Results 51 to 60 of about 11,728,534 (352)
Studying the UV Mg II Resonance Lines in 20 Be Stars
Open Astronomy, 2011 Using the GR model, we analyze the UV Mg II resonance lines in the spectra of 20 Be stars of different spectral subtypes, in order to detect the presence of satellite or discrete absorption components. The values of some physical parameters – rotational,
Antoniou A. +3 more
doaj +1 more source
Open Astronomy, 2011 White dwarf stars are traditionally found to have surface compositions made primarily of hydrogen or helium. However, a new family has recently been uncovered, the so-called hot DQ white dwarfs, which have surface compositions dominated by carbon and ...
Dufour P. +3 more
doaj +1 more source
FUNDAMENTAL PARAMETERS OF KEPLER ECLIPSING BINARIES. I. KIC 5738698 [PDF]
, 2016 Eclipsing binaries serve as a valuable source of stellar masses and radii that inform stellar evolutionary models and provide insight into additional astrophysical processes.
R. Matson, D. Gies, Zhao Guo, J. Orosz
semanticscholar +1 more source
Analysis of atomic-clock data to constrain variations of fundamental constants [PDF]
New Journal of Physics, 2023 We present a new framework to study the time variation of fundamental constants in a model-independent way. Model independence implies more free parameters than assumed in previous studies.
N. Sherrill +15 more
semanticscholar +1 more source
THE PAN-PACIFIC PLANET SEARCH. V. FUNDAMENTAL PARAMETERS FOR 164 EVOLVED STARS [PDF]
, 2016 We present spectroscopic stellar parameters for the complete target list of 164 evolved stars from the Pan-Pacific Planet Search, a five-year radial velocity campaign using the 3.9 m Anglo-Australian Telescope.
R. Wittenmyer +5 more
semanticscholar +1 more source
Fundamental stellar parameters of benchmark stars from CHARA interferometry [PDF]
Astronomy & Astrophysics, 2020 Context. Benchmark stars are crucial as validating standards for current as well as future large stellar surveys of the Milky Way. However, the number of suitable metal-poor benchmark stars is currently limited, owing to the difficulty in determining ...
I. Karovicova +6 more
semanticscholar +1 more source
Spectral Classification of Faint Carbon Stars
Open Astronomy, 2003 R-N classification of 187 faint carbon stars is based on the classical criteria adjusted to the yellow-red spectral region, with two new criteria added - the ratios of the red CN bands 6206/6332 (Å) and 6478/6631 (Å).
Eglitis I., Eglite M., Balklavs A.
doaj +1 more source
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
A spectroscopic investigation of the O-type star population in four Cygnus OB associations. II. Determination of the fundamental parameters [PDF]
, 2015 Aims. Having established the binary status of nineteen O-type stars located in four Cygnus OB associations, we now determine their fundamental parameters to constrain their properties and their evolutionary status.
L. Mahy +4 more
semanticscholar +1 more source
Measuring Fundamental Galactic Parameters with Stellar Tidal Streams and SIM PlanetQuest [PDF]
, 2005 Extended halo tidal streams from disrupting Milky Way satellites offer new opportunities for gauging fundamental Galactic parameters without challenging observations of the Galactic center.
Allyson A. Polak +7 more
core +1 more source