W. Morgan and others, a Roman numeral is added to the spectral class to specify the luminosity, or intrinsic intensity, of a star. A bright supergiant is Ia, a faint supergiant is Ib, a bright giant is II, a normal giant is III, a subgiant is IV, and a normal dwarf or main-...
During the early 20th century astronomers Hertzsprung and Russel independently discovered a correlation between the stellar luminosity (brightness corrected for distance) and spectral class. The stars on this diagram (HR Diagram) tend to lie along a broad band that climbs to the left (higher luminosi...
To classify and characterise the objects, visual and near infrared spectra have been obtained with VLT FORS and ISAAC. The spectral classification was performed using the shape of the spectra as well as spectral indices that are sensitive to the spectral type and luminosity class of M-type stars...
Clusters.- Emission Features of Several Be Stars as Related to their Luminosity Class and Spectral Type.- Rapid Variations in the Spectra of o And, ? A Slettebak 被引量: 0发表: 1976年 Critical study of the frequency of Be stars taking into account their outstanding characteristics A new ...
23. A complete MK designation includes both spectral type and luminosity class -for instance, the sun is a G2V. 一个完整的MK系统代号包含光谱类型和光度型两部分——例如,太阳属于G 2 V类恒星。 youdao 24. Scientists are able to determine the levels of the target molecule in solution by measur...
3. Despite the fact that the SiIV and CIV wind lines are variable in the Be stars, certain conclusions can be drawn from a statistical "snapshot" study such as this: a) The SiIV and CIV wind lines in the Be stars are correlated with both spectral type and luminosity class in the ...
An average wavelength; specifically, for a light filter or other light-transmitting device, a weighted average of the spectral energy distribution of the incident light, the transmittance of the device, and the luminosity function. McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright...
Only measurements made at a reciprocal dispersion of not more than 40 A/mm are used to plot average curves showing equivalent width as a function of spectral type and luminosity class for all 26 lines. In all but two cases (He I at 4121 A and Ca II at 4267 A), the behavior of the...
We have identified and calibrated diagnostic line ratios useful to derive the effective temperature (spectral type) and gravity (luminosity class) for cool stars observed at spectral resolutions 10,000 <= lambda/delta-lambda <= 20,000, bracketing that eventually chosen for GAIA. A few are ...
spectral luminosity classification ▼ Full browser ? ▲ Spectracular Spectracular spectral spectral spectral spectral Spectral Absorption Coefficient Spectral Accelerate Algorithm Spectral Acceleration Spectral Acceleration Generalized Forward-Backward Method Spectral Airglow Temperature Imager Spectral Analysis and Recog...