Results 21 to 30 of about 1,537 (221)

Microlensing of circumstellar envelopes: II. emission lines from radial and azimuthal flow during fold caustic crossings [PDF]

, 2003
This paper examines the line profile evolution due to bulk motion in circumstellar envelopes during microlensing fold caustic crossing events. These events have recently been shown to be a sensitive probe of stellar surface brightness profiles, thus ...
Bryce, H.M., Hendry, M.A., Ignace, R., H. M. Bryce, M. A. Hendry, R. Ignace   +5 more
core   +1 more source

Insights Into the Gas-Phase Structure and Internal Dynamics of Diphenylsilane: A Broadband Rotational Spectroscopy Study. [PDF]

Chemphyschem
The structure of diphenylsilane could be determined from the rotational spectra of all its singly substituted heavy atom isotopologues. A comparison with its oxygen analogue diphenylether revealed some interesting differences in the internal dynamics as well as in the gas‐phase structure.
Batra G, Schnell M.
europepmc   +2 more sources

Theory of circumstellar envelopes [PDF]

Symposium - International Astronomical Union, 1987
After a comparison of conventional photospheres with circumstellar envelopes the radiation in spherical shells is considered. We discuss the transfer equation and a new quasi-exact solution in term of the transition matrix-Various methods used for the numerical evaluation of the specific intensities are summarized.
openaire   +1 more source

Vibrational Predissociation Spectra of C2N− and C3N−: Bending and Stretching Vibrations

ChemPhysChem, Volume 24, Issue 15, August 1, 2023., 2023
Infrared predissociation spectra of C2N−(H2) and C3N−(H2) is reported using a cryogenic ion trap at the FELIX Laboratory, thus allowing the detection of low‐lying bending and stretching vibrations of both anions simultaneously. Vibrational configuration interaction calculations validate the assignment.
Franziska Dahlmann, Dennis F. Dinu, Pavol Jusko, Christine Lochmann, Thomas Gstir, Aravindh N. Marimuthu, Klaus R. Liedl, Sandra Brünken, Roland Wester   +8 more
wiley   +1 more source

Microlensing of circumstellar envelopes III. Line profiles from stellar winds in homologous expansion [PDF]

, 2006
This paper examines line profile evolution due to the linear expansion of circumstellar material obsverved during a microlensing event. This work extends our previous papers on emission line profile evolution from radial and azimuthal flow during point ...
Bryce, H.M., Hendry, M., Hendry, M.A., Bryce, H., Ignace, R., H. M. Bryce, Ignace, Richard, M. A. Hendry, R. Ignace   +8 more
core   +1 more source

Unveiling the Circumstellar Envelope and Disk: A Subarcsecond Survey of Circumstellar Structures [PDF]

The Astrophysical Journal, 2000
47 Pages, 18 Figures, ApJ ...
Looney, Leslie W., Mundy, Lee G., Welch, W. J.   +2 more
openaire   +2 more sources

First Observations With a GNSS Antenna to Radio Telescope Interferometer

Radio Science, Volume 58, Issue 8, August 2023., 2023
Abstract We describe the design of a radio interferometer composed of a Global Navigation Satellite Systems (GNSS) antenna and a Very Long Baseline Interferometry radio telescope. Our eventual goal is to use this interferometer for geodetic applications including local tie measurements.
J. Skeens, J. York, L. Petrov, D. Munton, K. Herrity, R. Ji‐Cathriner, S. Bettadpur, T. Gaussiran   +7 more
wiley   +1 more source

Infrared Spectral Fingerprint of Neutral and Charged Endo- and Exohedral Metallofullerenes

The Astrophysical Journal Supplement Series, 2023
Small metal-containing molecules have been detected and recognized as one of the hybrid species that are efficiently formed in space, especially in the circumstellar envelopes of evolved stars.
R. Barzaga, D. A. García-Hernández, S. Díaz-Tendero, SeyedAbdolreza Sadjadi, A. Manchado, M. Alcami, M. A. Gómez-Muñoz, T. Huertas-Roldán   +7 more
doaj   +1 more source

Circumstellar envelope of the supergiant 89 Herculis [PDF]

Symposium - International Astronomical Union, 1987
A bright enigmatic supergiant, 89 Her (HD 163506; F2Ia, Mbol=-7m.5), exhibits the light variations (Percy et al. 1979, Fernie 1981, 1983) as well as the changes of radial velocities and structures of Balmer and sodium lines. Sargent and Osmer (1969) have given some evidences for the existence of expanding circumstellar envelope around 89 Her and have ...
J. L. Climenhaga, J. Smoliński, J. Krempeć-Krygier, B. Krygier, S. Krawczyk   +4 more
openaire   +1 more source

The harsh environment where exoplanets live

Astronomische Nachrichten, Volume 343, Issue 4, May 2022., 2022
Abstract The X‐ray and Extreme Ultraviolet (XUV) actvity of the Sun has determined important effects on the planets around it. In particular, high doses of X‐rays, flares, and coronal mass ejections (CMEs) combined with masses and sizes of the planets and the shielding action of the planetary magnetic fields have determined the diverse habitability of ...
Ignazio Pillitteri
wiley   +1 more source