Results 41 to 50 of about 9,625 (210)

A Far-Ultraviolet Spectroscopic Survey of Luminous Cool Stars

, 2004
FUSE ultraviolet spectra of 8 giant and supergiant stars reveal that high temperature (3 X 10^5 K) atmospheres are common in luminous cool stars and extend across the color-magnitude diagram from Alpha Car (F0 II) to the cool giant Alpha Tau (K5 III ...
A. K. Dupree, A. Lobel, Barnes T. G., Doyle J. G., Hartman H., Hunsch M., Hunsch M., Hunsch M., J. L. Linsky, Johnson H. L., Kaufman V., Marilli E., P. R. Young, Perryman M. A. C., Reimers D., Reimers D., Rutten R. G. M., S. Redfield, Schaller G., Strassmeier K. G., T. B. Ake, Teriaca L.   +21 more
core   +1 more source

Far-UV Observations of NGC 4151 during the ORFEUS-SPAS II Mission [PDF]

, 1997
We observed the Seyfert 1 galaxy NGC 4151 on eleven occasions at 1-2 day intervals using the Berkeley spectrometer during the ORFEUS-SPAS II mission in 1996 November.
A. F. Davidsen, B. R. Espey, Bromage G., G. A. Kriss, Hurwitz M., J. H. Krolik, Ulrich M. H., W. Zheng, Z. Tsvetanov   +8 more
core   +2 more sources

Observation of Mountain Waves and Secondary Gravity Waves in the Mesosphere Lower Thermosphere Above Patagonia

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 6, 28 March 2026.
Abstract We find observational evidence for mountain waves (MWs) and secondary gravity waves (2GWs) in the OH*(3‐1) layer above Tierra del Fuego, Argentina. On the night of 21–22 May 2018, the Advanced Mesospheric Temperature Mapper (AMTM) obtained temperatures at ∼84 ${\sim} 84$ km.
Robert Reichert, Pierre‐Dominique Pautet, Bernd Kaifler, Sebastian Rhode, Jörn Ungermann, Kaoru Sato, Diego Janches, Steven Smith   +7 more
wiley   +1 more source

GALEX FUV Observations of Comet C/2004 Q2 (Machholz): The Ionization Lifetime of Carbon

, 2010
We present a measurement of the lifetime of ground state atomic carbon, C(^3P), against ionization processes in interplanetary space and compare it to the lifetime expected from the dominant physical processes likely to occur in this medium.
Axford, Bockelée-Morvan, Bonev, Combi, Combi, Eberhardt, Feldman, Festou, Glinski, Harold A. Weaver, Harris, Haser, Hibbert, Jeffrey P. Morgenthaler, Kobayashi, Krishna-Swamy, Kupperman, Lupu, Markwardt, Martin, McPhate, Michael R. Combi, Morrissey, Morrissey, Moré, Paul D. Feldman, Sujatha, Tozzi, van Dishoeck, Walter M. Harris   +29 more
core   +1 more source

Final Calibration of the Berkeley Extreme and Far-Ultraviolet Spectrometer on the ORFEUS-SPAS I and II Missions [PDF]

, 2001
The Berkeley Extreme and Far-Ultraviolet Spectrometer (BEFS) flew as part of the ORFEUS telescope on the ORFEUS-SPAS I and II space-shuttle missions in 1993 and 1996, respectively.
Hurwitz M., Jean Dupuis, Mark Hurwitz, Marsh M. C., Napiwotzki R., Penston M. V., Vidal-Madjar A., W. Van Dyke Dixon   +7 more
core   +2 more sources

Resonant Vibrational Excitation and Overtone Vibrational Emissions of Nitric Oxide (NO) in Sub‐Auroral Ion Drift (SAID) Region: A Source of STEVE Continuum Emission

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract At elevated electron temperature (Te≥3000°K ${T}_{e}\mathit{\ge }3000\mathit{{}^{\circ}}\mathrm{K}$) inside Sub‐Auroral Ion Drift, resonant vibrational excitation (RVE) increases the vibrationally excited (v≥8 $v\mathit{\ge }8$) nitric oxide (NO) population in the E‐region, which undergoes overtone vibrational emissions (Δv≥8 ${\Delta }v ...
Andrew W. Yau, Andrew D. Howarth, William K. Peterson   +2 more
wiley   +1 more source

PALACE v1.0: Paranal Airglow Line And Continuum Emission model [PDF]

Geoscientific Model Development
Below about 2.3 µm, the nighttime emission of the Earth's atmosphere is dominated by non-thermal radiation. Excluding aurorae, the emission is caused by chemical reaction chains that are driven by the daytime photolysis and photoionisation of ...
S. Noll, S. Noll, S. Noll, C. Schmidt, P. Hannawald, W. Kausch, S. Kimeswenger, S. Kimeswenger   +7 more
doaj   +1 more source

A Survey of 10-Micron Silicate Emission from Dust around Young Sun-Like Stars [PDF]

, 2003
We obtained low resolution (R = 100) mid-infrared (8-13 micron wavelengths) spectra of 8 nearby young main sequence stars with the Keck 1 telescope and Long-Wavelength Spectrometer (LWS) to search for 10 micron silicate (Si-O stretch) emission from ...
Aumann, Backman, Christopher Koresko, Chyba, Ciardi, Eric Gaidos, Fajardo-Acosta, Fegley, Fernandez, Gaidos, Gaidos, Gaidos, Habing, Hanner, Hanner, Hayward, Jones, Jäger, Knacke, Koerner, Kuchner, Kurucz, Laureijs, Leinert, Levison, Melosh, Montes, Neugebauer, Perryman, Sitko, Skinner, Skrutskie, Strom, Waelkens, Wilner   +34 more
core   +1 more source

Discovery and Initial Investigation of a New Low Surface Brightness Planetary Nebula Candidate at High Galactic Latitude

Astronomische Nachrichten, Volume 347, Issue 3, March 2026.
ABSTRACT Planetary nebulae represent a late evolutionary phase of low‐ to intermediate‐mass stars. In this article, we present the serendipitous discovery of a previously unknown, faint potential Galactic planetary nebula (PN) in the constellation Camelopardalis, identified during a survey‐inspection, aiming at the detection of dwarf companions of the ...
W. E. Celnik, P. Köchling, S. Kotov, J. Kozok, Y. Galata, L. Magrini, A. Moiseev, M. Nischang, C. Reese, P. Remmel, P. Riepe, T. Zilch, K. Werner   +12 more
wiley   +1 more source

Seasonal and interannual variations in the [OI] 630 nm atmospheric emission as derived from observations over Eastern Siberia in 2011–2017

Solar-Terrestrial Physics, 2018
Seasonal and interannual variations in the [OI] 630 nm atmospheric emission are studied from observations of airglow in Eastern Siberia. Among features of seasonal variation in this emission are a pronounced summer maximum, an autumn minimum, and a ...
Mikhalev A.V.
doaj   +1 more source