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Abstract:

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.

Registro:

Documento: Artículo
Título:The spectroscopic binary system Gl 375 I. Orbital parameters and chromospheric activity
Autor:Díaz, R.F.; González, J.F.; Cincunegui, C.; Mauas, P.J.D.
Filiación:Instituto de Astronomía y Física del Espacio (IAFE), CC. 67, suc. 28, 1428 Buenos Aires, Argentina
Complejo Astronómico El Leoncito (CASLEO), San Juan, Argentina
Palabras clave: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
Año:2007
Volumen:474
Número:2
Página de inicio:345
Página de fin:353
DOI: http://dx.doi.org/10.1051/0004-6361:20078195
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v474_n2_p345_Diaz

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Citas:

---------- APA ----------
Díaz, R.F., González, J.F., Cincunegui, C. & Mauas, P.J.D. (2007) . The spectroscopic binary system Gl 375 I. Orbital parameters and chromospheric activity. Astronomy and Astrophysics, 474(2), 345-353.
http://dx.doi.org/10.1051/0004-6361:20078195
---------- CHICAGO ----------
Díaz, R.F., González, J.F., Cincunegui, C., Mauas, P.J.D. "The spectroscopic binary system Gl 375 I. Orbital parameters and chromospheric activity" . Astronomy and Astrophysics 474, no. 2 (2007) : 345-353.
http://dx.doi.org/10.1051/0004-6361:20078195
---------- MLA ----------
Díaz, R.F., González, J.F., Cincunegui, C., Mauas, P.J.D. "The spectroscopic binary system Gl 375 I. Orbital parameters and chromospheric activity" . Astronomy and Astrophysics, vol. 474, no. 2, 2007, pp. 345-353.
http://dx.doi.org/10.1051/0004-6361:20078195
---------- VANCOUVER ----------
Díaz, R.F., González, J.F., Cincunegui, C., Mauas, P.J.D. The spectroscopic binary system Gl 375 I. Orbital parameters and chromospheric activity. Astron. Astrophys. 2007;474(2):345-353.
http://dx.doi.org/10.1051/0004-6361:20078195