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J/MNRAS/392/448     Rotational velocities of early-type binaires   (Howe+, 2009)

An analysis of vsin(i) correlations in early-type binaries. Howe K.S., Clarke C.J. <Mon. Not. R. Astron. Soc., 392, 448-454 (2009)> =2009MNRAS.392..448H
ADC_Keywords: Stars, double and multiple ; Stars, early-type ; Rotational velocities Keywords: binaries: spectroscopic - binaries: visual - stars: early-type - stars: rotation Abstract: 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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 48 230 vsin(i) measurements for the components of the early-type binaries in our sample refs.dat 102 20 References
See also: III/135 : Henry Draper Catalogue and Extension (Cannon+ 1918-1924; ADC 1989) Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD HD number 7 A1 --- m_HD [AB] Multiplicity index on HD 9- 19 A11 --- SpType MK spectral type 21- 25 F5.1 km/s vsini Rotational velocity 27- 28 I2 km/s e_vsini ? rms uncertainty on vsini 30- 36 E7.3 AU Sep Separation 38- 42 F5.2 solRad Rad Stellar radius 43 A1 --- n_Rad [*] Method to estimate the stellar radius (1) 45- 48 A4 --- Ref References, detailed in refs.dat file
Note (1): The flag is: * = values of stellar radii taken from the references listed blank = stellar radii are estimated from the spectral type
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference number 4- 22 A19 --- BibCode BibCode 24- 44 A21 --- Aut Author's name 46-102 A57 --- Com Comments
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Oct-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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