PDF]

The Astrophysical Journal Supplement Series, 1999
Spectra obtained with the Hubble Space Telescope GHRS are combined with high-resolution optical spectra and UV spectra from Copernicus to study the abundances and physical conditions in the diffuse interstellar clouds seen along the line of sight to the star 23 Ori.
Welty, D. E., Hobbs, L. M., Lauroesch, J. T., Morton, D. C., Spitzer, L., York, D. G.   +5 more
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EXCITATION OF C₂IN DIFFUSE INTERSTELLAR CLOUDS

The Astrophysical Journal, 2012
We investigate the effects and the implications of incorporating new collision and radiative rates in modeling the excitation of diatomic carbon molecule. The present results suggest that diffuse and translucent interstellar clouds may present a structure in which regions with different densities and kinetic temperatures overlap along the line of sight,
S. Casu, Cesare Cecchi-Pestellini
openaire   +3 more sources

Pathway to the identification of C60+ in diffuse interstellar clouds. [PDF]

Philos Trans A Math Phys Eng Sci, 2016
Maier JP, Campbell EK.
europepmc   +2 more sources

Large molecules in diffuse interstellar clouds

The Astrophysical Journal, 1988
The effects of the presence of a substantial component of large molecules on the chemistry of diffuse molecular clouds are explored, and detailed models of the zeta Persei and zeta Ophiuchi clouds are constructed. The major consequence is a reduction in the abundances of singly charged atomic species.
Lepp, S., Dalgarno, A., Dishoeck, E.F. van, Black, J.H.   +3 more
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THE ABUNDANCE OF BORON IN DIFFUSE INTERSTELLAR CLOUDS [PDF]

The Astrophysical Journal, 2011
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 Telescope. Our sample of 56 Galactic sight lines is the result of a complete search of archival STIS data for the B II 1362 resonance line, with each detection confirmed by ...
Ritchey, A. M., Federman, S. R., Sheffer, Y., Lambert, David L.   +3 more
openaire   +5 more sources

Detection of C₃in Diffuse Interstellar Clouds [PDF]

The Astrophysical Journal, 2001
The smallest polyatomic carbon chain, C$_{3}$, has been identified in interstellar clouds (A$_{v}\sim$1 mag) towards $ $ Ophiuchi, 20 Aquilae, and $ $ Persei by detection of the origin band in its $A^{1} _{u}-X^{1} ^{+}_{g}$ electronic transition, near 4052 .
Maier, J. P., Lakin, N. M., Walker, G. A. H., Bohlender, D. A.   +3 more
openaire   +4 more sources

The CS molecule in diffuse interstellar clouds

The Astrophysical Journal, 1989
The CS J = 2-1 emission line at 98 GHz has been searched for in 10 diffuse molecular clouds. CS column densities are derived by performing statistical equilibrium calculations for the rotational population distribution which includes collisional excitation by electrons as well as by neutral species.
Drdla, K., Knapp, G.R., Dishoeck, E.F. van   +2 more
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Diffuse interstellar clouds associated with dark clouds

The Astrophysical Journal, 1982
Measurements of CH emission at 9 cm toward the bright stars ..cap alpha.. Cam and kappa Cas and from dark clouds near the stars reveal an association between diffuse clouds and dark clouds. Here the term diffuse clouds refers to clouds seen in optical absorption; the term dark clouds refers to opaque regions on the Palomar Sky Survey observed through ...
S. R. Federman, R. F. Willson
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NaH and LiH in diffuse interstellar clouds

The Astrophysical Journal, 1978
It has been suggested that NaH may be detectable in diffuse interstellar clouds. We discuss the photodissociation process of NaH and calculate the rate of destruction by the interstellar radiation field. In the unshielded field, the mean lifetime is about 10 years. There appears to be no efficient gas-phase mechanism for the production of NaH. If it is
K. Kirby, A. Dalgarno
openaire   +2 more sources

Laboratory infrared spectra and fragmentation chemistry of sulfur allotropes [PDF]

Nature Communications
Sulfur is one of six life-essential elements, but its path from interstellar clouds to planets and their atmospheres is not well known. Astronomical observations in dense clouds have so far been able to trace only 1 percent of cosmic sulfur, in the form ...
Piero Ferrari, Giel Berden, Britta Redlich, Laurens B. F. M. Waters, Joost M. Bakker   +4 more
doaj   +2 more sources