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dc.date.accessioned | 2020-04-15T18:49:06Z | |
dc.date.available | 2020-04-15T18:49:06Z | |
dc.date.issued | 2018-01 | |
dc.identifier.uri | http://sedici.unlp.edu.ar/handle/10915/93482 | |
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.extent | 1-11 | es |
dc.language | en | es |
dc.subject | Binaries: eclipsing | es |
dc.subject | Stars: evolution | es |
dc.subject | Stars: individuals (1SWASP J030749.87−365201.7, 1SWASP J213252.93−441822.6, 1SWASP J200059.78+054408.9) | es |
dc.title | Photometric study of three ultrashort-period contact binaries | en |
dc.type | Articulo | es |
sedici.identifier.uri | https://link.springer.com/article/10.1007%2Fs10509-017-3227-4 | es |
sedici.identifier.other | https://doi.org/10.1007/s10509-017-3227-4 | es |
sedici.identifier.other | hdl:11336/39893 | es |
sedici.identifier.issn | 0004-640X | es |
sedici.creator.person | Liu, L. | es |
sedici.creator.person | Qian, S.-B. | es |
sedici.creator.person | Fernández Lajús, Eduardo Eusebio | es |
sedici.creator.person | Essam, A. | es |
sedici.creator.person | El-Sadek, M.A. | es |
sedici.creator.person | Xiong, X. | es |
sedici.subject.materias | Ciencias Astronómicas | es |
sedici.description.fulltext | true | es |
mods.originInfo.place | Instituto de Astrofísica de La Plata | es |
sedici.subtype | Preprint | es |
sedici.rights.license | Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) | |
sedici.rights.uri | http://creativecommons.org/licenses/by-nc-sa/4.0/ | |
sedici.description.peerReview | peer-review | es |
sedici.relation.journalTitle | Astrophysics And Space Science | es |
sedici.relation.journalVolumeAndIssue | vol. 363, no. 1 | es |