Radial Velocity Studies of Close Binary Stars. III (original) (raw)

Radial Velocity Studies of Close Binary Stars. IX

Astronomical Journal, 2004

Methods used in the radial velocity program of short-period binary systems at the David Dunlap Observatory are described with particular stress on the broadening-function formalism. This formalism makes it possible to determine radial velocities from the complex spectra of multiple-component systems with component stars showing very different degrees of rotational line broadening. The statistics of random errors of orbital parameters are discussed on the basis of the available orbital solutions presented in the six previous papers of the series, each with 10 orbits. The difficult matter of systematic uncertainties in orbital parameters is illustrated for the typical case of GM Dra from Paper VI.

Radial Velocity Studies of Close Binary Stars. XII

Astronomical Journal, 2003

Methods used in the radial velocity program of short-period binary systems at the David Dunlap Observatory are described with particular stress on the broadening-function formalism. This formalism makes it possible to determine radial velocities from the complex spectra of multiple-component systems with component stars showing very different degrees of rotational line broadening. The statistics of random errors of orbital parameters are discussed on the basis of the available orbital solutions presented in the six previous papers of the series, each with 10 orbits. The difficult matter of systematic uncertainties in orbital parameters is illustrated for the typical case of GM Dra from Paper VI.

Radial Velocity Studies of Close Binary Stars. X

Astronomical Journal, 2005

Methods used in the radial velocity program of short-period binary systems at the David Dunlap Observatory are described with particular stress on the broadening-function formalism. This formalism makes it possible to determine radial velocities from the complex spectra of multiple-component systems with component stars showing very different degrees of rotational line broadening. The statistics of random errors of orbital parameters are discussed on the basis of the available orbital solutions presented in the six previous papers of the series, each with 10 orbits. The difficult matter of systematic uncertainties in orbital parameters is illustrated for the typical case of GM Dra from Paper VI.

Radial Velocity Studies of Close Binary Stars. XI

Astronomical Journal, 2006

Methods used in the radial velocity program of short-period binary systems at the David Dunlap Observatory are described with particular stress on the broadening-function formalism. This formalism makes it possible to determine radial velocities from the complex spectra of multiple-component systems with component stars showing very different degrees of rotational line broadening. The statistics of random errors of orbital parameters are discussed on the basis of the available orbital solutions presented in the six previous papers of the series, each with 10 orbits. The difficult matter of systematic uncertainties in orbital parameters is illustrated for the typical case of GM Dra from Paper VI.

Radial Velocity Studies of Close Binary Stars.VIII

Astronomical Journal, 2000

Radial-velocity measurements and sine-curve fits to the orbital velocity variations are presented for the eighth set of ten close binary systems: AB And, V402 Aur, V445 Cep, V2082 Cyg, BX Dra, V918 Her, V502 Oph, V1363 Ori, KP Peg, V335 Peg. Half of the systems (V445 Cep, V2082 Cyg, V918 Her, V1363 Ori, V335 Peg) were discovered photometrically by the Hipparcos mission and all systems are double-lined (SB2) contact binaries. The broadening function method permitted improvement of the orbital elements for AB And and V502 Oph. The other systems have been observed for radial velocity variations for the first time; in this group are five bright (V < 7.5) binaries: V445 Cep, V2082 Cyg, V918 Her, KP Peg and V335 Peg. Several of the studied systems are prime candidates for combined light and radial-velocity synthesis solutions.

Radial Velocity Studies of Close Binary Stars. V

The Astronomical Journal, 2001

Radial-velocity measurements and sine-curve fits to the orbital velocity variations are presented for the eighth set of ten close binary systems: AB And, V402 Aur, V445 Cep, V2082 Cyg, BX Dra, V918 Her, V502 Oph, V1363 Ori, KP Peg, V335 Peg. Half of the systems (V445 Cep, V2082 Cyg, V918 Her, V1363 Ori, V335 Peg) were discovered photometrically by the Hipparcos mission and all systems are double-lined (SB2) contact binaries. The broadening function method permitted improvement of the orbital elements for AB And and V502 Oph. The other systems have been observed for radial velocity variations for the first time; in this group are five bright (V < 7.5) binaries: V445 Cep, V2082 Cyg, V918 Her, KP Peg and V335 Peg. Several of the studied systems are prime candidates for combined light and radial-velocity synthesis solutions.

Radial Velocity Studies of Close Binary Stars. VI

Astronomical Journal, 2002

Radial-velocity measurements and sine-curve fits to the orbital velocity variations are presented for the eighth set of ten close binary systems: AB And, V402 Aur, V445 Cep, V2082 Cyg, BX Dra, V918 Her, V502 Oph, V1363 Ori, KP Peg, V335 Peg. Half of the systems (V445 Cep, V2082 Cyg, V918 Her, V1363 Ori, V335 Peg) were discovered photometrically by the Hipparcos mission and all systems are double-lined (SB2) contact binaries. The broadening function method permitted improvement of the orbital elements for AB And and V502 Oph. The other systems have been observed for radial velocity variations for the first time; in this group are five bright (V < 7.5) binaries: V445 Cep, V2082 Cyg, V918 Her, KP Peg and V335 Peg. Several of the studied systems are prime candidates for combined light and radial-velocity synthesis solutions.

Radial Velocity Studies of Close Binary Stars. XIV

The Astronomical Journal, 2009

Radial velocity measurements and sine-curve fits to orbital velocity variations are presented for the ninth set of 10 close binary systems: V395 And, HS Aqr, V449 Aur, FP Boo, SW Lac, KS Peg, IW Per, V592 Per, TU UMi, and 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 semidetached system, FO Vir, at q ¼ 0:125 AE 0:005. The contact binary FP Boo is also a very small mass ratio system, q ¼ 0:106 AE 0:005. The other contact binaries in this group are V592 Per, TU UMi, and the wellknown SW Lac. V592 Per and TU UMi have bright tertiary companions; for these binaries, and for V395 And, we used a novel technique of arranging the broadening functions into a two-dimensional image in phase. The case of TU UMi turned out to be 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, and KS Peg.

RADIAL VELOCITY STUDIES OF CLOSE BINARY STARS. XV

Astronomical Journal, 2009

Radial-velocity measurements and sine-curve fits to the orbital velocity variations are presented for the eighth set of ten close binary systems: AB And, V402 Aur, V445 Cep, V2082 Cyg, BX Dra, V918 Her, V502 Oph, V1363 Ori, KP Peg, V335 Peg. Half of the systems (V445 Cep, V2082 Cyg, V918 Her, V1363 Ori, V335 Peg) were discovered photometrically by the Hipparcos mission and all systems are double-lined (SB2) contact binaries. The broadening function method permitted improvement of the orbital elements for AB And and V502 Oph. The other systems have been observed for radial velocity variations for the first time; in this group are five bright (V < 7.5) binaries: V445 Cep, V2082 Cyg, V918 Her, KP Peg and V335 Peg. Several of the studied systems are prime candidates for combined light and radial-velocity synthesis solutions.