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751 results on '"Auer L"'

1. Toulouse 2D numerical radiative transfer codes

Author

Paletou, F., Léger, L., Chane-Yook, M., and Auer, L. H.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

A tutorial associated with the distribution of 2D non-LTE multilevel atom radiative transfer codes., Comment: Tutorial (5 p.); see also https://idoc.ias.u-psud.fr/MEDOC/Radiative%20transfer%20codes/MALI-GS-2D

Published
2019

20. Asronomical refraction: Computational methods for all zenith angles

Author

Auer, L. H and Standish, E. M

Subjects
Astrophysics
Abstract

It is shown that the problem of computing astronomical refraction for any value of the zenith angle may be reduced to a simple, nonsingular, numerical quadrature when the proper choice is made for the independent variable of integration.

Published
2000

22. Videotechnische Messung der Blutströmungsgeschwindigkeit in Pialen Gefässen des Säugetiergehirns

Author

Pucher, R., Auer, L. M., Schuy, S., Hoffmann, G., Holzmann, D., Jäger, F., Riedling, K., Schwuttke, G. H., Pandelisev, K. A., White, R. C., Holzmann, H., Kausel, W., Nanz, G., Selberherr, S., Pötzl, H., Leopold, H., Röhrer, R., Winkler, G., Thurner, M., Seiner, K., Tritremmel, W., Walther, G., Schoitsch, Erwin, Hertl, S., Schaffar, G., Schmidt, K., Steinbrecher, H., Voggenberger, F., Windischhofer, W., Turba, R., Grabner, J., Aberl, H., Seifert, F., Buschbeck, F., Wallisch, K., Eichtinger, Ch., Wach, P., Bittinger, W., Kainz, A., Jestl, M., Beinstingl, W., Berthold, K., Köck, A., Gornik, E., Kloiber, G., Kreid, F., Schröcker, K. P., Schrödl, M., Brazda, E., Niedrist, G., Dietz, K., Fey, P., Frenkenberger, S., Furtner, M., Dejneka, B., Goiser, A., Sust, M., Kowatsch, M., Jorde, Ch., Thallinger, G. G., Mothwurf, E., Schubert, E., Steger, J., Trzeba, E., Awramow, I., Pucher, R., Auer, L. M., Schuy, S., Schima, H., Huber, L., Prodinger, A., Schmallegger, H., Thoma, H., Stöhr, H., Mayr, W., Steiner, R., Wiedenbauer, O., List, G., Wießpeiner, G., Petsch, Th., Doblhoff, G., Kirchner, D., Koudelka, O., Gierlinger, A., Ullrich, A., Braune, B., Horvat, H., Mayer, U., Gauby, A., Richter, A., Spiess, K. R., Klösch, W., Böck, N., Rosenkranz, H., Mitter, H., Hengl, M., Nussbaum, G., Gutternigh, K., Hahn, H., Koutny, P., Pühringer, K., Schwabach, H., Hirschler, M., Haas, M., Renner, A., Bratengeyer, E., Scholz-Nauendorff, C. C., Lebutsch, K., Volkmann, W., Gerner, H., Girsch, W., Holle, J., Kluger, P., Meister, B., Moritz, E., Schwanda, G., Prager, L., Wieβpeiner, G., Grübler, R., Dorfer, E., Oitzl, E., Pribyl, W., Bähring, M., Harter, J., and Sommer, D.

