The overcontact binary RZ Tauri

Nelson, Robert H.

doi:10.1016/j.newast.2020.101565

Cited by 8 publications

(5 citation statements)

References 18 publications

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“…The 2013 version of the Wilson-Devinney (WD) code with Kurucz atmospheres (Wilson 1990;Kallrath et al 1998;Nelson 2021) was used to obtain the photometric solution for each system. As all systems show total eclipses accurate photometric solutions are possible and as there was no significant asymmetry at maximum brightness (i.e., no significant O'Connell Effect) only unspotted solutions were obtained.…”

Section: To Determinementioning

confidence: 99%

A Study of Twelve Potential Merger Candidate Contact Binary Systems

Wadhwa

Арбутина

Tothill

et al. 2023

PASP

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Photometric observations and analysis of twelve previously poorly studied contact binary systems is presented. All show total eclipses and have extremely low mass ratios ranging from 0.072 to 0.15. Also, all show characteristics of orbital instability with mass ratios within the theoretical orbital instability range. Although none demonstrate a significant O’Connell effect at least nine of the systems have other indicators of increased chromospheric and magnetic activity.

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Section: To Determinementioning

confidence: 99%

A Study of Twelve Potential Merger Candidate Contact Binary Systems

Wadhwa

Арбутина

Tothill

et al. 2023

PASP

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show abstract

“…As there is no significant asymmetry in the maximum brightness only unspotted solutions were modeled. We used the Wilson-Devinney (WD) code (2013 version) which incorporates Kurucz atmospheres to model simultaneous V and R band light curve solutions (Wilson 1990;Kallrath et al 1998;Nelson 2021). Since the effective temperature of the primary is below 7500 K for each system, the gravity darkening coefficients were set equal g 1 = g 2 = 0.32, and bolometric albedoes as A 1 = A 2 = 0.5. we used the logarithmic limb darkening coefficients from van Hamme (1993) as advocated by Nelson & Robb (2015).…”

Section: Light Curve Analysismentioning

confidence: 99%

A Study of Six Extreme Low Mass Ratio Contact Binary Systems

Wadhwa,

Arbutina,

Petrović

et al. 2023

PASP

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Multi-band (B, V and R) photometric and spectroscopic observations of six poorly studied contact binaries carried out at the Western Sydney University and Las Cumbres Observatory were analyzed using a recent version of the Wilson–Devenney code. All six were found to be of extreme low mass ratio ranging from 0.073 to 0.149. All are of F spectral class with the mass of the primary component ranging from 1.05M ☉ to 1.48M ☉. None show light curve features of enhanced choromospheric activity (O’Connel Effect) however five of the six do have significant ultraviolet excess indicating the presence of increased magnetic and chromospheric activity. Period analysis based on available survey data suggests two systems have a slowly increasing period suggesting mass transfer from the secondary to the primary, two have a slow declining period with likely mass transfer from primary to the secondary, while one shows a steady period, and one undergoing transition from a declining to increasing period suggesting possible mass transfer reversal. We also compare light curve solutions against theoretical markers of orbital stability and show that three of the six systems have mass ratios within the theoretical instability limit and may be regarded as potential merger candidates.

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“…We used the 2009 version of the Wilson-Devinney (WD) light curve code with Kurucz atmospheres (Wilson & Devinney 1971;Wilson 1990;Kallrath et al 1998;Nelson 2021) to analyse the photometric data.…”

Section: Light Curve Analysismentioning

confidence: 99%

“…We relied on the 2009 version of the Wilson-Devinney (WD) light curve code with Kurucz atmospheres (Wilson & Devinney 1971;Wilson 1990;Kallrath et al 1998;Nelson 2021) to analyze the photometric data. Complete eclipses are seen in all systems, making them suitable for light curve analysis and determination of the photometric mass ratio (Terrell & Wilson 2005).…”

Section: Light Curve Analysismentioning

confidence: 99%

Photometric Analysis of Three Potential Red Nova Progenitors

Wadhwa¹,

DeHorta²,

Filipović³

et al. 2022

Res. Astron. Astrophys.

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We present a photometric analysis of three bright red nova progenitor contact binary systems: ASAS J082151-0612.6, TYC 7281-269-1 and TYC 7275-1968-1. The primary components in all three systems are solar-type low mass stars with radii somewhat larger than their Zero Age Main Sequence counterparts. The secondaries, as in most contact binary systems, have radii and luminosities well above their main sequence counterparts. All three have extreme low mass ratios ranging from 0.075 to 0.097 and two have high degrees of contact, in excess of 75%. All three have mass ratios and separations below the theoretical values for orbital stability. Chromospheric activity, a hallmark of magnetic activity and magnetic braking, considered important in mediating angular momentum loss, is also explored. All three systems demonstrate the O’Connell effect, and all systems require the introduction of star spots for a better light curve solution. In addition, we show that ASAS J082151-0612.6 and TYC 7281-269-1 have a a UV colour excess in the range indicating high chromospheric activity. Another measure of potential significant magnetic activity is X-Ray luminosity; TYC 7275-1968-1, and probably also TYC 7281-269-1, have X-Ray luminosity well above other contact binary systems. We conclude that it is likely that all three are unstable and hence are potential merger candidates.

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The overcontact binary RZ Tauri

Cited by 8 publications

References 18 publications

A Study of Twelve Potential Merger Candidate Contact Binary Systems

A Study of Twelve Potential Merger Candidate Contact Binary Systems

A Study of Six Extreme Low Mass Ratio Contact Binary Systems

Photometric Analysis of Three Potential Red Nova Progenitors

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