Results 21 to 30 of about 440,001 (300)
Zeeman-Doppler Imaging of Late-Type Stars -- The Surface Magnetic Field of II Peg [PDF]
, 2007 Late-type stars in general possess complicated magnetic surface fields which makes their detection and in particular their modeling and reconstruction challenging. In this work we present a new Zeeman-Doppler imaging code which is especially designed for
Berdyugina +18 more
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Isochrones for late-type stars [PDF]
Proceedings of the International Astronomical Union, 2008 AbstractA brief summary of the history of stellar evolution theory and the use of isochrones is given. The present state of the subject is summarized. The major uncertainties in isochrone construction are considered: chemical abundances and color calibrations, and the treatment of turbulent convection in stellar interior and atmosphere models.
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The Origin of Star Formation in Early-type Galaxies Inferred from Spatially Resolved Spectroscopy
The Astrophysical Journal, 2023 We investigate the origin of star formation activity in early-type galaxies with current star formation using spatially resolved spectroscopic data from the Mapping Nearby Galaxies at Apache Point Observatory in the Sloan Digital Sky Survey (SDSS).
Yun Hee Lee +4 more
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SPECTROSCOPIC ORBITS FOR 15 LATE-TYPE STARS
The Astronomical Journal, 2016 ABSTRACT Spectroscopic orbital elements are determined for 15 stars with periods from 8 to 6528 days with six orbits computed for the first time. Improved astrometric orbits are computed for two stars and one new orbit is derived. Visual orbits were previously determined for four stars, four stars are members of multiple systems, and ...
Daryl W. Willmarth +3 more
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The Wolf-Rayet stars in M31: I. Analysis of the late-type WN stars
, 2014 Context: Comprehensive studies of Wolf-Rayet stars were performed in the past for the Galactic and the LMC population. The results revealed significant differences, but also unexpected similarities between the WR populations of these different galaxies ...
Hainich, Rainer +3 more
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Magnetic Field Measurements of Low-mass Stars from High-resolution Near-infrared IGRINS Spectra
The Astronomical Journal, 2023 We present average magnetic field measurements derived from high-resolution near-infrared IGRINS spectra of a carefully selected sample of 28 M dwarfs. All 28 have reported magnetic field strengths in the literature.
Eunkyu Han +3 more
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Differential Line Shifts in Late Type Stars [PDF]
International Astronomical Union Colloquium, 1980 AbstractThe differential line shifts method for studying convective type motions has been described in the review of Glebocki and Stawikowski at this colloquium. Here the results of differential line shifts for twenty late type stars are presented. Line shifts were determined either from published wavelength measurements (α CMi, β Peg, α Boo, α Ser, α ...
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Stellar parameters of Be stars observed with X-shooter
, 2017 Aims. The X-shooter archive of several thousand telluric star spectra was skimmed for Be and Be-shell stars to derive the stellar fundamental parameters and statistical properties, in particular for the less investigated late type Be stars, and the ...
Abo-Elazm, M. S. +12 more
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On the Sodium versus Iron Correlation in Late B-Type Stars [PDF]
, 2013 With an aim to study whether the close correlation between [Na/H] and [Fe/H] recently found in A-type stars further persists in the regime of B-type stars, the abundances of Na were determined for 30 selected sharp-lined late B-type stars (10000K < T_eff
Kawanomoto, Satoshi +2 more
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Flares in late-type stars: X-ray [PDF]
International Astronomical Union Colloquium, 1995 Flare-like brightenings, similar to those observed on the Sun but on a larger energy scale, are observed in a variety of late-type stars, including classical M dwarf flare stars, RS CVn-type binaries and pre-main sequence (PMS) objects. These events, which are observable over the whole electromagnetic spectrum, are interpreted as due to rapid release ...
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