Recovering variable stars in large surveys: EA(up) Algol-type class in the Catalina Survey

Autor(es)

Carmo, A. ^[1] ; Lopes, C. E. Ferreira ^[1] ; Papageorgiou, A. ^{[2, 3]} ; Jablonski, F. J. ^[1] ; Rodrigues, V, C. ; Drake, A. J. ^[4] ; Cross, N. J. G. ^[5] ; Catelan, M. ^{[2, 3]}

Afiliação do(s) autor(es)

^[1] V, Inst Nacl Pesquisas Espaciais INPE, Av Astronautas 1758, BR-12227010 Sao Jose Dos Campos, SP - Brazil

^[2] Millennium Inst Astrophys, Santiago - Chile

^[3] Pontificia Univ Catolica Chile, Isnt Astrofis, Fac Fis, Av Vicuna Mackenna 4860, Santiago 7820436 - Chile

^[4] CALTECH, 1200 E Calif Blvd, Pasadena, CA 91125 - USA

^[5] Univ Edinburgh, SUPA Scottish Univ Phys Alliance, Sch Phys & Astron, Wide Field Astron Unit, Inst Astron, Royal Observ, Blackford Hill, Edinburgh EH9 3HJ, Midlothian - Scotland

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 498, n. 2, p. 2833-2844, OCT 2020.
• Citações Web of Science: 0

Resumo

The discovery and characterization of Algol eclipsing binaries (EAs) provide an opportunity to contribute for a better picture of the structure and evolution of low-mass stars. However, the cadence of most current photometric surveys hinders the detection of EAs since the separation between observations is usually larger than the eclipse(s) duration and hence few measurements are found at the eclipses. Even when those objects are detected as variable, their periods can be missed if an appropriate oversampling factor is not used in the search tools. In this paper, we apply this approach to find the periods of stars catalogued in the Catalina Real-Time Transient Survey (CRTS) as EAs having unknown period (EA(up)). As a result, the periods of similar to 56 per cent of them were determined. Eight objects were identified as low-mass binary systems and modelled with the Wilson \& Devinney synthesis code combined with a Markov chain Monte Carlo optimization procedure. The computed masses and radii are in agreement with theoretical models and show no evidence of inflated radii. This paper is the first of a series aiming to identify suspected binary systems in large surveys. (AU)

• Processo FAPESP: 13/26258-4 - Matéria superdensa no universo
• Beneficiário: Manuel Máximo Bastos Malheiro de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Temático