Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...153..269b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 153, no. 1, Dec. 1985, p. 269-272. Research supported by the Polska Akademia N
Astronomy and Astrophysics
Astrophysics
6
Calcium, Magnesium, Resonance Lines, Spectral Line Width, Stellar Rotation, Stellar Spectra, Chromosphere, Emission Spectra, Metallicity, Stellar Atmospheres
Scientific paper
In spite of the low rotational velocities of late type stars, which usually lie below 15 km s-1, the rotational broadening of emission cores of Ca II and Mg II lines cannot always be disregarded. The most sensitive to rotational broadening are full widths at half-maximum and central absorption features such as K3. It is shown that the FWHM changes linearly with Vrot for low rotational velocities, and that rotational broadening can explain additional "intrinsic" broadening of the strongest emissions found in the Wilson-Bappu relation by Glebocki and Stawikowski. The authors also show that the convolution procedure used in rotational broadening calculations is not correct for chromospheric lines, and should be avoided, especially when K2 and K3 features are analyzed.
Bielicz E.
Glebocki R.
Sikorski J.
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