G. Wiedemann

Tesat-Spacecom (Germany)

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Ferdinand Rostásy

Technische Universität Braunschweig

T. R. Ayres

Laboratory for Atmospheric and Space Physics

Donald E. Jennings

Goddard Space Flight Center

Hans-Günter Kusch

Fraunhofer Institute for Material and Beam Technology

D. E. Jennings

Goddard Space Flight Center

Drake Deming

University of Maryland, College Park

J. J. Keady

Los Alamos National Laboratory

Kenneth H. Hinkle

NSF’s NOIRLab

Thomas Heinze

Friedrich Schiller University Jena

Andreas Ringwald

Deutsches Elektronen-Synchrotron DESY

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Deutsches Elektronen-Synchrotron DESY

Goddard Space Flight Center

Planetary Systems (United States)

Max Planck Society

Fraunhofer Institute for Material and Beam Technology

Centre National de la Recherche Scientifique

Kitt Peak National Observatory

Johns Hopkins University Applied Physics Laboratory

Laboratoire de Recherche des Monuments Historiques

National Aeronautics and Space Administration

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$SiS, C_{2}H_{2}$, AND HCN IN $IRC+10216$: ASTRONOMY AT 12- 14 MICRONS WITH A POSTDISPERSED FTS

D. E. Jennings R. J. Boyle J. J. Keady G. Wiedemann

$^{1}$ G.R. Wiedemann, K. H. Hinkle, J. J. Keady. D. Deming. and D. E. Jennings 1990. Astrophys. J.,submitted. $^{2}$ G. R. Wiedemann, D. E. Jennings, R. A. Hanal. V. G. Kunde. S. H. Moseley. G. Lamb. M. D. Petroff. and M. G. Stapelbroek 1989, Applied Optics, 28,139.

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New ALPS results on hidden-sector lightweights

Physics Letters B (2010)

Klaus Ehret Maik Frede Samvel Ghazaryan M. Hildebrandt Ernst-Axel Knabbe

DESY

Hidden sector

10.1016/j.physletb.2010.04.066

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Citations (362)

Changes of pore structure of cement mortars due to temperature

Cement and Concrete Research (1980)

Ferdinand Rostásy R. Weiβ G. Wiedemann

10.1016/0008-8846(80)90072-1

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Citations (172)

Behaviour of mortar and concrete at extremely low temperatures

Cement and Concrete Research (1979)

Ferdinand Rostásy Ulrich Schneider G. Wiedemann

Hum

10.1016/0008-8846(79)90129-7

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Citations (80)

Non-LTE CO, revisited

The Astrophysical Journal (1989)

T. R. Ayres G. Wiedemann

view Abstract Citations (72) References (45) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Non--LTE CO Revisited Ayres, Thomas R. ; Wiedemann, Gunter R. Abstract A more extensive and detailed non-LTE simulation of the Delta v = 1 bands of CO than attempted previously is reported. The equations of statistical equilibrium are formulated for a model molecule containing 10 bound vibrational levels, each split into 121 rotational substates and connected by more than 1000 radiative transitions. Solutions are obtained for self-consistent populations and radiation fields by iterative application of the 'Lambda-operator' to an initial LTE distribution. The formalism is used to illustrate models of the sun and Arcturus. For the sun, negligible departures from LTE are found in either a theoretical radiative-equilibrium photosphere with outwardly falling temperatures in its highest layers or in a semiempirical hot chromosphere that reproduces the spatially averaged emission cores of Ca II H and K. The simulations demonstrate that the puzzling 'cool cores' of the CO Delta V = 1 bands observed in limb spectra of the sun and in flux spectra of Arcturus cannot be explained simply by non-LTE scattering effects. Publication: The Astrophysical Journal Pub Date: March 1989 DOI: 10.1086/167256 Bibcode: 1989ApJ...338.1033A Keywords: Carbon Monoxide; Infrared Spectra; Late Stars; Thermodynamic Equilibrium; Vibrational Spectra; Line Spectra; Radiative Transfer; Stellar Temperature; Astrophysics; INFRARED: SPECTRA; LINE FORMATION; MOLECULAR PROCESSES; RADIATIVE TRANSFER; STARS: ABUNDANCES; STARS: LATE-TYPE full text sources ADS | data products SIMBAD (1)

Photosphere

10.1086/167256

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Citations (71)

Observations and Analysis of Longitudinal Thermal Waves on Jupiter

Icarus (1997)

Drake Deming Dennis C. Reuter Donald E. Jennings G. L. Bjoraker G. H. McCabe

Wavenumber

Longitude

Jupiter (rocket family)

Atmospheric wave

Phase velocity

Kelvin wave

10.1006/icar.1996.5658

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Citations (32)

A review of health hazards linked to the use of lasers for stone cleaning

Journal of Cultural Heritage (2003)

Véronique Vergès‐Belmin G. Wiedemann Lothar W. Weber Martin Cooper Derrick Crump

10.1016/s1296-2074(02)01224-4

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Citations (12)

Laser cleaning applied in the restoration of a medieval wooden panel chamber at Pirna

Journal of Cultural Heritage (2000)

G. Wiedemann Markus S. Schulz Jan Hauptmann Hans-Günter Kusch Sabine Müller

Dirt

Collar

10.1016/s1296-2074(00)00133-3

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Citations (16)

FTS Observation of CO Fundamental Bands in Cool Stellar Atmospheres

G. Wiedemann T. R. Ayres Donald E. Jennings

The infrared ro-vibration spectrum of carbon monoxide provides a powerful observational diagnostic for the investigation of late-type stellar atmospheres. At temperatures of several thousands of degrees, CO vibrational states up to v=7 and rotational states up to j≈100 are populated. The corresponding lines are formed over, and therefore probe, a large range in altitude. The strongest fundamental lines (Δv=1) originate in the upper photosphere and in the chromosphere, regions which are only inadequately described by present stellar atmosphere theories. Numerical simulations have shown that CO affects the stellar atmospheric structure through cooling in optically thin lines (e.g. Johnson, 1973). CO observations are important, because the model predictions can be tested reliably only from observations of species that are intimately involved. This is particularly true in view of the dilemma posed by the contradicting results of 'conventional' chromospheric diagnostics and first CO Δv=1 observations on the Sun (Ayres and Testerman, 1981) and Arcturus (Heasley et al., 1978). The present study has been conducted to establish CO fundamental bands as an observational diagnostic for the higher layers of cool stellar atmospheres.

Chromosphere

Photosphere

Atmospheric models

10.1364/hrfts.1989.mb4

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Assessment of laser cleaning rate on limestones and sandstones

Journal of Cultural Heritage (2000)

Martin Labouré Philippe Bromblet Geneviève Orial G. Wiedemann Christophe Simon-Boisson

Dirt

10.1016/s1296-2074(00)00195-3

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Citations (30)