Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977pasp...89...19h&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 89, Feb.-Mar. 1977, p. 19-22.
Astronomy and Astrophysics
Astronomy
42
Early Stars, Oao 3, Spectral Line Width, Stellar Rotation, Stellar Spectra, Ultraviolet Spectra, Angular Velocity, Critical Velocity, Line Shape, Spaceborne Astronomy, Spectral Resolution
Scientific paper
Results are presented for line-width measurements made on visual spectra and Copernicus scans over the wavelength range from 1000 to 1300 A of twenty high-rotation, low-rotation, and reference early-type stars whose V sin i values are well known. The UV measurements were performed on the narrowest unblended lines, assuming that these would represent rotational broadening to the greatest possible extent. Mean values of FWHM in the UV from as many different lines as possible are used to average out the various line limb-darkening effects and to determine V, i, and the ratio of angular to critical velocity for each star. The accuracy of the results obtained is discussed. It is noted that although the values of V and i have an expected bias toward large values, they do not show any clustering or peculiar distribution that may indicate systematic errors in the measurements or analysis.
Hutchings John B.
Stoeckley Thomas R.
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