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A Study of Contact Binaries with Large Temperature Differences between Components

Siwak M., Zola S., Koziel-Wierzbowska D.

Acta Astronomica

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2010

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Vol. 60, No. 4

305--336

EN

We present an extensive analysis of new light and radial velocity (RV) curves, as well as high quality broadening function (BF) profiles of twelve binary systems for which a contact configuration with large temperature differences between components has been reported in the literature. We find that six systems (V1010 Oph, WZ Cyg, VV Cet, DO Cas, FS Lup, V747 Cen) have near contact configurations. For the remaining systems (CX Vir, FT Lup, BV Eri, FO Hya, CN And, BX And), our solutions of the new observations once again converge in a contact configuration with large temperature differences between the components. However, the bright regions discovered in the BFs for V747 Cen, CX Vir, FT Lup, BV Eri, FO Hya, and CN And, and further attributed to hot spots, shed new light on the physical processes taking place between the components and imply the possibility that the contact configurations obtained from light and RV curve modeling are a spurious result.

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Physical Parameters of Components in Close Binary Systems: VI

Gazeas K. D., Niarchos P. G., Zola S., Kreiner J. M., Rucinski S. M.

Acta Astronomica

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2006

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Vol. 56, No. 1

127--143

EN

New high-quality CCD photometric light curves for the W UMa-type systems V410 Aur, CK Boo, FP Boo, V921 Her, ET Leo, XZ Leo, V839 Oph, V2357 Oph, AQ Psc and VY Sex are presented. The new multicolor light curves, combined with the spectroscopic data recently obtained at David Dunlap Observatory, are analyzed with the Wilson-Devinney code to yield the physical parameters (masses, radii and luminosities) of the components. Our models for all ten systems resulted in a contact configuration. Four binaries (V921 Her, XZ Leo, V2357 Oph and VY Sex) have low, while two (V410 Aur and CK Boo) have high fill-out factors. FP Boo, ET Leo, V839 Oph and AQ Psc have medium values of the fill-out factor. Three of the systems (FP Boo, V921 Her and XZ Leo) have very bright primaries as a result of their high temperatures and large radii.

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Physical Parameters of Components in Close Binary Systems. V

Zola S., Kreiner J. M., Zakrzewski B., Kjurkchieva D. P., Marchev D. V., Baran A., Rucinski S. M., Ogloza W., Siwak M., Koziel D., Drozdz M., Pokrzywka B.

Acta Astronomica

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2005

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Vol. 55, No. 4

389--405

EN

The paper presents combined spectroscopic and photometric orbital solutions for ten close binary systems: CN And, V776 Cas, FU Dra, UV Lyn, BB Peg, V592 Per, OU Ser, EQ Tau, HN UMa and HT Vir. The photometric data consist of new multicolor light curves, while the spectroscopy has been recently obtained within the radial velocity program at the David Dunlap Observatory (DDO). Absolute parameters of the components for these binary systems are derived. Our results confirm that CN And is not a contact system. Its configuration is semi-detached with the secondary component filling its Roche lobe. The configuration of nine other systems is contact. Three systems (V776 Cas, V592 Per and OU Ser) have high (44-77%) and six (FU Dra, UV Lyn, BB Peg, EQ Tau, HN UMa and HT Vir) low or intermediate (8-32%) fill-out factors. The absolute physical parameters are derived.

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Physical Parameters of Components in Close Binary Systems: IV

Gazeas K. D., Baran A., Niarchos P., Zola S., Kreiner J. M., Ogloza W., Rucinski S. M., Zakrzewski B., Siwak M., Pigulski A., Dróżdż M.

Acta Astronomica

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2005

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Vol. 55, No. 1

123--140

EN

The paper presents new geometric, photometric and absolute parameters, derived from combined spectroscopic and photometric solutions, for ten contact binary systems. The analysis shows that three systems (EF Boo, GM Dra and SW Lac) are of W-type with shallow to moderate contact. Seven systems (V417 Aql, AH Aur, YY CrB, UX Eri, DZ Psc, GR Vir and NN Vir) are of A-type in a deep contact configuration. For six systems (V417 Aql, YY CrB, GM Dra, UX Eri, SW Lac and GR Vir) a spot model is introduced to explain the O'Connell effect in their light curves. The photometric and geometric elements of the systems are combined with the spectroscopic data taken at David Dunlap Observatory to yield the absolute parameters of the components.

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Physical Parameters of Components in Close Binary Systems: II

Baran A., Zola S., Rucinski S. M., Kreiner J. M., Siwak M., Drozdz M.

Acta Astronomica

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2004

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Vol. 54, No. 2

195--206

EN

We present the absolute parameters of components for five contact binary systems: AB And, GZ And, AO Cam, DN Cam and DK Cyg. The results are based on solutions of new multicolor light curves as well as new radial velocity curves from the DDO radial velocity program. All five systems have a contact configuration with low (5-13%) to intermediate (30-33%) overfilling factors.

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Physical Parameters of Components in Close Binary Systems: III

Zola S., Rucinski S. M., Baran A., Ogloza W., Pych W., Kreiner J. M., Stachowski G., Gazeas K., Niarchos P., Siwak M.

Acta Astronomica

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2004

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Vol. 54, No. 3

299--312

EN

The paper presents combined spectroscopic and photometric orbital solutions for five close binary systems: V402 Aur, SX Crv, V829 Her, VZ Lib and V753 Mon. The photometric data consist of new complete, multicolor light curves, while the spectroscopy has been recently obtained within the radial velocity program at the David Dunlap Observatory. For one target, SX Crv, new spectroscopic data were obtained using the 6.5 m Magellan telescope. A contact configuration was found through light curve modeling for all targets except V753 Mon. Our solution for V753 Mon resulted in a semidetached configuration with the slightly less massive component filling its Roche lobe.