Results 61 to 70 of about 57,383 (218)

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

Sloan Digital Sky Survey IV MaStar: Quantification and Abatement of Interstellar Absorption in the Largest Empirical Stellar Spectral Library

The Astrophysical Journal
We assess the impact of Ca ii λ λ 3934, 3969 and Na i λ λ 5891, 5897 absorption arising in the interstellar medium (ISM) on the Sloan Digital Sky Survey-IV MaNGA Stellar Library (MaStar) and produce corrected spectroscopy for 80% of the 24,162-star ...
Kate H. R. Rubin, Kyle B. Westfall, Claudia Maraston, Daniel Thomas, Renbin Yan, J. Christopher Howk, Erick Aguirre, Kaelee S. Parker, David R. Law   +8 more
doaj   +1 more source

Optical interstellar absorption lines toward 29 stars

The Astrophysical Journal Supplement Series, 1984
Observations of optical interstellar absorption lines of Ti II, Ca II, and/or Na I acquired at an instrumental resolution typically of 5.6 km/s are reported for 29 stars. The data were recorded primarily with a Digicon detector and achieve 2 sigma detection limits generally near an equivalent width of 1 mA.
openaire   +1 more source

Interstellar absorption lines in the spectrum of Gamma Velorum

The Astrophysical Journal, 1979
Copernicus scans of selected interstellar absorption lines in the UV spectrum of Gamma Vel are analyzed, together with ground-based data, to obtain column densities for various ion states of C, N, O, Na, Mg, Al, Si, P, S, Cl, Ar, Ca, Mn, Fe, and CO. N I and O I are fitted to a single empirical curve of growth with a velocity parameter (b) of 8 km/s; Mg
D. C. Morton, S. P. Bhavsar
openaire   +1 more source

Characterizing the Signals and Backgrounds in a Low Earth Orbiting Cherenkov Detector, and Background Mitigation Strategies

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract Cherenkov detectors have been used in space for decades to measure Galactic Cosmic Rays (GCRs), Solar Energetic Particles (SEPs) and trapped particles. We present proof‐of‐concept GRAS/Geant4 simulations to both show that a cubic fused silica Cherenkov detector with SiPM in LEO has a good sensitivity to SEP and GCR protons as a function of cut‐
C. S. W. Davis, F. Lei, K. Ryden, C. Dyer, G. Santin, P. Jiggens, M. Heil   +6 more
wiley   +1 more source

The spectroscopic evolution of the recurrent nova T Pyxidis during its 2011 outburst I. The optically thick phase and the origin of moving lines in novae

, 2011
The nova T Pyx was observed with high resolution spectroscopy (R ~ 65000) spectroscopy, beginning 1 day after discovery of the outburst and continuing through the last visibility of the star at the end of May 2011. The interstellar absorption lines of Na
A. Ederoclite, Brand, Friedman, H. Uthas, Kalberla, Kato, McLaughlin, McLaughlin, Moore, S. N. Shore, Sadakane, Schaefer, Schlegel, Schwarz, Selvelli, Starrfield, T. Augusteijn, Uthas, Williams, Williams   +19 more
core   +1 more source

The Constraint of Crewed Mars Missions Based on Current Radiation Dose Measurements

Space Weather, Volume 24, Issue 3, March 2026.
Abstract Crewed missions to Mars will be a milestone of future space exploration programs. However, the absence of Earth's magnetic field leaves astronauts directly exposed to unattenuated energetic particles in deep space, primarily galactic cosmic rays (GCRs), resulting in significantly higher radiation levels and enhanced health risks. Understanding
Chao Zhang, Weihao Liu, Jingnan Guo, Mikhail Dobynde, Robert F. Wimmer‐Schweingruber   +4 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

Molecules in the transition disk orbiting T Cha

, 2013
We seek to establish the presence and properties of gas in the circumstellar disk orbiting T Cha, a nearby (d~110 pc), relatively evolved (age ~5-7 Myr) yet actively accreting 1.5 Msun T Tauri star.
Forveille, T., Hily-Blant, P., Kastner, J. H., Montez Jr., R., Principe, D., Sacco, G. G., Zuckerman, B.   +6 more
core   +1 more source

A Study of Interstellar Gas and Stars in the Gravitationally Lensed Galaxy `The Cosmic Eye' from Rest-Frame Ultraviolet Spectroscopy [PDF]

, 2009
We report the results of a study of the rest-frame UV spectrum of the Cosmic Eye, a luminous Lyman break galaxy at z=3.07331 gravitationally lensed by a factor of 25.
Alice E. Shapley, Anna M. Quider, Belokurov, Belokurov, Cabanac, Calzetti, Chabrier, Charles C. Steidel, Coppin, Crowther, Daniel P. Stark, Dye, Dye, Erb, Erb, Erb, Estrada, Finkelstein, Förster Schreiber, Hainline, Halliday, Jenkins, Jenkins, Kennicutt, Kewley, Kornei, Kubo, Kudritzki, Law, Law, Leitherer, Leitherer, Lemoine-Busserolle, Lin, Maiolino, Martin, Martin, Max Pettini, Meurer, Morton, Noterdaeme, Ofek, Pagel, Pettini, Pettini, Pettini, Pettini, Pettini, Pettini, Pontzen, Quider, Reddy, Reddy, Reddy, Rix, Rupke, Salpeter, Seitz, Shapley, Shapley, Sheinis, Shin, Siana, Siana, Smail, Stark, Steidel, Steidel, Steidel, Swinbank, Swinbank, Teplitz, Vanzella, Weiner, Wen, Yuan   +75 more
core   +2 more sources