J/ApJ/648/591 Stellar rotation in young clusters. II. (Huang+, 2006)
Stellar rotation in young clusters.
II. Evolution of stellar rotation and surface helium abundance.
Huang W., Gies D.R.
<Astrophys. J., 648, 591-606 (2006)>
=2006ApJ...648..591H 2006ApJ...648..591H
ADC_Keywords: Clusters, open ; Spectroscopy ; Abundances ;
Keywords: line: profiles - stars: abundances - stars: early-type -
stars: fundamental parameters - stars: rotation
Abstract:
We derive the effective temperatures and gravities of 461 OB stars in
19 young clusters by fitting the Hγ profile in their spectra. We
use synthetic model profiles for rotating stars to develop a method to
estimate the polar gravity for these stars, which we argue is a useful
indicator of their evolutionary status. We combine these results with
projected rotational velocity measurements obtained in a previous
paper on these same open clusters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 86 461 Stellar Physical Parameters
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See also:
J/ApJ/648/580 : Rotational velocities of 19 open clusters (Huang+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Cluster Common cluster name
13 A1 --- n_WEBDA [*] probable O-type star (1)
15- 19 I5 --- WEBDA Webda ID (http://www.univie.ac.at/webda/) (2)
21- 25 I5 K Teff Effective temperature
27- 30 I4 K e_Teff Measurement error in Teff
32- 36 F5.3 [cm/s2] log(g) Log of the gravitational acceleration
38- 42 F5.3 [cm/s2] e_log(g) Measurement error in log(g)
44- 46 I3 km/s vsini Projected equatorial rotational velocity
48- 52 F5.3 [cm/s2] log(g)P Estimated log(g) at the stellar pole
54- 59 F6.3 [Sun] A(4026) ? Helium abundance from He I 4026 line (3)
61- 66 F6.3 [Sun] A(4387) ? Helium abundance from He I 4387 line (3)
68- 73 F6.3 [Sun] A(4471) ? Helium abundance from He I 4471 line (3)
75- 80 F6.3 [Sun] <He> ? Average Helium abundance from 3 He I lines
82- 86 F5.3 [Sun] e_<He> ? Measurement error in <He>
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Note (1): Asterisk indicates probable O-type star (He II 4200 present)
for which Teff and log(g) estimates may be low.
Note (2): Stars with an index number >10000 are not in the WEBDA database;
see their positional data in Paper I, Cat J/ApJ/648/580.
Note (3): Blank values mean that it is not measurable or that measurements
are not reliable.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 17-Jul-2008