Up: Rotational velocities of A-type stars

Appendix C: Notes on common stars with Abt & Morrell (1995) rejected by sigma-clipping

When merging the sample from Abt & Morrell (1995) with the new measurements using Fourier transforms, common data are compared in order to compute the scaling law between both samples. Aberrant points are discarded using a sigma-clipping algorithm. These stars are listed and discussed, and their $\ensuremath{v\sin i}$ are indicated in $\ensuremath{{\rm km}~{\rm s}^{-1}}$ ( $\ensuremath{v\sin i} _{{\rm I}\cup {\rm II}} / \ensuremath{v\sin i} _{{\rm AM}}$ ):

HD 18778 (26/43) is a spectroscopic binary whose period is measured by Abt (1961): $P_{\rm orb} = 11\hbox{$.\!\!^{\rm d}$ }665$ . Its $\ensuremath{v\sin i}$ is found to be 20 $\ensuremath{{\rm km}~{\rm s}^{-1}}$ by Dobrichev (1985).
HD 27962 (11/15) is a binary star from HIPPARCOS data.
HD 29573 (26/31) is detected as variable from HIPPARCOS observations, with unsolved solution.
HD 32115 (12/15).
HD 33204 (160/45) is an Am star in Hyades and is the primary component of the triple system ADS 3730. It is detected as a binary star by HIPPARCOS. Debernardi et al. (2000) compute the orbital parameters of this SB1 star, and derive its $\ensuremath{v\sin i} =24.0\pm 2.4$ $\ensuremath{{\rm km}~{\rm s}^{-1}}$ .
HD 37594 (14/15) $^\star$ .
HD 43760 (9/15) is suspected to be variable in radial velocity (Hui-Bon-Hoa 2000), and its $\ensuremath{v\sin i}$ is found to be 13 $\ensuremath{{\rm km}~{\rm s}^{-1}}$ .
HD 50644 (12/13) $^\star$ is indicated as micro-variable in the HIPPARCOS catalogue. Speckle observations (Hartkopf et al. 1997) allow the measurement of the separation of the system components $\rho= 0\hbox{$.\!\!^{\prime\prime}$ }159$ .
HD 71297 (11/13) $^\star$ is a suspected binary from HIPPARCOS data.
HD 72660 (9/10) $^\star$ is a low rotator $\ensuremath{v\sin i} =6.5$ $\ensuremath{{\rm km}~{\rm s}^{-1}}$ in Nielsen & Wahlgren (2000) and 6 $\ensuremath{{\rm km}~{\rm s}^{-1}}$ in Varenne (1999).
HD 111786 (45/135) is a periodic variable star in the HIPPARCOS catalogue. Its spectrum is composite (Faraggiana et al. 2001) and HD 111786 appears to be a multiple system.
HD 115604 (15/15) $^\star$ .
HD 132145 (15/30) has also been observed by Ramella et al. (1989) who find $\ensuremath{v\sin i} = 16.6$ $\ensuremath{{\rm km}~{\rm s}^{-1}}$ .
HD 158716 (15/35) has also been observed by Ramella et al. (1989) who find $\ensuremath{v\sin i} = 19.6$ $\ensuremath{{\rm km}~{\rm s}^{-1}}$ .
HD 159082 (21/30) has also been observed by Ramella et al. (1989) who find $\ensuremath{v\sin i} = 19.6$ $\ensuremath{{\rm km}~{\rm s}^{-1}}$ . SB $P_{\rm orb} = 6.79750$ (Stickland & Weatherby 1984)
HD 159480 (28/40) is analyzed by Lemke (1989) who derives a $\ensuremath{v\sin i}$ from spectral synthesis: 27 $\ensuremath{{\rm km}~{\rm s}^{-1}}$ . HD 159480 has a negative result in speckle interferometry (McAlister et al. 1987).
HD 159834 (18/28).
HD 160839 (40/51).
HD 175687 (10/10) $^\star$ .
HD 187340 (15/33).
HD 192640 (86/35) is an unsolved variable star in the HIPPARCOS catalogue.
HD 203858 (14/70) is a spectroscopic binary. Miura et al. (1993), using speckle interferometry, estimate the separation between components $\rho<0\hbox{$.\!\!^{\prime\prime}$ }039$ .
HD 208108 (28/35) has also been observed by Ramella et al. (1989) who find $\ensuremath{v\sin i} = 29.0$ $\ensuremath{{\rm km}~{\rm s}^{-1}}$ .

$^\star$ : these stars show very coherent values between both samples, but these low $\ensuremath{v\sin i}$ are considered "discrepant'' with respect to the scaling law (Eq. (8)).

Up: Rotational velocities of A-type stars