NSVS 7051868: A system in a key evolutionary stage. First multi-color photometric study

The first analysis of the light curves of contact binaries ROTSE J135349.8+305205 (CB1) and 1SWASP J150957.5-115308 (CB2) using the Wilson-Devinney code is presented. Both binary systems are of the A-subtype with a shallow fill-out (20.8% and 15.8% respectively) and a difference in temperatures between the components of < 200 K. A mass-ratio of 0.302 is found for CB1, while for CB2 the interesting value of 0.904 is found. The short periods, 0.246 d for CB1 and 0.229 d for CB2, and their spectral type K suggests that these systems are near the shortest period limit. The absolute elements are estimated using GAIA parallaxes. CB2 is found to be at the beginning of its evolution, while CB1 will approach the final evolutionary stage. The sum of the component masses of CB1 is 0.813 M☉, below the mass limit of 1.0 − 1.2 M☉ assumed for the known contact binary stars.

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“…Note that the errors of the parameters given in Table 2 are the formal errors from the W-D code. For a discussion see Barani et al (2017).…”

Section: Photometric Solution With the W-d Methodsmentioning

confidence: 99%

Photometric Analysis of Two K Spectral Type Contact Binary Systems

Barani¹,

Martignoni²,

Acerbi³

et al. 2022

RMxAA

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“…Note that the errors of the parameters given in Table 8 are the formal errors from the W-D code. For a discussion see Barani et al (2017).…”

Section: Analyzing and Modeling The Light Curvesmentioning

confidence: 99%

Absolute parameters of the three totally-eclipsing WUMa stars NSVS 2443858, NSVS 780649 and V1098 Her

Popov

Acerbi²,

Barani³

2021

Res. Astron. Astrophys.

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We present the first photometric analysis of three totally-eclipsing W UMa binaries, NSVS 2443858, NSVS 780649 and V1098 Her. The absolute astrophysical parameters of the stellar components were determined by means of Gaia distances and light curve solutions. The results show that: (i) Two of the systems, NSVS 2443858 and V1098 Her, are of A subtype while the obtained temperature of the secondary component of NSVS 780649 indicates that it is a W-subtype system; (ii) The estimated mass ratios approach the lower limit of the mass ratio assumed by researchers in recent years so our targets could be classified as extreme mass ratio binary (EMRB) systems; (iii) All the systems have deep contact configurations, so they also are deep low mass ratio (DLMR) systems; (iv) The components of our systems are stars of F and G spectral type and undergo total eclipses; (v) The sum 0.871 M ⊙ of the component masses of NSVS 780649 is below the mass limit of 1.0-1.2 M ⊙ assumed for the known contact binary stars.

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“…In this paper we use the output errors from the DC program keeping in mind that the errors here indicated are the formal errors and are unrealistically small; for a discussion see Barani et al (2017).…”

Section: Modelling the Light Curvesmentioning

confidence: 99%

First Photometric Investigation of Two Eclipsing Binary Systems CRTS J213033.6+213159 and 1swasp J212454.61+203030.8

Martignoni¹,

Barani²,

Acerbi³

et al. 2020

RMxAA

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The multicolour CCD light curves of the eclipsing binary systems CRTS J213033.6+213159 and 1SWASP J212454.61+203030.8 are presented for the first time, the observations are analyzed using the latest version of the WilsonDevinney code. Both the systems are found to be W UMa contact binaries belonging two different subtypes. All the light curves show the inverse O'Connell effect. By using our 2 times of minimum light for both the systems and the 187 and 105 ToMs extract from the SWASP observations, respectively for CRTS J213033.6+213159 and for 1SWASP J212454.61+203030.8, the orbital periods are here revised. The spectral type K of the systems and their short orbital periods (< 0.3 days), suggests that they are near the shortest period limit. The absolute dimensions are estimated and, from statistical diagrams, it is found that both components of the systems follow the general pattern of the relative subtype of W Ursae Majoris systems.

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NSVS 7051868: A system in a key evolutionary stage. First multi-color photometric study

Cited by 12 publications

References 24 publications

Photometric Analysis of Two K Spectral Type Contact Binary Systems

Photometric Analysis of Two K Spectral Type Contact Binary Systems

Absolute parameters of the three totally-eclipsing WUMa stars NSVS 2443858, NSVS 780649 and V1098 Her

First Photometric Investigation of Two Eclipsing Binary Systems CRTS J213033.6+213159 and 1swasp J212454.61+203030.8

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