Rotational velocities of A-type stars. III. Velocity distributions

By F. Royer, J. Zorec, A. Paris, I. D. Paris. 2006

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Aims. A sample of $v\sin i$ of B9 to F2-type main sequence single stars has been built from highly homogeneous ${v\sin i}$ parameters determined for a large sample cleansed of objects presenting the Am and Ap phenomenon as well as of all known binaries. The aim is to study the distributions of rotational velocities in the mass range of A-type stars for normal single objects. Methods. Robust statistical methods are used to rectify the ${v\sin i}$ distributions for the projection effect and the error distribution. The equatorial velocity distributions are obtained for about 1100 stars divided in six groups defined by the spectral type, under the assumption of randomly orientated rotational axes. Results. We show that late B and early A-type main-sequence stars have genuine bimodal distributions of true equatorial rotational velocities probably due to angular momentum loss and redistribution that the star underwent before reaching the main sequence. A striking lack of slow rotators is noticed among intermediate and late A-type stars.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/c6a4750c25984ccdf339721cefd618a823beb37d

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Citations in the corpus

Rotational velocities of A-type stars - IV. Evolution of rotational velocities (2012, background): “…for about 1100 stars, divided into six spectral type groups, carefully cleansed of objects presenting the Am/Ap phenomena and of all known binaries, Royer et al. (2007) showed that late B and early A-type MS stars have genuine bimodal distributions of true equatorial rotational velocities.”
BANYAN. XI. The BANYAN Σ Multivariate Bayesian Algorithm to Identify Members of Young Associations with 150 pc (2018, unknown): “…2001; (26) Stephenson 1986b; (27) Gray et al. 2003; (28) Nesterov et al. 1995; (29) Stephenson & Sanwal 1969; (30) Stephenson 1986a; (31) Evans 1967; (32) Royer et al. 2007; (33) Torres et al. 2006; (34) Mason et al. 2001; (35) Neuhäuser et al. 2003; (36) Zuckerman & Song 2004; (37) Gontcharov…”
The Effect of Stellar Rotation on Colour-Magnitude Diagrams: On the apparent presence of multiple populations in intermediate age stellar clusters (2009, background): “Royer et al. (2007) claim that the observed distribution of rotational velocities for A-type stars is bimodal.”