Published
1987
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23. Line profiles variations from atmospheric eclipses: Constraints on the wind structure in Wolf-Rayet stars

Author

Auer, L. H and Koenigsberger, G

Subjects
Astronomy
Abstract

Binary systems in which one of the components has a stellar wind may present a phenomenon known as 'wind' or 'atmospheric eclipse', in which that wind occults the luminous disk of the companion. The enhanced absorption profile, relative to the spectrum at uneclipsed orbital phases, can be be modeled to yield constraints on the spatial structure of the eclipsing wind. A new, very efficient approach to the radiative transfer problem, which makes no requirements with respect to monotonicity of the velocity gradient or size of that gradient, is presented. The technique recovers both the comoving frame calculation and the Sobolev approximation in the appropiate limits. Sample computer simulations of the line profile variations induced by wind eclipses are presented. It is shown that the location of the wind absorption features in frequency is a diagnostic tool for identifying the size of the wind acceleration region. Comparison of the model profile variations with the observed variations in the Wolf-Rayet (W-R)+6 binary system V444 Cyg illustrate how the method can be used to derive information on the structure of the wind of the W-R star constrain the size of the W-R core radius.

Published
1994
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24. Remarkable long-term changes in the small Magellanic Cloud Wolf-Rayet system HD 5980

Author

Koenigsberger, G, Moffat, A. F. J, St-Louis, N, Auer, L. H, Drissen, L, and Seggewiss, W

Subjects
Astronomy
Abstract

In this paper we report the remarkable changes which occured in the Small Magellanic Cloud W-R system HD5980 = AB5 between 1978 and 1991. Within this timescale, there has been a systematic enhancement (by factors of 2-10 depending on the line) in the equivalent widths of all emission lines, and a change in the relative strengths of N III, N IV, and N V lines. Currently, the W-R spectrum is more typical of a WN6 star than a WN3 or WN4, as it was originally classified. The terminal speed of the wind has diminished by approximately 600 km/s, while the system has brightened in the visual by 0.45 mag. The UV (1850 A) continuum changed by less than 0.13 mag. The change from WN3 or WN4 to WN6 is unprecedented. The system appears to be composed at least three stars: two WNs in mutual 19.266 day orbit and an O-type supergiant. We propose that the changes observed in HD 5980 are related to an increase in wind density of one (or both?) of the W-R components, where the brighter WN6 component will dominate the W-R spectrum after the change, and we speculate that this modification of the wind structure is driven by tidal interaction induced by a possible current periastron passage of the third component in the system.

Published
1994
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25. Mantle dynamics in the Mediterranean

Author

Faccenna C. Becker T. W. Auer L. Billi A. Boschi L. Brun J.-P. Capitanio F. A. Funicie

Abstract

The Mediterranean offers a unique opportunity to study the driving forces of tectonic deformation within a complex mobile belt. Lithospheric dynamics are affected by slab rollback and collision of two large slowly moving plates forcing fragments of continental and oceanic lithosphere to interact. This paper reviews the rich and growing set of constraints from geological reconstructions geodetic data and crustal and upper mantle heterogeneity imaged by structural seismology. We proceed to discuss a conceptual and quantitative framework for the causes of surface deformation. Exploring existing and newly developed tectonic and numerical geodynamic models we illustrate the role of mantle convection on surface geology. A coherent picture emerges which can be outlined by two almost symmetric upper mantle convection cells. The downwellings are found in the center of the Mediterranean and are associated with the descent of the Tyrrhenian and the Hellenic slabs. During plate convergence these slabs migrated backward with respect to the Eurasian upper plate inducing a return flow of the asthenosphere from the back arc regions toward the subduction zones. This flow can be found at large distance from the subduction zones and is at present expressed in two upwellings beneath Anatolia and eastern Iberia. This convection system provides an explanation for the general pattern of seismic anisotropy in the Mediterranean first order Anatolia and Adria microplate kinematics and may contribute to the high elevation of scarcely deformed areas such as Anatolia and eastern Iberia. More generally the Mediterranean is an illustration of how upper mantle small scale convection leads to intraplate deformation and complex plate boundary reconfiguration at the westernmost terminus of the Tethyan collision.

Published
2014
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28. Ultrasound-Guided Neuroendoscopy

Author

Auer, L. M., Holzer, P., Ascher, P. W., Heppner, F., Walter, Wendelin, editor, Brandt, Mathias, editor, Klinger, Margareta, editor, and Brock, Mario, editor

Published
1988
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