J/ApJ/648/580 Rotational velocities in 19 open clusters (Huang+, 2006)
Stellar rotation in young clusters.
I. Evolution of projected rotational velocity distributions.
Huang W., Gies D.R.
<Astrophys. J., 648, 580-590 (2006)>
=2006ApJ...648..580H 2006ApJ...648..580H
ADC_Keywords: Clusters, open ; Radial velocities ; Rotational velocities
Keywords: line: profiles - open clusters and associations: individual
(Berkeley 86, IC 1805, IC 2395, IC 2944, NGC 457, NGC 869, NGC 884,
NGC 1502, NGC 2244, NGC 2362, NGC 2384, NGC 2422, NGC 2467, NGC 3293,
NGC 4755, NGC 6193, NGC 7160, Trumpler 14, Trumpler 16) -
stars: early-type - stars: rotation
Abstract:
Open clusters offer us the means to study stellar properties in
samples with well-defined ages and initial chemical composition. Here
we present a survey of projected rotational velocities for a large
sample of mainly B-type stars in young clusters to study the time
evolution of the rotational properties of massive stars. The survey is
based on moderate-resolution spectra made with the WIYN 3.5m and CTIO
4m telescopes and Hydra multi-object spectrographs, and the target
stars are members of 19 young open clusters with an age range of
approximately 673Myr. We made fits of the observed lines HeI
λλ4026, 4387, 4471, and MgII λ4481, using model
theoretical profiles to find projected rotational velocities for a
total of 496 OB stars.
Description:
Observations were made on 2000 Nov 13-16 on WIYN 3.5m and on 2001 Feb
9-12 on CTIO 4m.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 24 21 ZAMS model star parameters
table3.dat 147 496 Projected Rotational Velocities of B Stars
in 19 Open Clusters
obs.dat 49 19 The heliocentric Julian date of observation
for each night
refs.dat 93 19 Webda numbering systems references
table4.dat 51 19 Summary data for 19 open clusters
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See also:
J/ApJ/648/591 : Stellar rotation in young clusters. II. (Huang+, 2006)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Index Index
4- 9 A6 --- PSpType Pseudospectral SubType spectral type
12- 15 F4.1 kK Teff Effective temperature
17- 20 F4.1 solMass M Mass
22- 24 F3.1 solRad R Radius
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Cluster Cluster name
14- 18 I5 --- WEBDA Webda ID (http://obswww.unige.ch/web) (1)
20- 22 I3 km/s vsini Derived projected rotational velocity
24- 25 I2 km/s e_vsini Measurement error in vsini
27- 32 F6.1 km/s RV1 Radial velocity from first night,
HJD specified in obs.dat file
34- 39 F6.1 km/s RV2 ? Radial velocity from second night if
available, HJD specified in obs.dat file
41- 46 F6.1 km/s RV3 ? Radial velocity from third night if available,
HJD specified in obs.dat file
48- 51 F4.1 --- Index Index of estimated pseudo-spectral type,
detailed in table2.dat
53-147 A95 --- Notes Additional notes
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Note (1): For stars not in the WEBDA database, we assign a number > 10000
and give an identification and coordinates for epoch 2000.0 in the
"Notes" column; the other stars are listed using the Webda numbering
systems from references detailed in refs.dat file.
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Byte-by-byte Description of file: obs.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Cluster Cluster name
13- 23 F11.3 d HJD1 Heliocentric Julian date of night 1
26- 36 F11.3 d HJD2 ? Heliocentric Julian date of night 2
39- 49 F11.3 d HJD3 ? Heliocentric Julian date of night 3
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Cluster Cluster name
13- 31 A19 --- BibCode BibCode
33- 50 A18 -- Aut Author's name
52- 71 A20 --- Com Comments
73- 93 A21 --- Acronym Acronym used in Simbad name for stars in this
cluster with number <10000
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Cluster Cluster name
14- 17 F4.2 [yr] logAge Age
19- 20 I2 --- N Number of stars
22- 24 I3 km/s Mean rotational velocity from all stars
26- 27 I2 --- NB3 Number of stars with SpType≤B3
29- 31 I3 km/s B3 Mean rotational velocity from stars with
SpType≤B3
33 I1 --- N300 Number of stars with vsini>300km/s
36- 37 I2 % N300p Number of stars with vsini>300km/s
in percentage
40- 41 I2 --- Nbin ? Number of binaries
44- 45 I2 % Nbinp ? Number of binaries in percentage
48- 51 A4 A4 --- Obs Observatory (CTIO or WIYN)
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 17-Jul-2008