A photoelectric study of the W UMa-system U Pegasi

Lafta, S. J.; Grainger, J. F.

doi:10.1007/bf00648263

Cited by 11 publications

(2 citation statements)

References 16 publications

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“…After this, some other light curves and/or analyses were given by Demirçan & Güdür (1981), Lafta & Grainer (1985), Demirçan et al (1991Demirçan et al ( & 1996, Essam et al (1992), and more recently by Al-Naimiy & Al-Masharfech (2000). On the other hand, a number of studies about the orbital period variation of the system have been made (e.g.…”

Section: Oo Aqlmentioning

confidence: 98%

Gravity and effective temperature distribution on the surface of contact binary systems

Tsantilas¹,

Rovithis‐Livaniou

2008

Astron Nachr

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The aim of this work is to study the gravity and the effective temperature distribution on the outer equipotential surface of a contact binary. In particular, the lines of constant g, (the iso-g curves), are computed and plotted on the outer surface Cs of contact configurations. Since the gravity distribution would also specify the effective temperature distribution on the binary's common photosphere through the gravity darkening effect, these lines correspond to isothermals too. Applications have been made to two contact binaries; namely, to AW UMa and OO Aql, two systems with very different mass ratios.

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Section: Oo Aqlmentioning

confidence: 98%

Gravity and effective temperature distribution on the surface of contact binary systems

Tsantilas¹,

Rovithis‐Livaniou

2008

Astron Nachr

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“…using the classical Russell model (Binnendijk 1960), Kopal's frequency domain techniques (Lafta et al 1986) or W-D code (Russo et al 1982;Zhai et al 1984;Zhai et al 1988). In the present paper, photoelectric observations (La Fara 1952;Binnendijk 1960;Rigterink 1972;Zhai et al 1984 and …”

Section: Introductionmentioning

confidence: 99%

A photometric study of the W UMa-type system U Pegasi

Djurašević

Rovithis‐Livaniou²,

Rovithis

et al. 2001

A&A

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Abstract. In the present study, the activity of the eclipsing binary of the W UMa-type system U Peg is examined by analysing the photoelectric observations covering the period from 1950 to 1989. During this period, the light curves show significant differences and asymmetries. The analysis of the corresponding light curves is made using Djurašević's inverse problem method. To explain the light-curve asymmetries and variations, we used a Roche model that involved regions containing spots on the components. The analysis shows that the system U Peg is in an overcontact configuration (f over ∼ 14.9%). The Roche model with spotted areas on the cooler component yields a good fit of the observations for the whole set of the analysed light curves without any changes of the basic system parameters. This indicates that the complex nature of the light-curve variations during the examined period can be explained by the evolution and motion of spotted areas on the cooler component. According to the obtained results, the spotted areas cover a significant part of the stellar surface; the changes in their location and size with time are examined.

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An analysis of the light curves of four W UMa-type stars

Lafta

Grainger

1986

Astrophys Space Sci

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A photoelectric study of the W UMa-system U Pegasi

Cited by 11 publications

References 16 publications

Gravity and effective temperature distribution on the surface of contact binary systems

Gravity and effective temperature distribution on the surface of contact binary systems

A photometric study of the W UMa-type system U Pegasi

An analysis of the light curves of four W UMa-type stars

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