Photometric study of three ultrashort-period contact binaries
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 photometri...
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| Autores principales: | , , , , , |
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| Formato: | Articulo Preprint |
| Lenguaje: | Inglés |
| Publicado: |
2018
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/93482 https://link.springer.com/article/10.1007%2Fs10509-017-3227-4 |
| Aporte de: |
| id |
I19-R120-10915-93482 |
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| 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: eclipsing Stars: evolution Stars: individuals (1SWASP J030749.87−365201.7, 1SWASP J213252.93−441822.6, 1SWASP J200059.78+054408.9) |
| spellingShingle |
Ciencias Astronómicas Binaries: eclipsing Stars: evolution Stars: individuals (1SWASP J030749.87−365201.7, 1SWASP J213252.93−441822.6, 1SWASP J200059.78+054408.9) Liu, L. Qian, S.-B. Fernández Lajús, Eduardo Eusebio Essam, A. El-Sadek, M.A. Xiong, X. Photometric study of three ultrashort-period contact binaries |
| topic_facet |
Ciencias Astronómicas Binaries: eclipsing Stars: evolution Stars: individuals (1SWASP J030749.87−365201.7, 1SWASP J213252.93−441822.6, 1SWASP J200059.78+054408.9) |
| description |
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. |
| format |
Articulo Preprint |
| author |
Liu, L. Qian, S.-B. Fernández Lajús, Eduardo Eusebio Essam, A. El-Sadek, M.A. Xiong, X. |
| author_facet |
Liu, L. Qian, S.-B. Fernández Lajús, Eduardo Eusebio Essam, A. El-Sadek, M.A. Xiong, X. |
| author_sort |
Liu, L. |
| title |
Photometric study of three ultrashort-period contact binaries |
| title_short |
Photometric study of three ultrashort-period contact binaries |
| title_full |
Photometric study of three ultrashort-period contact binaries |
| title_fullStr |
Photometric study of three ultrashort-period contact binaries |
| title_full_unstemmed |
Photometric study of three ultrashort-period contact binaries |
| title_sort |
photometric study of three ultrashort-period contact binaries |
| publishDate |
2018 |
| url |
http://sedici.unlp.edu.ar/handle/10915/93482 https://link.springer.com/article/10.1007%2Fs10509-017-3227-4 |
| work_keys_str_mv |
AT liul photometricstudyofthreeultrashortperiodcontactbinaries AT qiansb photometricstudyofthreeultrashortperiodcontactbinaries AT fernandezlajuseduardoeusebio photometricstudyofthreeultrashortperiodcontactbinaries AT essama photometricstudyofthreeultrashortperiodcontactbinaries AT elsadekma photometricstudyofthreeultrashortperiodcontactbinaries AT xiongx photometricstudyofthreeultrashortperiodcontactbinaries |
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Repositorios |
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