Results 171 to 180 of about 74,495 (201)
A binary merger product as the direct progenitor of a Type II-P supernova
Niu* Z +17 more
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Optimizing photosynthetic light-harvesting under stars: Generalized thermodynamic models
Chitnavis S +6 more
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Stellar Spectral Types and the H-R Diagram
2021We know stars are large balls of hot, glowing plasma fueled by the nuclear fusion occurring in their cores. This hot plasma emits blackbody radiation. At the surface of the star, the peak intensity in the spectrum corresponds to the surface temperature of the star. This peak in the spectrum correlates to a wavelength on the electromagnetic spectrum. As
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Efficient stellar spectral type classification for SDSS based on nonnegative matrix factorization
SPIE Proceedings, 2007The problem of identifying spectra collected by large sky survey telescope is urgent to study to help astronomers discover new celestial bodies. Due to spectral data characteristics of high-dimension and volume, principle component analysis (PCA) technique is commonly used for extracting features and saving operations.
Jinfu Yang, Zhongtian Liu, Fuchao Wu
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A robust approach to estimate stellar angular diameters from photometry and spectral type
SPIE Proceedings, 2014Observing reference stars with a known diameter is almost the only possibility to calibrate optical interferometry observations. The JMMC Calibrator Workgroup develops methods to ascertain the angular diameter of stars since 2000 and provides this expertise in the SearchCal software and associated databases.
A. Chelli +6 more
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Spectral synthesis of CARMENES M-type stars: stellar atmospheric parameters
2019We show our very first results regarding the stellar atmospheric parameter determinations (T_{eff} , log g, [Fe/H]) of M-type stars observed with CARMENES te{Carmenes} by means of the spectral synthesis method. We have selected spectral ranges around iron and titanium lines and molecular bands in three reference M-type stars: GX And (M1.0 V), Luyten's ...
Lázaro, F. +6 more
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The transfer of polarized radiation in spectral lines: Solar-type stellar atmospheres
Astrophysics and Space Science, 1984The polarization structure in several spectral lines in solar type stars is computed using the method described by McKenna (1981, 1984a). The frequency redistribution function used for these calculations is a linear combination ofRII andRIII. The line profiles and polarization structures have been computed for several weak solar resonance lines ...
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Guang pu xue yu guang pu fen xi = Guang pu, 2015
The radial velocity of the star is very important for the study of the dynamics structure and chemistry evolution of the Milky Way, is also an useful tool for looking for variable or special objects. In the present work, we focus on calculating the radial velocity of different spectral types of low-resolution stellar spectra by adopting a template ...
Feng-Fei, Wang +2 more
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The radial velocity of the star is very important for the study of the dynamics structure and chemistry evolution of the Milky Way, is also an useful tool for looking for variable or special objects. In the present work, we focus on calculating the radial velocity of different spectral types of low-resolution stellar spectra by adopting a template ...
Feng-Fei, Wang +2 more
openaire +1 more source