Results 61 to 70 of about 2,644 (226)

High-Resolution Optical Observations of Interstellar Absorption Lines [PDF]

Highlights of Astronomy, 2005
AbstractWe briefly note several current topics concerning the properties of interstellar clouds for which high-resolution optical spectra play a significant role: (1) the recognition and characterization of small-scale (sub-pc) structure in both atomic and molecular gas; (2) the discovery of variations in the 7Li/6Li isotopic ratio in the nearby ...
openaire   +1 more source

The Nature of Interstellar Gas toward the Pleiades Revealed in Absorption Lines [PDF]

The Astrophysical Journal, 2006
We present high-resolution, high signal to noise absorption-line observations of CN, Ca II, Ca I, CH^+, and CH along twenty lines of sight toward members of the Pleiades. The acquired data enable the most detailed study to date of the interaction between cluster stars and the surrounding interstellar gas.
Ritchey, A. M., Martinez, M., Pan, K., Federman, S. R., Lambert, D. L.   +4 more
openaire   +2 more sources

Influence of Mars Topography on Radiation Dose Detected by the Mars Science Laboratory and Assessment of Mars Surface Albedo Radiation

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract The Radiation Assessment Detector (RAD) on the Curiosity rover has been characterizing the Martian surface radiation field since 2012. The dose observed by RAD is influenced by a variety of factors, including an essential one, the terrain. After parking near Murray Buttes in September 2016 where it first detected a ∼5% decrease in dose rate ...
Jingnan Guo, Changqi Tian, Gabin Charpentier, Robert F. Wimmer‐Schweingruber, Salman Khaksarighiri, Lu Pan, Jan Leo Löwe, Bent Ehresmann, Donald M. Hassler, Cary Zeitlin, Daniel Matthiä, Thomas Berger, Günther Reitz   +12 more
wiley   +1 more source

Equivalent Width of the Interstellar Na i D1 and D2 Absorption Lines for Stars with E(B−V) < 0.15

New measurements of the equivalent width of the interstellar Na i D1 and D2 absorption lines for 62 bright B-type stars with E(B − V) < 0.15 are used to recalibrate the relation between these quantities in this low-reddening regime, and to quantify the ...
Maxted, Pierre F. L.
core   +1 more source

Absorption and scattering by interstellar dust in the silicon K-edge of GX 5-1

, 2017
We study the absorption and scattering of X-ray radiation by interstellar dust particles, which allows us to access the physical and chemical properties of dust.
Zeegers, S. T., Tielens, A.G.G.M., de Vries, C.P., S. T. Zeegers, A. G. G. M. Tielens, Costantini, E., Chihara, H., Waters, L.B.F.M., S. Zeidler, Vries, C.P., F. de Groot, Mutschke, H., Groot, F., Sub Inorganic Chemistry and Catalysis, Inorganic Chemistry and Catalysis, Tielens, A. G. G. M., C. P. de Vries, L. B. F. M. Waters, H. Chihara, Groot, F. de, H. Mutschke, Zeegers, S.T., E. Costantini, Zeidler, S.   +23 more
core   +1 more source

Aperture Synthesis of Interstellar Neutral Hydrogen in Absorption [PDF]

, 1973
NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The Owens Valley Radio Observatory interferometer has been used to carry out a program of aperture synthesis in the interstellar neutral
Greisen, Eric Winslow
core   +1 more source

Revisiting the Ultraviolet Spectroscopy of the η Tel Edge-on Debris Disk

The Astronomical Journal
We revisit the ultraviolet absorption spectroscopy of the edge-on debris disk surrounding the A0V star η  Telescopii. Previous work found absorption components at four velocities (∼−23, −18, −10, −1 km s ^−1 ), with the most blueshifted component (−23 km
Allison Youngblood, Alexis Brandeker, Sebastián Pérez, Aki Roberge, Alycia Weinberger, Meredith A. MacGregor, Barry Welsh   +6 more
doaj   +1 more source

Observations of variability in interstellar absorption lines [PDF]

, 2018
Nedavna otkrića varijabilnosti inteziteta međuzvjezdanih spektralnih linija ukazuju na moguće postojanje brzih i vrlo malih struktura materije u međuzvjezdanom mediju, reda veličine od 10 do 100 astronomskih jedinica (AU).
Vješnica, Stella
core  

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

The density distribution and 58.4 nm radiation intensity of interstellar helium in the heliosphere: a model simulation

Earth and Planetary Physics
Research on the interstellar medium and its interaction with the solar system constitutes a significant topic in planetary physics. As the Sun traverses the local interstellar cloud, interstellar neutrals penetrate the heliosphere, forming the ...
JiaLing Lyu, ChongJing Yuan, Fei He, BeiLi Ying   +3 more
doaj   +1 more source