The spectroscopic binary system Gl 375 I. Orbital parameters and chromospheric activity

Aims. We study the spectroscopic binary system Gl 375 to characterise its orbit and the spectral types and chromospheric activity levels of the components. Methods. We employed medium-resolution echelle spectra obtained at the 2.15 m telescope at the Argentinian observatory CASLEO and photometric ob...

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Autores principales:	Díaz, R.F., González, J.F., Cincunegui, C., Mauas, P.J.D.
Formato:	JOUR
Materias:	Binaries: spectroscopic Stars: activity Stars: chromospheres Stars: flare Stars: fundamental parameters Stars: late-type Measurement theory Spectroscopic analysis Spectrum analysis Stars Cyclic variation Medium-resolution echelle spectra Tidally synchronised systems Orbits
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00046361_v474_n2_p345_Diaz
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00046361_v474_n2_p345_Diaz
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spelling	todo:paper_00046361_v474_n2_p345_Diaz2023-10-03T14:00:20Z The spectroscopic binary system Gl 375 I. Orbital parameters and chromospheric activity Díaz, R.F. González, J.F. Cincunegui, C. Mauas, P.J.D. Binaries: spectroscopic Stars: activity Stars: chromospheres Stars: flare Stars: fundamental parameters Stars: late-type Measurement theory Spectroscopic analysis Spectrum analysis Stars Cyclic variation Medium-resolution echelle spectra Tidally synchronised systems Orbits Aims. We study the spectroscopic binary system Gl 375 to characterise its orbit and the spectral types and chromospheric activity levels of the components. Methods. We employed medium-resolution echelle spectra obtained at the 2.15 m telescope at the Argentinian observatory CASLEO and photometric observations obtained from the ASAS database. Results. We have separated the composite spectra into those corresponding to both components. The separated spectra allow us to confirm that the spectral types of both components are similar (dMe3.5) and to obtain precise measurements of the orbital period (P = 1.87844 days), minimum masses (M1 sin3 i = 0.35 M ⊙ and M2 sin3 i = 0.33 M ⊙), and other orbital parameters. The photometric observations exhibit a sinusoidal variation with the same period as the orbital period. We interpreted this as signs of active regions carried along with rotation in a tidally synchronised system, and studied the evolution of the amplitude of the modulation on longer timescales. Together with the mean magnitude, the modulation exhibits a roughly cyclic variation with a period of around 800 days. This periodicity is also found in the flux of the Ca II K lines of both components, which seem to be in phase. Conclusions. The periodic changes in the three observables are interpreted as a sign of a stellar activity cycle. Both components appear to be in phase, which implies that they are magnetically connected. The measured cycle of ≈2.2 years (≈800 days) is consistent with previous determinations of activity cycles in similar stars. © ESO 2007. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00046361_v474_n2_p345_Diaz
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: spectroscopic Stars: activity Stars: chromospheres Stars: flare Stars: fundamental parameters Stars: late-type Measurement theory Spectroscopic analysis Spectrum analysis Stars Cyclic variation Medium-resolution echelle spectra Tidally synchronised systems Orbits
spellingShingle	Binaries: spectroscopic Stars: activity Stars: chromospheres Stars: flare Stars: fundamental parameters Stars: late-type Measurement theory Spectroscopic analysis Spectrum analysis Stars Cyclic variation Medium-resolution echelle spectra Tidally synchronised systems Orbits Díaz, R.F. González, J.F. Cincunegui, C. Mauas, P.J.D. The spectroscopic binary system Gl 375 I. Orbital parameters and chromospheric activity
topic_facet	Binaries: spectroscopic Stars: activity Stars: chromospheres Stars: flare Stars: fundamental parameters Stars: late-type Measurement theory Spectroscopic analysis Spectrum analysis Stars Cyclic variation Medium-resolution echelle spectra Tidally synchronised systems Orbits
description	Aims. We study the spectroscopic binary system Gl 375 to characterise its orbit and the spectral types and chromospheric activity levels of the components. Methods. We employed medium-resolution echelle spectra obtained at the 2.15 m telescope at the Argentinian observatory CASLEO and photometric observations obtained from the ASAS database. Results. We have separated the composite spectra into those corresponding to both components. The separated spectra allow us to confirm that the spectral types of both components are similar (dMe3.5) and to obtain precise measurements of the orbital period (P = 1.87844 days), minimum masses (M1 sin3 i = 0.35 M ⊙ and M2 sin3 i = 0.33 M ⊙), and other orbital parameters. The photometric observations exhibit a sinusoidal variation with the same period as the orbital period. We interpreted this as signs of active regions carried along with rotation in a tidally synchronised system, and studied the evolution of the amplitude of the modulation on longer timescales. Together with the mean magnitude, the modulation exhibits a roughly cyclic variation with a period of around 800 days. This periodicity is also found in the flux of the Ca II K lines of both components, which seem to be in phase. Conclusions. The periodic changes in the three observables are interpreted as a sign of a stellar activity cycle. Both components appear to be in phase, which implies that they are magnetically connected. The measured cycle of ≈2.2 years (≈800 days) is consistent with previous determinations of activity cycles in similar stars. © ESO 2007.
format	JOUR
author	Díaz, R.F. González, J.F. Cincunegui, C. Mauas, P.J.D.
author_facet	Díaz, R.F. González, J.F. Cincunegui, C. Mauas, P.J.D.
author_sort	Díaz, R.F.
title	The spectroscopic binary system Gl 375 I. Orbital parameters and chromospheric activity
title_short	The spectroscopic binary system Gl 375 I. Orbital parameters and chromospheric activity
title_full	The spectroscopic binary system Gl 375 I. Orbital parameters and chromospheric activity
title_fullStr	The spectroscopic binary system Gl 375 I. Orbital parameters and chromospheric activity
title_full_unstemmed	The spectroscopic binary system Gl 375 I. Orbital parameters and chromospheric activity
title_sort	spectroscopic binary system gl 375 i. orbital parameters and chromospheric activity
url	http://hdl.handle.net/20.500.12110/paper_00046361_v474_n2_p345_Diaz
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The spectroscopic binary system Gl 375 I. Orbital parameters and chromospheric activity

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