Differential corrections analysis of the UBV observations of LT Pavonis

The first photoelectric analysis of the W UMa system LT Pav, based on U, B and V light curves, is presented. The light curves are modeled using the Wilson-Devinney approach. Single passband and multi passband solutions made with normal points against those obtained using individual observations are...

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Autor principal: Cerruti, M.A.
Formato: JOUR
Materias:
Binaries
Close - Stars
Eclipsing - Binaries
Individual
LT Pav
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00015237_v45_n2_p399_Cerruti
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00015237_v45_n2_p399_Cerruti
record_format dspace
spelling todo:paper_00015237_v45_n2_p399_Cerruti2023-10-03T13:51:15Z Differential corrections analysis of the UBV observations of LT Pavonis Cerruti, M.A. Binaries Close - Stars Eclipsing - Binaries Individual LT Pav The first photoelectric analysis of the W UMa system LT Pav, based on U, B and V light curves, is presented. The light curves are modeled using the Wilson-Devinney approach. Single passband and multi passband solutions made with normal points against those obtained using individual observations are compared. Solutions were performed keeping the gravity darkening exponent fixed, and the effects of letting it vary with the rest of the main adjustable parameters from a "conservative" converged solution, or from the beginning of the solution are investigated. The main results are that iterations should be continued until all adjustable parameters stabilize, and that a solution can be found starting with normal points and switching afterwards to individual observations without lost of accuracy and reaching convergence in a few iterations. Two final solutions are found. One is characterized mainly by a high g and a low degree of overcontact, the other by the opposite. The primary (more massive) component is in a moderate stage of evolution based in its mean density and color. Preliminary absolute dimensions are derived. The radius of the primary exceeds that of a normal MS star of the same effective temperature by 17% if the temperature correction due to luminosity transfer is considered, and by 30% if the correction is not taken into account. LT Pav would be a W UMa system with the most massive primary known to date, if the absolute dimensions can be confirmed. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00015237_v45_n2_p399_Cerruti
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Binaries
Close - Stars
Eclipsing - Binaries
Individual
LT Pav
spellingShingle Binaries
Close - Stars
Eclipsing - Binaries
Individual
LT Pav
Cerruti, M.A.
Differential corrections analysis of the UBV observations of LT Pavonis
topic_facet Binaries
Close - Stars
Eclipsing - Binaries
Individual
LT Pav
description The first photoelectric analysis of the W UMa system LT Pav, based on U, B and V light curves, is presented. The light curves are modeled using the Wilson-Devinney approach. Single passband and multi passband solutions made with normal points against those obtained using individual observations are compared. Solutions were performed keeping the gravity darkening exponent fixed, and the effects of letting it vary with the rest of the main adjustable parameters from a "conservative" converged solution, or from the beginning of the solution are investigated. The main results are that iterations should be continued until all adjustable parameters stabilize, and that a solution can be found starting with normal points and switching afterwards to individual observations without lost of accuracy and reaching convergence in a few iterations. Two final solutions are found. One is characterized mainly by a high g and a low degree of overcontact, the other by the opposite. The primary (more massive) component is in a moderate stage of evolution based in its mean density and color. Preliminary absolute dimensions are derived. The radius of the primary exceeds that of a normal MS star of the same effective temperature by 17% if the temperature correction due to luminosity transfer is considered, and by 30% if the correction is not taken into account. LT Pav would be a W UMa system with the most massive primary known to date, if the absolute dimensions can be confirmed.
format JOUR
author Cerruti, M.A.
author_facet Cerruti, M.A.
author_sort Cerruti, M.A.
title Differential corrections analysis of the UBV observations of LT Pavonis
title_short Differential corrections analysis of the UBV observations of LT Pavonis
title_full Differential corrections analysis of the UBV observations of LT Pavonis
title_fullStr Differential corrections analysis of the UBV observations of LT Pavonis
title_full_unstemmed Differential corrections analysis of the UBV observations of LT Pavonis
title_sort differential corrections analysis of the ubv observations of lt pavonis
url http://hdl.handle.net/20.500.12110/paper_00015237_v45_n2_p399_Cerruti
work_keys_str_mv AT cerrutima differentialcorrectionsanalysisoftheubvobservationsofltpavonis
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