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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Detalles Bibliográficos
Publicado: 2007
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:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v474_n2_p345_Diaz
http://hdl.handle.net/20.500.12110/paper_00046361_v474_n2_p345_Diaz
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00046361_v474_n2_p345_Diaz
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spelling paper:paper_00046361_v474_n2_p345_Diaz2023-06-08T14:27:45Z The spectroscopic binary system Gl 375 I. Orbital parameters and chromospheric activity 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. 2007 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v474_n2_p345_Diaz 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
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.
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
publishDate 2007
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v474_n2_p345_Diaz
http://hdl.handle.net/20.500.12110/paper_00046361_v474_n2_p345_Diaz
_version_ 1768544390435831808

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