J/ApJ/722/605 A stellar rotation census of B stars (Huang+, 2010)
A stellar rotation census of B stars: from ZAMS to TAMS.
Huang W., Gies D.R., McSwain M.V.
<Astrophys. J., 722, 605-619 (2010)>
=2010ApJ...722..605H 2010ApJ...722..605H
ADC_Keywords: Clusters, open ; Stars, B-type ; Radial velocities ;
Rotational velocities ; Effective temperatures ; Stars, masses
Keywords: line: profiles - open clusters and associations: individual (IC 4996,
NGC 581, NGC 869, NGC 884, NGC 1893, NGC 1960) - stars: early-type -
stars: fundamental parameters - stars: rotation
Abstract:
Two recent observing campaigns provide us with moderate dispersion
spectra of more than 230 cluster and 370 field B stars. Combining them
and the spectra of the B stars from our previous investigations (∼430
cluster and ∼100 field B stars) yields a large, homogeneous sample for
studying the rotational properties of B stars. We derive the projected
rotational velocity vsini, effective temperature, gravity, mass, and
critical rotation speed Vcrit for each star. We compare the
evolutionary trends of rotation (measured according to the polar
gravity of the star) with recent models that treat internal mixing.
Description:
We made observations of the 9 open clusters targeted with the
Wisconsin-Indiana-Yale-NOAO (WIYN) 3.5m telescope at Kitt Peak
National Observatory (KPNO) during 2006 October 4-7 UT. We used the
Hydra multi-object spectrometer to obtain moderate resolution spectra
(R∼4600) in the blue region (4000-4600Å). The errors in the radial
velocity measurements (made through cross-correlation of the observed
and synthetic line profiles) are estimated to be ∼6.5km/s.
We obtained the field B star spectroscopic observations with the KPNO
2.1m telescope and Goldcam spectrograph during 2008 November 14-18 and
2008 December 9-12 (resolving power of R∼2400).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 122 234 Stellar parameters of new cluster B stars
table4.dat 123 375 Stellar parameters of new field B stars
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See also:
J/A+A/539/A74 : NGC1893 Chandra X-ray catalog (Caramazza+, 2012)
J/A+A/527/A77 : NGC 1893 optical and NIR photometry (Prisinzano+, 2011)
J/A+A/515/A16 : UBVI light curves of NGC 884 variables (Saesen+, 2010)
J/A+A/506/213 : B6-B9.5 stars abundance analysis (Niemczura+, 2009)
J/A+A/488/211 : Infrated photometry of NGC 1893 (Caramazza+, 2008)
J/MNRAS/379/1237 : VIcJHK photometry of NGC 1893 Ha sources (Maheswar+, 2007)
J/other/Ap/50.194 : Groups of stars in NGC 1893 (Hovhannessian+, 2007)
J/AJ/133/1092 : vsini of B0-B3 stars in 7 young clusters (Wolff+, 2007)
J/AJ/129/809 : B-star rotational velocities in h and chi Persei (Strom+, 2005)
J/ApJ/573/359 : Rotational velocities of B stars from BSC (Abt+, 2002)
J/A+A/357/471 : BV and proper motions in NGC 1960 + NGC 2194 (Sanner+, 2000)
J/A+A/349/448 : Open star clusters. I. NGC 581 (M 103) (Sanner+, 1999)
J/A+A/345/505 : UBVI magnitudes of NGC 869 B-type pulsators (Krzesinski+, 1999)
J/AJ/116/1801 : IC 4996 CCD photometry (Delgado+, 1998)
J/A+A/325/987 : UBV magnitude of NGC 884 B-type pulsators (Krzesinski+ 1997)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Cluster Cluster name
10- 13 I4 --- WEBDA WEBDA identification number (1)
15- 18 I4 km/s HRV1 ?=-999 First night heliocentric radial
velocity (2)
20- 23 I4 km/s HRV2 ?=-999 Second night heliocentric radial
velocity (2)
26- 28 I3 km/s vsini Projected equatorial rotational velocity
31- 32 I2 km/s e_vsini Error in vsini
35- 39 I5 K Teff ?=-999 Effective temperature
41- 44 I4 K e_Teff ?=0 Measurement error in Teff
46- 51 F6.3 [cm/s2] log(g) ?=-9.999 Log of the gravitational acceleration
54- 58 F5.3 [cm/s2] e_log(g) ?=0 Measurement error in log(g)
60- 65 F6.3 [cm/s2] log(g)P ?=-9.999 Estimated log(g) at the stellar pole
68- 71 F4.1 [Msun] logM ?=-1 Log of the stellar mass
75- 77 I3 km/s Vc ?=-99 Critical velocity
81-122 A42 --- Comm Additional comment(s)
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Note (1): The stars in the same cluster are grouped together, and listed in
an ascending order of their WEBDA ID (http://www.univie.ac.at/webda/).
The name of the cluster is given in the comment area of the first star
of the cluster. Stars with an index number >9000 are not in the WEBDA
database; see the comment area for their RA and Dec.
Note (2): The HJD for the radial velocity measurements are:
-----------------------------------
HJD(N1) HJD(N2)
-----------------------------------
IC4996 2454015.649 2454016.580
NGC1893 2454014.010 2454015.923
NGC1960 2454015.982 2454016.968
NGC581 2454015.788 2454016.798
NGC6871 2454013.662 2454015.587
NGC7380 2454015.720 2454016.672
NGC7654 2454013.778 2454016.730
NGC869 2454013.874 2454015.869
NGC884 2454014.877 2454016.914
-----------------------------------
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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- 6 I6 --- SAO SAO number (Cat. I/131) of the star
9- 14 I6 --- HD ? HD number when available
17- 25 F9.5 d HJD1 First night HJD of first exposure; -2454000
28- 32 F5.1 km/s HRV1 First night heliocentric radial velocity
35- 43 F9.5 d HJD2 Second night HJD of first exposure; -2454000
46- 50 F5.1 km/s HRV2 Second night heliocentric radial velocity
53- 55 I3 km/s vsini Projected equatorial rotational velocity
58- 59 I2 km/s e_vsini Error in vsini
62- 66 I5 K Teff ?=-999 Effective temperature
69- 71 I3 K e_Teff ?=0 Measurement error in Teff
74- 79 F6.3 [cm/s2] log(g) ?=-9.999 Log of surface gravitational
acceleration
82- 86 F5.3 [cm/s2] e_log(g) ?=0 Measurement error in log(g)
89- 94 F6.3 [cm/s2] log(gP) ?=-9.999 Estimated log(g) at the stellar pole
97-100 F4.1 [Msun] logM ?=-1 Log of the stellar mass
103-105 I3 km/s Vc ?=-99 Critical velocity
108-123 A16 --- Comm Additional comment(s)
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 11-Jul-2012