Results 271 to 280 of about 5,043,235 (296)

A robust approach to estimate stellar angular diameters from photometry and spectral type

SPIE Proceedings, 2014
Observing 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, L. Bourges, G. Duvert, S. Lafrasse, G. Mella, J.-B. Le Bouquin, O. Chesneau   +6 more
openaire   +1 more source

Spectral synthesis of CARMENES M-type stars: stellar atmospheric parameters

2019
We 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., Montes, D., Tabernero, H., Marfil, E., Caballero, J., González Hernández, J., Consortium, C.   +6 more
openaire   +2 more sources

Efficient stellar spectral type classification for SDSS based on nonnegative matrix factorization

SPIE Proceedings, 2007
The 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
openaire   +1 more source

The transfer of polarized radiation in spectral lines: Solar-type stellar atmospheres

Astrophysics and Space Science, 1984
The 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 ...
openaire   +1 more source

On the impact of spectral template uncertainties in synthetic stellar populations

Monthly Notices of the Royal Astronomical Society, 2023
Conor M Byrne, Elizabeth Stanway
exaly  

[The radial velocity measurement accuracy of different spectral type low resolution stellar spectra at different signal-to-noise ratio].

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, A-Li, Luo, Yong-Heng, Zhao   +2 more
openaire   +1 more source

MIUSCAT: extended MILES spectral coverage - I. Stellar population synthesis models

Monthly Notices of the Royal Astronomical Society, 2012
Luis A Díaz-García, Jesús Falcón-Barroso, Alexandre Vazdekis   +2 more
exaly  

Spectral indices in quantitative spectral classification from stellar libraries

Astronomische Nachrichten, 1999
Th Schmidt-Kaler
exaly  

On the dispersion of the stellar colour‐equivalents and their distribution in relation to galaxy for the same spectral type

Astronomische Nachrichten, 1929
openaire   +1 more source

Spectral models for solar-scaled and α-enhanced stellar populations

Monthly Notices of the Royal Astronomical Society, 2007
Beatriz Barbuy, Paula Rodrigues Teixeira Coelho, Stéphane Charlot   +2 more
exaly