Rotational velocities of early-type binaires (Howe+, 2009)

Details Rotational velocities of early-type binaires (Howe+, 2009) Rotational velocities of early-type binaires (Howe+, 2009)

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ycat..73920448h&link_type=abstract

VizieR On-line Data Catalog: J/MNRAS/392/448. Originally published in: 2009MNRAS.392..448H

Computer Science

Stars: Double And Multiple, Stars: Early-Type, Rotational Velocities

Scientific paper

We use information on the vsin(i) values of early-type binaries in order to search for correlations which may constrain the relative orientation of the stellar spin axes in binary systems. We find correlations in the case of close binaries which suggest that tidal synchronization is effective for binaries whose separation exceeds the stellar radius by more than an order of magnitude, in line with the theoretical predictions of Goldreich & Nicholson (1989ApJ...342.1079G) and the previous observational analysis of Giuricin et al. (1984A&A...135..393G). In the case of wide binaries, the vsin(i) values are not well correlated, which requires that the magnitude of the spin speeds is not tightly correlated. Under this assumption, we then find that the data provide no significant constraints on the degree of alignment of spin axes. The data are therefore compatible with scenarios (such as disc fragmentation or capture) which differ widely in the expected degree of spin alignment.
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