Radial Velocity Studies of Close Binary Stars.X

Abstract

Radial-velocity measurements and sine-curve fits to the orbital velocity variations are presented for the ninth set of ten close binary systems: V395 And, HS Aqr, V449 Aur, FP Boo, SW Lac, KS Peg, IW Per, V592 Per, TU UMi, FO Vir. The first three are very close, possibly detached, early-type binaries and all three require further investigation. Particularly interesting is V395 And whose spectral type is as early as B7/8 for a 0.685 day orbit binary. KS Peg and IW Per are single-line binaries, with the former probably hosting a very low mass star. We have detected a low-mass secondary in an important semi-detached system FO Vir at q=0.125+/-0.005. The contact binary FP Boo is also a very small mass-ratio system, q=0.106+/-0.005. The other contact binaries in this group are V592 Per, TU UMi and the well known SW Lac. V592 Per and TU UMi have bright tertiary companions; for these binaries, and for V395 And, we used a novel technique of the broadening functions arranged into a 2-dimensional image in phase. The case of TU UMi turned out intractable even using this approach and we have not been able to derive a firm radial velocity orbit for this binary. Three systems of this group were observed spectroscopically before: HS Aqr, SW Lac, KS Peg.

Accepted by AJ, August 2005; 5 figures

References in corpus (11)

• Radial Velocity Studies of Close Binary Stars.VII. Methods and Uncertainties
• Absolute Magnitude Calibration for the W UMa-type Systems Based on Hipparcos Data
• Radial Velocity Studies of Close Binary Stars.I
• Radial Velocity Studies of Close Binary Stars.IV
• Radial Velocity Studies of Close Binary Stars.II
• Radial Velocity Studies of Close Binary Stars.V
• Radial Velocity Studies of Close Binary Stars.VIII
• Radial Velocity Studies of Close Binary Stars.VI
• Radial Velocity Studies of Close Binary Stars.III
• Radial Velocity Studies of Close Binary Stars. IX
• The 7.5 Magnitude Limit Sample of Bright Short-Period Binary Stars. I. How Many Contact Binaries Are There?

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• The VAST Survey -- II. Orbital motion monitoring of A-type star multiples
• Contact Binaries with Additional Components. II. A Spectroscopic Search for Faint Tertiaries
• Contact binaries with additional components. III. The adaptive optics detections
• Photometric study and absolute parameters estimation of six totally eclipsing contact binaries
• Physical parameters of 62 eclipsing binary stars using the ASAS-3 data$-$I
• Radial Velocity Studies of Close Binary Stars. XI
• Radial Velocity Studies of Close Binary Stars.XIII
• Radial velocity mapping of Paczyński's star AW UMa: Not a contact binary
• Starspots in contact and semi-detached binary systems
• Physical parameters of close binary systems: VIII
• Spectroscopic metallicity determinations for W~UMa-type binary stars
• Radial Velocity Studies of Southern Close Binary Stars.I
• Direct Spectral Detection: An Efficient Method to Detect and Characterize Binary Systems
• Photometric and spectroscopic studies of the long period low mass ratio deep contact binary KN Per
• Detection of a cyclic period change in the contact binary TU UMi
• Photospheric silicon abundances of upper main-sequence stars derived from Si II 6347/6371 doublet lines
• Surface Brightness Variation of the Contact Binary SW Lac: Clues From Doppler Imaging
• BVRI Photometric Observations, Light Curve Solutions and Orbital Period Analysis of BF Pav
• Syntriod: A Robust Initial Parameter Estimator for Radial Velocity Curve Solutions Beyond Conventional Sampling Limits