J/MNRAS/284/265 Rotational Velocities of 373 OB stars (Howarth+ 1997)
Cross-correlation characteristics of OB stars from IUE spectroscopy.
Howarth I.D., Siebert K.W., Hussain G.A.J., Prinja R.K.
<Mon. Not. R. Astron. Soc. 284, 265 (1997)>
=1997MNRAS.284..265H 1997MNRAS.284..265H
ADC_Keywords: Rotational velocities ; Stars, OB ; Spectra, ultraviolet
Keywords: stars: early-type - stars: fundamental parameters -
stars: rotation - ultraviolet: stars
Abstract:
We present a catalogue of homogeneous measures of the linewidth
parameter, ve.sin(i), for 373 O-type stars and early supergiants
(including the separate components of 25 binary and triple systems),
produced by cross-correlating high-resolution, short-wavelength IUE
spectra against a `template' spectrum of τ Sco. We also tabulate
terminal velocities. There are no O supergiants in our sample with
ve.sin(i)<65km/s, and only one supergiant earlier than B5 has
ve.sin(i)<50km/s, confirming that an important line broadening
mechanism in addition to rotation must be present in these objects.
A calibration of the area under the cross-correlation peak against
spectral type is used to obtain estimates of continuum intensity
ratios of the components in 28 spectroscopically binary or multiple
systems. At least seven SB2 systems show evidence for the
`Struve-Sahade effect', a systematic variation in relative line
strength as a function of orbital phase. The stellar wind of the most
rapid rotator in our sample, the O9III:n* star HD 191423
(ve.sin(i)≤436km/s), show it to have a `wind-compressed disc'
similar to that of HD 93521; this star and other rapid rotators are
good candidates for studies of non-radial pulsation.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 81 376 Velocity Measurements (Table 3 of paper)
notes.dat 80 346 Individual Notes
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Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Designation of the star
17- 34 A18 --- SpType Adopted spectral type (1)
38- 40 A3 --- r_SpType *Source of spectral type (2)
45- 47 I3 km/s v.sin(i) ? V.sin(i) measurement, in km/s
48- 49 A2 --- u_v.sin(i) [: ] Uncertainty flag on v.sin(i)
53- 56 I4 km/s v(inf) ? Terminal wind velocity, in km/s (1)
57 A1 --- u_v(inf) [)] Uncertaintly flag on v(inf)
60- 81 A22 --- Notes Some alternative designations, and flags
'*' for comments in file "notes.dat" (3)
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Note (1): generally refers to combined spectrum in binary and multiple systems
Note (2): the source of Spectral Type is coded as follows:
CL = Conti & Leep (1974ApJ...193..113C 1974ApJ...193..113C);
CLL = Conti, Leep & Lorre (1977ApJ...214..759C 1977ApJ...214..759C);
DWC = Dworetsky, Whitelock & Carnochan (1982MNRAS.201..901D 1982MNRAS.201..901D);
F58 = Feast (1958MNRAS.118..618F 1958MNRAS.118..618F);
GCM = Garmany, Conti & Massey (1987AJ.....93.1070G 1987AJ.....93.1070G);
GGR = Georgelin, Georgelin & Roux (1973A&A....25..337G 1973A&A....25..337G);
GHS = Garrison, Hiltner & Schild (1977ApJS...35..111G 1977ApJS...35..111G);
HGS = Hiltner, Garrison & Schild (1969ApJ...157..313H 1969ApJ...157..313H);
HHC = Houk, Hartoog & Cowley (1976AJ.....81..116H 1976AJ.....81..116H);
HKB = Hill, Kilkenny & van Breda (1974MNRAS.168..451H 1974MNRAS.168..451H);
HMo = Hobbs et al. (1982ApJ...263..690H 1982ApJ...263..690H);
H70 = Hill (1970MNRAS.150...23H 1970MNRAS.150...23H);
MCB = McConnell & Bidelman (1976AJ.....81..225M 1976AJ.....81..225M);
MCW = Morgan, Code & Whitford (1955ApJS....2...41M 1955ApJS....2...41M);
M88 = Mathys (1988A&AS...76..427M 1988A&AS...76..427M);
M89 = Mathys (1989A&AS...81..237M 1989A&AS...81..237M);
S70 = Schild (1970ApJ...161..855S 1970ApJ...161..855S);
ThA = Thackeray & Andrews (1974A&AS...16..323T 1974A&AS...16..323T);
WPN = Walborn, Parker & Nichols (Cat. III/188);
W72, W73, W76, W81, W82 = Walborn (1972AJ.....77..312W 1972AJ.....77..312W,
1973AJ.....78.1067W 1973AJ.....78.1067W, 1976ApJ...205..419W 1976ApJ...205..419W, 1981ApJ...243L..37W 1981ApJ...243L..37W,
1982AJ.....87.1300W 1982AJ.....87.1300W).
Note (3): In the notes, "SWP" refers to sequential numbers of images taken
with the Short Wavelength Prime camera on the IUE.
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Name Name of star (repeated if several lines)
13- 80 A68 --- Text Text of note
--------------------------------------------------------------------------------
Acknowledgements:
Ian Howarth
Dept. Physics & Astronomy,
University College London,
Gower St., London WC1E 6BT, UK
http://www.star.ucl.ac.uk/~idh
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(End) Ian Howarth [UCL], Francois Ochsenbein [CDS] 30-Jun-1997