Semi-analytical formulas for the Hertzsprung-Russell diagram
نویسندگان
چکیده
منابع مشابه
Semi-analytical formulas for the Hertzsprung-Russell Diagram
The absolute visual magnitude as function of the observed color (B-V) , also named Hertzsprung-Russell diagram can be described through five equations; that in presence of calibrated stars means eight constants. The developed framework allows to deduce the remaining physical parameters that are mass , radius and luminosity. This new technique is applied to the first 10 PC , the first 50 pc , th...
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We present absolute magnitudes for a sample of 52 barium stars observed by the HIPPARCOS satellite, and their location in the HR diagram. Our plot (Fig. 1) is restricted to stars with parallax accuracies better than 22 %. The luminosity classes range from Ib supergiants down to V dwarfs on the main sequence, as expected from spectral classification. Discrepancies are however noted. No gap is ob...
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HIPPARCOS trigonometrical parallaxes make it possible to compare the location of Tc-rich and Tc-poor S stars in the Hertzsprung-Russell (HR) diagram: Tc-rich S stars are found to be cooler and intrinsically brighter than Tc-poor S stars. The comparison with the Geneva evolutionary tracks reveals that the line marking the onset of thermal pulses on the asymptotic giant branch (AGB)matches well t...
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ژورنال
عنوان ژورنال: Serbian Astronomical Journal
سال: 2008
ISSN: 1450-698X,1820-9289
DOI: 10.2298/saj0877073z