J/MNRAS/392/448 Rotational velocities of early-type binaries (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 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 1989ApJ...342.1079G)
and the previous observational analysis of Giuricin et al.
(1984A&A...135..393G 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:
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FileName Lrecl Records Explanations
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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
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See also:
III/135 : Henry Draper Catalogue and Extension (Cannon+ 1918-1924; ADC 1989)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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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
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Note (1): The flag is:
* = values of stellar radii taken from the references listed
blank = stellar radii are estimated from the spectral type
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 44 A21 --- Aut Author's name
46-102 A57 --- Com Comments
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Oct-2009