A system of standard stars for rotational velocity determinations. (original) (raw)

NASA/ADS

;

• Collins, G. W., II ;
• Boyce, P. B. ;
• White, N. M. ;
• Parkinson, T. D.

Abstract

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.

Publication:

The Astrophysical Journal Supplement Series

Pub Date:

May 1975

DOI:

10.1086/190338

Bibcode:

1975ApJS...29..137S

Keywords:

• 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;
• Astronomy