Results 61 to 70 of about 2,805 (218)

On the Interstellar Extinction Curve toward HD 93222, a Sight Line with an Exceedingly Narrow 2175 Å Extinction Bump

The Astrophysical Journal
The 2175 Å extinction bump, the most prominent spectral feature superimposed on the interstellar extinction curve, is widely seen in the interstellar medium of the Milky Way and external galaxies, both near and far.
Qian Wang, Aigen Li, X. J. Yang
doaj   +1 more source

Ultraviolet Passbands for a Space Multicolor Photometric System

Open Astronomy, 2003
The results of search for the optimal location of ultraviolet passbands for an extra-atmospheric photometric system are given. The addition of passbands near the well-known extinction bump at 218 nm to the photometric system makes it possible to ...
Ambartsoumian A. R., Mironov A. V., Zakharov A. I.   +2 more
doaj   +1 more source

A Unified Model of Interstellar Extinction and Polarization. I [PDF]

The Astrophysical Journal, 1965
The Most Completely Observed Characteristics of Interstellar Grains are their ability to dim and polarize the light of distant stars in our own galaxy. The principal limitation in previous theoretical models of interstellar dust clouds has been the fact that the extinction and polarization have been calculated for different particles, the connection ...
J. Mayo Greenberg, G. Shah
openaire   +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

X-ray extinction from interstellar dust [PDF]

, 2019
Aims. We present a study on the prospects of observing carbon, sulfur, and other lower abundance elements (namely Al, Ca, Ti, and Ni) present in the interstellar medium using future X-ray instruments.
D. Rogantini, Tielens, A.G.G.M., C. P. de Vries, Rogantini, D., L. B. F. M. Waters, S. T. Zeegers, A. G. G. M. Tielens, Costantini, E., Waters, L.B.F.M., Zeegers, S.T., Vries, C.P. de, E. Costantini   +11 more
core   +2 more sources

The Multiwavelength Extinction Law and Its Variation in the Coalsack Molecular Cloud Based on the Gaia, APASS, SMSS, 2MASS, GLIMPSE, and WISE Surveys

The Astrophysical Journal
Accurate interpretation of observations relies on the interstellar dust extinction law, which also serves as a powerful diagnostic for probing dust properties.
Juan Deng, Shu Wang, Biwei Jiang, He Zhao   +3 more
doaj   +1 more source

On the Origin of the North Celestial Pole Loop

The Astrophysical Journal, 2023
The North Celestial Pole Loop (NCPL) provides a unique laboratory for studying the early-stage precursors of star formation. Uncovering its origin is key to understanding the dynamical mechanisms that control the evolution of its contents. In this study,
Antoine Marchal, Peter G. Martin
doaj   +1 more source

Climate Emergency and Different Ways to Fail? The Fermi Paradox, the Simulation Hypothesis, Agency and Hope

Journal for the Theory of Social Behaviour, Volume 55, Issue 4, December 2025.
ABSTRACT Humanity seems stuck on different ways to fail to meet the challenge posed by a declared climate emergency and manifest problems of ecological breakdown. Rather than reprise these failures, we use the Fermi Paradox and simulation hypothesis to make a simple point about agency. The argument unfolds in two sections.
Jamie Morgan
wiley   +1 more source

Extinction Distributions in Nearby Star-resolved Galaxies. II. M33

The Astronomical Journal
Extinction maps are essential for tracing interstellar dust and enabling accurate stellar population studies in galaxies. Here, a high-resolution extinction distribution of the nearby Triangulum galaxy (M33), is constructed by fitting multiband color ...
Yuxi Wang, Yi Ren, Jian Gao, Bingqiu Chen, Ying Li   +4 more
doaj   +1 more source

Interstellar Extinction of Planetary Nebulae [PDF]

Symposium - International Astronomical Union, 1993
We have compared the extinction of planetary nebulae (PN) as derived from the Balmer decrement and from the ratio of radio to Hβ fluxes.
G. Stasinska, R. Tylenda, A. Acker, B. Stenholm   +3 more
openaire   +1 more source