III/22 Rotation of Evolving A and F Stars (Danziger+ 1972)
Rotation of Evolving A and F Stars
Danziger I.J. and Faber S.M.
<Astron. Astrophys., 18, 428 (1972)>
=1972A&A....18..428D 1972A&A....18..428D
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.
The rotational velocities are also included in the compilation by
Uesugi and Fukuda (catalog III/63)
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 remainder 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.
See also:
III/63 : Revised Catalogue of Rotational Velocities (Uesugi+ 1982)
V/50 : The Bright Star Catalogue, 5th Ed. (Hoffleit+ 1991)
GCPD/04 : General Catalog of Photometric Data, maintained at
Lausanne/Geneva Observatory
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)
41-46 F6.3 mag c1 ? c1 = (u-v) - (v-b)
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)
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References:
Breger M. (1969) Astrophys. J. Suppl. Ser., 19, 99.
=1969ApJS...19...99B 1969ApJS...19...99B
Danziger I.J. and Faber S.M. (1972) Astron. Astrophys., 18, 428.
=1972A&A....18..428D 1972A&A....18..428D
Hoffleit D. (1964) Catalogue of Bright Stars, Yale University Press.
=Catalog V/25
Stromgren B. & Perry C.L. (1962) Photoelectric uvby Photometry for
1217 Stars Brighter than V = 6.5mag.
(see catalog II/158, or GCPD/04)
(End) Julie Anne Watko [SSDOO/ADC] 30-May-1996