Anomalous orbital characteristics of the AQ COL (ec 05217–3914) system

dc.contributor.authorOtani, T.
dc.contributor.authorLynas-Gray, A. E.
dc.contributor.authorKilkenny, D.
dc.contributor.authorKoen, C.
dc.contributor.authorVon Hippel, T.
dc.contributor.authorUzundagm.
dc.contributor.authorVučković, M.
dc.contributor.authorPennock, C. M.
dc.contributor.authorSilvotti, R.
dc.date.accessioned2022-11-30T02:46:44Z
dc.date.available2022-11-30T02:46:44Z
dc.date.issued2022
dc.description.abstractAQ Col (EC 05217-3914) is one of the first detected pulsating subdwarf B (sdB) stars and has been considered to be a single star. Photometric monitoring of AQ Col reveals a pulsation timing variation with a period of 486 days, interpreted as time delay due to reflex motion in a wide binary formed with an unseen companion with expected mass larger than 1.05 M⊙. The optical spectra and color–magnitude diagram of the system suggested that the companion is not a main-sequence star but a white dwarf or neutron star. The pulsation timing variation also shows that the system has an eccentricity of 0.424, which is much larger than any known sdB long period binary system. That might be due to the existence of another short period companion to the sdB star. Two optical spectra obtained on 1996 December 5 show a radial velocity change of 49.1 km s−1 in 46.1 minutes, which suggests the hot subdwarf in the wide binary is itself a close binary formed with another unseen white dwarf or neutron star companion; if further observations show this interpretation to be correct, AQ Col is an interesting triple system worthy of further study.en_ES
dc.facultadFacultad de Cienciasen_ES
dc.file.nameOtani_Ano2021.pdf
dc.identifier.citationT. Otani et al 2022 ApJ 926 17en_ES
dc.identifier.doihttps://doi.org/10.3847/1538-4357/ac3a72
dc.identifier.urihttp://repositoriobibliotecas.uv.cl/handle/uvscl/7478
dc.languageen
dc.publisherAmerican Astronomical Society (Aas)
dc.rightsOriginal content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
dc.sourceThe Astrophysical Journal
dc.subjectMULTIPLE STARSen_ES
dc.subjectVARIABLE STARSen_ES
dc.subjectSUBDWARF STARSen_ES
dc.subjectEXTREME HORIZONTAL BRANCH STARSen_ES
dc.subjectSTELLAR EVOLUTIONen_ES
dc.subjectTIMING VARIATION METHODSen_ES
dc.subjectPULSATION FREQUENCY METHODen_ES
dc.subjectWHITE DWARF STARSen_ES
dc.titleAnomalous orbital characteristics of the AQ COL (ec 05217–3914) system
dc.typeArticulo
uv.departamentoInstituto de Fisica y Astronomia

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