Results 81 to 90 of about 30,446 (206)

Circumstellar dust [PDF]

The presence of dust in the general interstellar medium is inferred from the extinction, polarization, and scattering of starlight; the presence of dark nebulae; interstellar depletions; the observed infrared emission around certain stars and various ...
Dwek, E.
core   +1 more source

INTERSTELLAR EXTINCTION MODELLING BY AGGREGATE DUST

International Journal of Advanced Research
Extinction generally ours whenever electromagnetic radiation propagates through a medium containing small particles. The spectral dependence of extinction, or extinction curve, is a function of the composition, structure and size distribution of the particles.
openaire   +1 more source

An All-sky 3D Dust Map Based on Gaia and LAMOST

The Astrophysical Journal Supplement Series
We present a comprehensive 3D dust-reddening map covering the entire Milky Way, constructed by combining reddening estimates based on Large Sky Area Multi-Object Fiber Spectroscopy Telescope (LAMOST) low-resolution spectra ( E ( B  −  V ) _LAMOST ) with ...
Tao Wang, Haibo Yuan, Bingqiu Chen, Maosheng Xiang, Ruoyi Zhang, Bowen Huang, Hongrui Gu, Shuaicong Wang, Jiawei Li   +8 more
doaj   +1 more source

Interstellar Dust Grains: Ultraviolet and Mid-IR Extinction Curves

, 2019
7 pages, 3 figures, submitted to the Astro2020 Decadal ...
Gordon, Karl D., Misselt, Karl, Pendleton, Yvonne, Holwerda, Benne, Clark, Christopher, Clayton, Geoffrey, Hagen, Lea, Roman-Duval, Julia, Witt, Adolf, Wolff, Michael   +9 more
openaire   +2 more sources

Extinction by stratified interstellar dust grains

, 2010
We compute the optical properties of spherical dust grains composed of hollow silicate cores coated with two carbonaceous layers, the inner layer of mostly graphitic sp2 carbon and the outer layer of sp3 polymeric amorphous carbon, and explore the consequences on modelled interstellar extinction curves.
M. A. Iatì, 1, C. Cecchi Pestellini, CACCIOLA, ADRIANO, SAIJA, Rosalba, DENTI, Paolo, BORGHESE, Ferdinando   +6 more
openaire   +3 more sources

Expanded Sample of Small Magellanic Cloud Ultraviolet Dust Extinction Curves: Correlations between the 2175 Å Bump, q PAH, Ultraviolet Extinction Shape, and N(H i)/A(V)

The Astrophysical Journal
The Small Magellanic Cloud (SMC) shows a large variation in ultraviolet (UV) dust extinction curves, ranging from Milky Way (MW) like to significantly steeper curves with no detectable 2175 Å bump.
Karl D. Gordon, E. L. Fitzpatrick, Derck Massa, Ralph Bohlin, Jérémy Chastenet, Claire E. Murray, Geoffrey C. Clayton, Daniel J. Lennon, Karl A. Misselt, Karin Sandstrom   +9 more
doaj   +1 more source

The extinction law from photometric data: linear regression methods

, 2012
Context. The properties of dust grains, in particular their size distribution, are expected to differ from the interstellar medium to the high-density regions within molecular clouds.
Akritas, Alves, Bessell, C. J. Lada, Cambrésy, Chapman, Chapman, Draine, Flaherty, Fritz, Indebetouw, Isobe, J. Alves, J. Ascenso, Jones, Kenyon, Lombardi, Lutz, M. Lombardi, Martin, McClure, Nishiyama, Nishiyama, Ossenkopf, Rieke, Román-Zúñiga, Seares, Steinacker, Whittet, Whittet   +29 more
core   +1 more source

Interstellar extinction toward the CAS OB6 association: Where is the dust?

The Astronomical Journal, 1993
We have completed a multiband (ultraviolet, optical, and near-infrared) study of the interstellar extinction properties of nine massive stars in IC 1805 and IC 1848, which are both part of Cas OB6 in the Perseus spiral arm. Our analysis includes determination of absolute extinction over the wavelength range from 3 micrometers to 1250 A.
Margaret Murray Hanson, Geoffrey C. Clayton   +1 more
openaire   +1 more source

An Empirical Extinction Curve Revealed by Gaia XP Spectra and LAMOST

The Astrophysical Journal
We present a direct measurement of extinction curves using corrected Gaia XP spectra of the common sources in Gaia DR3 and LAMOST DR7. Our analysis of approximately 370,000 high-quality samples yielded a high-precision average extinction curve for the ...
Ruoyi Zhang, Haibo Yuan, Bowen Huang, Tao Wang, Lin Yang, Gregory M. Green, Xiangyu Zhang   +6 more
doaj   +1 more source

CO Line Emission and Absorption from the HL Tau Disk: Where is all the dust?

, 2005
We present high-resolution infrared spectra of HL Tau, a heavily embedded young star. The spectra exhibit broad emission lines of hot CO gas as well as narrow absorption lines of cold CO gas. The column density for this cooler material (7.5+/-0.2 x 10^18
Carr J. S., Craig Kulesa, Monin J. L., Sean D. Brittain, Terrence W. Rettig, Theodore Simon, Whittet D. C. B., Whittet D. C. B.   +7 more
core   +1 more source