RW Doradus: a solar-type shallow contact binary with a new orbital period investigation

New CCD photometric light curves of the short-period (P = 0.285 d) eclipsing binary RW Dor are presented. The observations were performed with the PROMPT-8 robotic telescope at CTIO in Chile between 2015 March and 2017 March. Other eclipse timings were obtained from the 2.15 m JS telescope at CASLEO...

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Autores principales:	Sarotsakulchai, Thawicharat, Qian, Sheng-Bang, Soonthornthum, Boonrucksar, Fernández Lajús, Eduardo Eusebio, Liu, Nian Ping, Zhou, Xiao, Zhang, Jia, Liao, Wen-Ping, Reichart, Daniel E., Haislip, Joshua B., Kouprianov, Vladimir, Poshyachinda, Saran
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2019
Materias:	Ciencias Astronómicas Binaries: close Binaries: eclipsing Stars: evolution Stars: individual (RW Doradus)
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/125856
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-125856
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Astronómicas Binaries: close Binaries: eclipsing Stars: evolution Stars: individual (RW Doradus)
spellingShingle	Ciencias Astronómicas Binaries: close Binaries: eclipsing Stars: evolution Stars: individual (RW Doradus) Sarotsakulchai, Thawicharat Qian, Sheng-Bang Soonthornthum, Boonrucksar Fernández Lajús, Eduardo Eusebio Liu, Nian Ping Zhou, Xiao Zhang, Jia Liao, Wen-Ping Reichart, Daniel E. Haislip, Joshua B. Kouprianov, Vladimir Poshyachinda, Saran RW Doradus: a solar-type shallow contact binary with a new orbital period investigation
topic_facet	Ciencias Astronómicas Binaries: close Binaries: eclipsing Stars: evolution Stars: individual (RW Doradus)
description	New CCD photometric light curves of the short-period (P = 0.285 d) eclipsing binary RW Dor are presented. The observations were performed with the PROMPT-8 robotic telescope at CTIO in Chile between 2015 March and 2017 March. Other eclipse timings were obtained from the 2.15 m JS telescope at CASLEO, San Juan, Argentina in 2011 December. Based on a light curve analysis, it is found that RW Dor is a W-type shallow contact binary with a fill-out factor f ∼ 11% and a high mass ratio q ∼ 1.587 (1/q = 0.63), where the hotter component is the less massive one (M₁ ∼ 0.52 M⊙ and M₂ ∼ 0.82 M⊙). For orbital-period investigation, 15 new eclipse times and those previously published were compiled. O − C analysis with very weak evidence suggests that a long-term decrease in period with a rate of dP/dt = −9.61 × 10⁻⁹ d yr⁻¹ is superimposed on a cyclic variation (A₃ = 0.0054 d and P₃ = 49.9 yr). The long-term decrease can be interpreted as mass transfer from the more massive component to the less massive one, or combined with angular momentum loss via magnetic braking. In addition, the marginal contact phase, high mass ratio (1/q >0.4), and long-term decrease in period all suggest that RW Dor is a newly formed contact binary via Case A mass transfer, and it will evolve into a deeper normal contact binary. If the cyclic change is correct, the light travel-time effect via the presence of a cool third body will be a more plausible explanation for this
format	Articulo Articulo
author	Sarotsakulchai, Thawicharat Qian, Sheng-Bang Soonthornthum, Boonrucksar Fernández Lajús, Eduardo Eusebio Liu, Nian Ping Zhou, Xiao Zhang, Jia Liao, Wen-Ping Reichart, Daniel E. Haislip, Joshua B. Kouprianov, Vladimir Poshyachinda, Saran
author_facet	Sarotsakulchai, Thawicharat Qian, Sheng-Bang Soonthornthum, Boonrucksar Fernández Lajús, Eduardo Eusebio Liu, Nian Ping Zhou, Xiao Zhang, Jia Liao, Wen-Ping Reichart, Daniel E. Haislip, Joshua B. Kouprianov, Vladimir Poshyachinda, Saran
author_sort	Sarotsakulchai, Thawicharat
title	RW Doradus: a solar-type shallow contact binary with a new orbital period investigation
title_short	RW Doradus: a solar-type shallow contact binary with a new orbital period investigation
title_full	RW Doradus: a solar-type shallow contact binary with a new orbital period investigation
title_fullStr	RW Doradus: a solar-type shallow contact binary with a new orbital period investigation
title_full_unstemmed	RW Doradus: a solar-type shallow contact binary with a new orbital period investigation
title_sort	rw doradus: a solar-type shallow contact binary with a new orbital period investigation
publishDate	2019
url	http://sedici.unlp.edu.ar/handle/10915/125856
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bdutipo_str	Repositorios
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RW Doradus: a solar-type shallow contact binary with a new orbital period investigation

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