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Intercombinational Line Profiles in the UV Spectra of T Tauri Stars and Analysis of the Accretion Zone
Lamzin, S. A.
We have analyzed for the first time profiles of the SiIII 1892 Å and CIII 1909 Å intercombinational lines in HST spectra of the stars RY Tau and RU Lup. The widths of these optically thin lines exceeded 400 km/s, ruling out formation in the stellar chromosphere. Since the intensity of the Si line exceeds that of the C line, it is unlikely that a l…
Solar Analogs: Spectral Energy Distributions and Physical Parameters of Their Atmospheres
Shenavrin, V. I.; Glushneva, I. N.; Roshchina, I. A.
The angular diameters, radii, and effective temperatures of 16 G0-G5 main-sequence stars with color excesses 0.60≤ B-V≤0.68 and parallaxes derived from Hipparcos data have been determined using their infrared fluxes, obtained from JHKLM photometric observations. For all the stars except BS 483, these effective temperatures differ from the spectros…
Short-Period Variations in the Proper Motions of Sunspots from SOHO (MDI) Observations
Didkovskiĭ, L. V.
Short-period (1 60 min) variations in the coordinates of the centers of gravity of isolated sunspots are analyzed. The sunspot coordinated were determined using two sets of observational data—magnetograms and intensities—obtained by SOHO (MDI) on December 6, 1998, from 01:00 to 21:57 UT with temporal resolution 60 s and spatial resolution 0.6″/pix…