Results 91 to 100 of about 218,608 (214)

Models for Interstellar Extinction in the Galaxy

The Astronomical Journal, 2005
We present two models for the interstellar extinction in the Galaxy that are based on the hypothesis that the interstellar dust is well mixed with the gas, with a constant ratio (except for a small dependence of metallicity on the Galactic radius), and therefore that the extinction is proportional to the column density of the gas. In the first model we
E. B. Amôres, J. R. D. Lépine
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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   +1 more source

Luminosity Distance and Extinction by Submicrometer-sized Grains

The Astrophysical Journal Letters
The distance to the stars is a fundamental parameter, which is determined via two primary methods—parallax and luminosity. While the parallax is a direct trigonometric method, the luminosity distance is usually influenced by interstellar extinction.
R. Siebenmorgen, Frank Heymann, R. Chini
doaj   +1 more source

The fullerane C60H2 and the interstellar extinction [PDF]

Monthly Notices of the Royal Astronomical Society, 1993
A measurement of the ultraviolet-visible absorption spectrum of C 60 H 2 , the dihydride of the soccer-ball molecule C 60 , is discussed in the context of the variable component of the interstellar extinction. The spectrum of C 60 H 2 consists of a smooth continuum with a series of rounded peaks in the ultraviolet.
openaire   +1 more source

The interstellar extinction to V4334 Sgr (Sakurai's object)

, 2002
We present an 8–13$~\mu$m spectrum of V4334 Sgr (Sakurai's object), which shows clear evidence for the presence of a silicate absorption feature at 9.7$~\mu$m.
T. R. Geballe, S. P. S. Eyres, V. H. Tyne, B. Smalley, A. Evans   +4 more
core   +1 more source

Luminosity and Intrinsic Color Calibration of Main-Sequence Stars With 2Mass Photometry: All Sky Local Extinction

Open Astronomy, 2003
We present a new color index vs. absolute magnitude calibration of 2MASS JHK photometry. For the A0 to ~G5 and M segments of the main sequence information on the amount of interstellar extinction and its location in space may be obtained.
Knude Jens, Fabricius Claus
doaj   +1 more source

Modelling interstellar extinction in three dimensions

, 2004
We have developed a technique that estimates the threedimensional extinction in the Galactic plane. The colour distribution (J-K) of stars from the Two Micron All Sky Survey (2MASS) are compared to that of stars from the Besançon model of the Galaxy, to ...
Marshall, Doug, Reylé, Céline, Schultheis, Mathias, Robin, Annie C.   +3 more
core   +1 more source

The Infrared Complex Refractive Index and Band Strengths of Coronene Thin Films

The Astrophysical Journal
Polycyclic aromatic hydrocarbon (PAH) molecules have long been theorized to be present in a multitude of interstellar environments. The radio-frequency detections of specific cyanosubstituted PAH molecules in the Taurus Molecular Cloud have provided new ...
J. E. Roser, L. Jovanović, A. Ricca
doaj   +1 more source

Foreground Dust Properties toward the Cluster NGC 7380

The Astronomical Journal
Using starlight polarization, we present the properties of foreground dust toward cluster NGC 7380 embedded in H ii region Sh 2-142. Observations of starlight polarization are carried out in four filters using an imaging polarimeter equipped with a 104 ...
Sadhana Singh, Jeewan C. Pandey, Thiem Hoang, Neelam Panwar, Biman J. Medhi, Vishal Joshi, Shashikiran Ganesh   +6 more
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Interstellar Extinction [PDF]

Symposium - International Astronomical Union, 1970
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