SIMBAD references

2006ApJ...648..580H - Astrophys. J., 648, 580-590 (2006/September-1)

Stellar rotation in young clusters. I. Evolution of projected rotational velocity distributions.

HUANG W. and GIES D.R.

Abstract (from CDS):

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 3.5 m and CTIO 4 m telescopes and Hydra multi-object spectrographs, and the target stars are members of 19 young open clusters with an age range of approximately 6-73 Myr. We made fits of the observed lines He I λλ4026, 4387, 4471, and Mg II λ4481, using model theoretical profiles to find projected rotational velocities for a total of 496 OB stars. We find that there are fewer slow rotators among the cluster B-type stars relative to nearby B stars in the field. We present evidence consistent with the idea that the more massive B stars (M>9 M_☉) spin down during their main-sequence phase. However, we also find that the rotational velocity distribution appears to show an increase in the numbers of rapid rotators among clusters with ages of 10 Myr and higher. These rapid rotators appear to be distributed between the zero age and terminal age main-sequence locations in the Hertzsprung-Russell diagram, and thus only a minority of them can be explained as the result of a spin-up at the terminal age main sequence due to core contraction. We suggest instead that some of these rapid rotators may have been spun up through mass transfer in close binary systems.

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Journal keyword(s): Line: Profiles - open clusters and associations: individual (Berkeley 86) - open clusters and associations: individual (IC 1805) - open clusters and associations: individual (IC 2395) - open clusters and associations: individual (IC 2944) - Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 457 - Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 869 - Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 884 - open clusters and associations: individual (NGC 1502) - Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 2244 - Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 2362 - open clusters and associations: individual (NGC 2384) - open clusters and associations: individual (NGC 2422) - open clusters and associations: individual (NGC 2467) - open clusters and associations: individual (NGC 3293) - open clusters and associations: individual (NGC 4755) - open clusters and associations: individual (NGC 6193) - open clusters and associations: individual (NGC 7160) - Galaxy: Open Clusters and Associations: Individual: Name: Trumpler 14 - Galaxy: Open Clusters and Associations: Individual: Name: Trumpler 16 - Stars: Early-Type - Stars: Rotation

VizieR on-line data: <Available at CDS (J/ApJ/648/580): table2.dat table3.dat obs.dat refs.dat table4.dat>

Nomenclature: Table 3: Cl* IC 2944 HG NNNNN N=5 among (Nos 10002-10012), Cl* NGC 2362 HG NNNNN (Nos 10005-10011), Cl* NGC 2384 HG NNNNN (Nos 10020-10032), Cl* NGC 2467 HG NNNNN (No. 10017), Cl* NGC 4755 HG NNNNN N=3 among (Nos 10046-10238), Cl* Trumpler 14 HG NNNNN (Nos 10040-10041), Cl* Trumpler 16 HG NNNNN (Nos 10047-10048).

Simbad objects: 517

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