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III/22 Rotation of Evolving A and F Stars (Danziger+ 1972)
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Rotation of Evolving A and F Stars
Danziger I.J., Faber S.M.
<Astron. Astrophys., 18, 428 (1972)>
=1972A&A....18..428D
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ADC_Keywords: Rotational velocities; Stars, A-type; Stars, F-type
Description:
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.
Introduction:
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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
data.dat 56 580 Rotational Velocities and Photometric Data
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Byte-by-byte Description of file: data.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- HR *Number in the Yale Catalogue of Bright Stars
11- 13 I3 km/s vsin(i) *? Rotational Velocity
19- 24 F6.3 mag b-y ? (b-y) index
30- 35 F6.3 mag m1 ? m1 (v-b) - (b-y) fr¯h (U,v,b,y)
41- 46 F6.3 mag c1 ? c1 = (u-v) - (v-b) J
51 I1 --- ref *? Source of photometric data
56 A1 --- group *[A-N] Group
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Note on HR:
(Hoffleit D., 1964)
Note on vsin(i):
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.
Note on ref:
1 = Stromgren B. & Perry C.L. (1962)
2 = Breger M. (1969)
When no source is given, the data were obtained by the authors.
Note on 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)
References:
Breger M. (1969) Astrophys. J. Suppl. Ser., 19, 99.
Danziger I.J. and Faber S.M. (1972) Astron. Astrophys., 18, 428.
Hoffleit D. (1964) Catalogue of Bright Stars, Yale University Press.
Stromgren B. & Perry C.L. (1962) Photoelectric uvby Photometry for 1217 Stars
Brighter than V = 6.5mag.
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(End) Julie Anne Watko [SSDOO/ADC] 30-MAY-1996