Results 11 to 20 of about 791,194 (316)

Atmospheric and Fundamental Parameters of the Individual Components of Multiple Stellar Systems

open access: yesThe Astronomical Journal, 2023
We present detailed analyses of eight triple stellar systems (lying between 20 and 155 pc) and nine quadruple stellar systems (lying between 20 and 250 pc) with different configurations. Most of these systems are hierarchical.
Enas M. Abu-Alrob   +2 more
doaj   +1 more source

Spectroscopic Orbits of Subsystems in Multiple Stars. IX

open access: yesThe Astronomical Journal, 2023
New spectroscopic orbits of inner subsystems in 14 hierarchies are determined from long-term monitoring with the optical echelle spectrometer, CHIRON.
Andrei Tokovinin
doaj   +1 more source

CCD measurements of double and multiple stars at NAO Rozhen. III [PDF]

open access: yesSerbian Astronomical Journal, 2007
Using the 2-m telescope of the Bulgarian National Astronomical Observatory at Rozhen, observations of 55 multiple stars were carried out during one night, December 16/17. 2006.
Cvetković Z.   +4 more
doaj   +1 more source

Evaluating the effect of stellar multiplicity on the PSF of space-based weak lensing surveys [PDF]

open access: yes, 2015
The next generation of space-based telescopes used for weak lensing surveys will require exquisite point spread function (PSF) determination. Previously negligible effects may become important in the reconstruction of the PSF, in part because of the ...
Courbin, F., Kuntzer, T., Meylan, G.
core   +1 more source

CCD measurements of double and multiple stars at NAO Rozhen: II [PDF]

open access: yesSerbian Astronomical Journal, 2006
Using the 2-m telescope of the Bulgarian National Astronomical Observatory at Rozhen observations of twenty multiple stars were carried out during one whole night - October 30/31, and, also, during the first half of the next one - October 31. 2005.
Cvetković Z.   +3 more
doaj   +1 more source

Dynamical investigations of the multiple stars

open access: yesOpen Astronomy, 2017
Two multiple stars - the quadruple star - Bootis (ADS 9173) and the triple star T Taury were investigated. The visual double star - Bootiswas studied on the basis of the Pulkovo 26-inch refractor observations 1982-2013.
Kiyaeva Olga V., Zhuchkov Roman Ya.
doaj   +1 more source

Multiple Stellar Populations in Metal-poor Globular Clusters with JWST: A NIRCam View of M92

open access: yesThe Astrophysical Journal, 2023
Recent work on metal-intermediate globular clusters (GCs) with [Fe/H] = −1.5 and −0.75 has illustrated the theoretical behavior of multiple populations in photometric diagrams obtained with the JWST.
Tuila Ziliotto   +12 more
doaj   +1 more source

The multiplicity of massive stars in the Orion Nebula cluster as seen with long-baseline interferometry [PDF]

open access: yes, 2013
The characterization of multiple stellar systems is an important ingredient for testing current star formation models. Stars are more often found in multiple systems, the more massive they are.
Grellmann, Rebekka   +5 more
core   +1 more source

Dust Around T Tauri Stars [PDF]

open access: yesJournal of Astronomy and Space Sciences, 2011
To reproduce the multiple broad peaks and the fine spectral features in the spectral energy distributions (SEDs) of T Tauri stars, we model dust around T Tauri stars using a radiative transfer model for multiple isothermal circumstellar dust shells. We
Kyung-Won Suh, Young-Joo Kwon
doaj   +1 more source

Magnetic cycles at different ages of stars [PDF]

open access: yes, 2016
We study the different patterns of interannual magnetic variability in stars on or near the lower main sequence, approximately solar-type (G-K dwarf) stars in time series of 36 years from the Mount Wilson Observatory Ca\,{\sc ii}\,H\&K survey.
Baliunas, S.   +6 more
core   +2 more sources

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