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dc.contributor.author
Liu, L.
dc.contributor.author
Qian, S. B.
dc.contributor.author
Fernandez Lajus, Eduardo Eusebio
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dc.contributor.author
Essam, A.
dc.contributor.author
El Sadek, M. A.
dc.contributor.author
Xiong, X.
dc.date.available
2018-03-26T15:02:30Z
dc.date.issued
2018-01
dc.identifier.citation
Liu, L.; Qian, S. B.; Fernandez Lajus, Eduardo Eusebio; Essam, A.; El Sadek, M. A.; et al.; Photometric study of three ultrashort-period contact binaries; Springer; Astrophysics And Space Science; 363; 1; 1-2018; 1-20
dc.identifier.issn
0004-640X
dc.identifier.uri
http://hdl.handle.net/11336/39893
dc.description.abstract
We carried out high-precision photometric observations of three eclipsing ultrashort-period contact binaries (USPCBs). Theoretical models were fitted to the light curves by means of the Wilson-Devinney code. The solutions suggest that the three targets have evolved to a contact phase. The photometric results are as follows: (a) 1SWASP J030749.87−365201.7, q= 0.439 ± 0.003 , f= 0.0 ± 3.6 % ; (b) 1SWASP J213252.93−441822.6, q= 0.560 ± 0.003 , f= 14.2 ± 1.9 % ; (c) 1SWASP J200059.78+054408.9, q= 0.436 ± 0.008 , f= 58.4 ± 1.8 %. The light curves show O’Connell effects, which can be modeled by the assumed cool spots. The cool spots models are strongly supported by the night-to-night variations in the I-band light curves of 1SWASP J030749.87−365201.7. For a comparative study, we collected the whole set of 28 well-studied USPCBs with P< 0.24 day. Thus, we found that most of them (17 of 28) are in shallow contact (i.e. fill-out factors f< 20 %). Only four USPCBs have deep fill-out factors (i.e. f> 50 %). Generally, contact binaries with deep fill-out factors are going to merge, but it is believed that USPCBs have just evolved to a contact phase. Hence, the deep USPCB 1SWASP J200059.78+054408.9 seems to be a contradiction, making it very interesting. Particularly, 1SWASP J030749.87−365201.7 is a zero contact binary in thermal equilibrium, implying that it should be a turn-off sample as predicted by the thermal relaxation oscillation (TRO) theory.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Springer
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
BINARIES: ECLIPSING
dc.subject
STARS: EVOLUTION
dc.subject
STARS: INDIVIDUALS (1SWASP J030749.87−365201.7, 1SWASP J213252.93−441822.6, 1SWASP J200059.78+054408.9)
dc.subject.classification
Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Photometric study of three ultrashort-period contact binaries
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-03-26T14:39:28Z
dc.journal.volume
363
dc.journal.number
1
dc.journal.pagination
1-20
dc.journal.pais
Alemania
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dc.journal.ciudad
Berlin
dc.description.fil
Fil: Liu, L.. Chinese Academy of Sciences; República de China
dc.description.fil
Fil: Qian, S. B.. Chinese Academy of Sciences; República de China
dc.description.fil
Fil: Fernandez Lajus, Eduardo Eusebio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
dc.description.fil
Fil: Essam, A.. National Research Institute of Astronomy and Geophysics; Egipto
dc.description.fil
Fil: El Sadek, M. A.. National Research Institute of Astronomy and Geophysics; Egipto
dc.description.fil
Fil: Xiong, X.. Chinese Academy of Sciences; República de China
dc.journal.title
Astrophysics And Space Science
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1007/s10509-017-3227-4
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs10509-017-3227-4
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