Results 1 to 10 of about 485 (176)
Interstellar reddening correction using He I lines [PDF]
, 2022 We present a method to derive the logarithmic extinction coefficient in optical wavelengths using the emission lines of HeI. Using this procedure we can avoid selection biases when studying regions with different surface brightness and we can obtain better measurements of temperature lines, for example [SIII]6312.
Zamora, S. +3 more
openaire +3 more sources
Interstellar velocity components towards reddened stars [PDF]
Monthly Notices of the Royal Astronomical Society, 2000 ABSTRA C T The paper analyses the profiles of interstellar features observed towards heavily reddened stars. All the features show spectacular Doppler-splitting but the radial velocities of the single components as well as the number of such components vary from feature to feature in the same spectrum.
G. A. Galazutdinov +2 more
openaire +2 more sources
Interstellar Reddening Effect on the Age Dating of Population II Stars [PDF]
Galaxies, 2017 The age measurement of the stellar halo component of the Galaxy is based mainly on the comparison of the main sequence turn-off luminosity of the globular cluster (GC) stars with theoretical isochrones.
Sergio Ortolani +2 more
doaj +2 more sources
Interstellar Polarization Survey. III. Relation between Optical Polarization and Reddening in the General Interstellar Medium [PDF]
The Astronomical Journal, 2023 Optical starlight can be partially polarized while propagating through the dusty, magnetized interstellar medium (ISM). The polarization efficiency describes the polarization intensity fraction per reddening unit, P _V / E ( B − V ), related to the ...
Y. Angarita +6 more
doaj +3 more sources
The Shape of the Interstellar Reddening Curve [PDF]
International Astronomical Union Colloquium, 1965 When the Observed Spectral Intensity Distribution of an early-type star has been freed from the distortions caused by absorption in the Earth's atmosphere and by instrumental sensitivity factors, it is a measure of the true spectral intensity distribution of the star and of the modifications to that distribution caused by the interstellar material ...
A. B. Underhill, G. A. H. Walker
openaire +3 more sources
Spectral Energy Distribution and Interstellar Reddening (Review Paper) [PDF]
International Astronomical Union Colloquium, 1987 AbstractWe review the recent results on flux distribution of Be stars from 320 to 850nm. It appears that data are available for only 10 to 15 % of the objects recognized as “normal” Be stars. The main current problems appear to be the variability of the continuous radiation, and the correction for interstellar reddening. Various attempts to solve these
L. Houziaux, J. Manfroid
openaire +2 more sources
The Correlation of Interstellar Reddening and Lα Absorption [PDF]
Symposium - International Astronomical Union, 1973 For 61 stars whose interstellar Lα absorption was observed by OAO-2, the average relation of H I column density to B – V color excess is equal to 5 × 1021 atoms cm–2 mag–1. For a recent dust grain model this value implies that the density ratio 〈ρHI/ρdust〉 ≈ 100.
Edward B. Jenkins, Blair D. Savage
openaire +2 more sources
A Study of Interstellar Reddening at High Galactic Latitudes [PDF]
Symposium - International Astronomical Union, 1973 A series of finding lists of A stars in regions at high galactic latitudes has been published in the last few years. Strömgren four-color and Hβ measures have been made of stars in five of the regions, allowing the interstellar absorption in each to be calculated.
A. G. D. Philip
openaire +2 more sources
Observations of Interstellar Reddening in Cygnus and Perseus [PDF]
International Astronomical Union Colloquium, 1965 The Object of the Edinburgh Spectrophotometry Survey is to determine the interstellar extinction law as precisely as possible and to search for intrinsic variations in it. The observations have been extended to early type stars up to a limiting magnitude of 11ṃ0 in regions extending from lII = 50° to lII = 200°.
K. Nandy
openaire +2 more sources
Interstellar reddening near the north galactic pole [PDF]
Publications of the Astronomical Society of the Pacific, 1972 Color excesses are obtained for 182 B-, A-, and F-type stars within about 20 degrees of the north galactic pole with the aid of BV, uvby , and (khg) photometry. The average value of the reddening in the vicinity of the pole is found to be 0"?0O0::::: 0.002.
Jr. Feltz K. A.
openaire +2 more sources