3022 III/22 Rotation of Evolving A and F Stars I J Danziger S M Faber Astron. Astrophys. 18 428 1972 1972A&A....18..428D Rotational velocities Stars, A-type Stars, F-type The authors have studied a vertical strip in the HR diagram covering the range of spectral types A5 through F9. Rotational velocities for a total of 579 stars of all luminosity classes were accumulated. HR number, rotational velocity v sin(i), (b-y) index, m1, c1, reference and group are given.

Approximately 360 stars from the Bright Star Catalogue (Hoffleit, 1964) were observed with the coude spectrograph on the 84 in. telescope at Kitt Peak National Observatory at a dispersion of 13.6 A/mm. A few stars were observed with the coude spectrograph on the 100 in. telescope at Mt. Wilson. The re- mainder were obtained from the published material that the authors considered to provide reliable rotational velocities. The values given here generally agree with the mean v sin(i) found in the literature to within 15%. The method for determining the rotational velocities is somewhat different from the usual approach. A grid of standard stars, judged from their line-widths to have small rotation, was chosen. Five sections of their spectra traced on the microphotometer at Harvard College Observatory were mathematically broadened according to the usual formula to provide a grid of spectra with which observed spectra could be compared to obtain the rotational velocity.

HR Number in the Yale Catalogue of Bright Stars (Hoffleit D., 1964) --- vsin(i) Rotational Velocity v sin(i) for HR 3889 was given as "175,30*" in published catalog. v sin(i) for HR 3936 was given as " 90,30*". These values in this file are blank. km/s b-y (b-y) index mag m1 m1 (v-b) - (b-y) fr˜h (U,v,b,y) mag c1 c1 = (u-v) - (v-b) J mag ref Source of photometric data 1 = Stromgren B. & Perry C.L. (1962) 2 = Breger M. (1969) When no source is given, the data were obtained by the authors. --- group Group The main-sequence band was subdivided into six groups (A to F), each occupying a specific area in the HR diagram. (see Fig. 3 in the original paper) --- Julie Anne Watko SSDOO/ADC 1996May30 III_22.xml