stars: individual: 3 Pup, BD+48 degrees 1220, alpha CygUsing the data from the observations carried out with a high spectral resolution of R = 60 000 at the 6-m BTA telescope in combination with the echelle spectrograph NES, we thoroughly studied the characteristics of the optical spectra ...
We present new photometric and spectral observations of the newly discovered nova-like eclipsing star 2MASS J01074282+4845188. To obtain a light curve solution we used model of a nova-like star whose emission sources are a white dwarf surrounded by an accretion disk, a secondary star filling ...
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Blue Giant Starshave spectral types O, B, A. O is a deep blue, B is more white and As is very light, bordering on white. Blue stars are the hottest stars in the universe. Red stars, immaterial of size, are the coolest stars in the universe. Onlybrown starsare cooler. Brown stars...
Planets with radii between that of the Earth and Neptune (hereafter referred to as ‘sub-Neptunes’) are found in close-in orbits around more than half of all Sun-like stars1,2. However, their composition, formation and evolution remain poorly understood3. The study of multiplanetary systems...
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THE star τ Sco, HD149438, spectral type B0 V, was observed spectroscopically by the Princeton telescope-spectrometer on the Copernicus satellite during June and July 1973. This star is well known 1 as being one of the few early type stars with a small projected rotational velocity, v-sin ...
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stars with an SNR(PMa) > 3, but still, the median mass is 1.20M⊙. The RV surveys provide results for stars with spectral type later than F5 and down to K9, that is in the 0.60–1.33M⊙range using data by Pecaut and Mamajek64. The median mass of the stars we considered in...
RStoolbox - Toolbox for remote sensing image processing and analysis such as calculating spectral indices, principal component transformation, unsupervised and supervised classification or fractional cover analyses. rworldmap - Mapping Global Data. s2 - R bindings for Google's s2 library for geometry ...