A system of standard stars for rotational velocity determinations

Details A system of standard stars for rotational velocity determinations A system of standard stars for rotational velocity determinations

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apjs...29..137s&link_type=abstract

Astrophysical Journal Supplement Series (Supplement no. 281), vol. 29, May 1975, p. 137-159. Research supported by the Ohio Sta

Astronomy and Astrophysics

Astrophysics

307

Angular Velocity, Line Spectra, Reference Stars, Stellar Rotation, Stellar Spectra, Astronomical Models, Atmospheric Models, F Stars, Radiant Flux Density, Rotational Spectra, Spectral Line Width, Standards

Scientific paper

Profiles for the He I lambda 4471, Mg II lambda 4481, and Fe I lambda 4476 lines were measured in the spectra of 217 bright northern and southern stars of types O9-F9, using photoelectric scans and photographic coude spectrograms obtained at the Cerro Tololo Inter-American Observatory, Kitt Peak National Observatory, and Lowell Observatory. Half-intensity widths of the observed line profiles were compared with the corresponding quantities in a set of theoretical rotationally-broadened line profiles computed using the model-atmosphere approach. The resulting v sin i's are used to establish a system of standard rotational velocity stars, for use in estimating v sin i directly from visual inspection of spectrograms. An atlas of rotationally broadened spectra is presented, showing the effects of rotation on spectra of representative B-, A-, and F-type stars.

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