12 years of stellar activity observations in Argentina

We present an observational program we started in 1999, to systematically obtain mid-resolution spectra of late-type stars, to study in particular chromospheric activity. In particular, we found cyclic activity in four dM stars, including Prox-Cen. We directly derived the conversion factor that tran...

Descripción completa

Guardado en:
Detalles Bibliográficos
Publicado: 2011
Materias:
stars: activity
stars: atmospheres
stars: late-type
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17439213_v7_nS286_p317_Mauas
http://hdl.handle.net/20.500.12110/paper_17439213_v7_nS286_p317_Mauas
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_17439213_v7_nS286_p317_Mauas
record_format dspace
spelling paper:paper_17439213_v7_nS286_p317_Mauas2023-06-08T16:28:07Z 12 years of stellar activity observations in Argentina stars: activity stars: atmospheres stars: late-type We present an observational program we started in 1999, to systematically obtain mid-resolution spectra of late-type stars, to study in particular chromospheric activity. In particular, we found cyclic activity in four dM stars, including Prox-Cen. We directly derived the conversion factor that translates the known S index to flux in the Ca II cores, and extend its calibration to a wider spectral range. We investigated the relation between the activity measurements in the calcium and hydrogen lines, and found that the usual correlation observed is the product of the dependence of each flux on stellar color, and it is not always preserved when simultaneous observations of a particular star are considered. We also used our observations to model the chromospheres of stars of different spectral types and activity levels, and found that the integrated chromospheric radiative losses, normalized to the surface luminosity, show a unique trend for G and K dwarfs when plotted against the S index. © 2012 International Astronomical Union. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17439213_v7_nS286_p317_Mauas http://hdl.handle.net/20.500.12110/paper_17439213_v7_nS286_p317_Mauas
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic stars: activity
stars: atmospheres
stars: late-type
spellingShingle stars: activity
stars: atmospheres
stars: late-type
12 years of stellar activity observations in Argentina
topic_facet stars: activity
stars: atmospheres
stars: late-type
description We present an observational program we started in 1999, to systematically obtain mid-resolution spectra of late-type stars, to study in particular chromospheric activity. In particular, we found cyclic activity in four dM stars, including Prox-Cen. We directly derived the conversion factor that translates the known S index to flux in the Ca II cores, and extend its calibration to a wider spectral range. We investigated the relation between the activity measurements in the calcium and hydrogen lines, and found that the usual correlation observed is the product of the dependence of each flux on stellar color, and it is not always preserved when simultaneous observations of a particular star are considered. We also used our observations to model the chromospheres of stars of different spectral types and activity levels, and found that the integrated chromospheric radiative losses, normalized to the surface luminosity, show a unique trend for G and K dwarfs when plotted against the S index. © 2012 International Astronomical Union.
title 12 years of stellar activity observations in Argentina
title_short 12 years of stellar activity observations in Argentina
title_full 12 years of stellar activity observations in Argentina
title_fullStr 12 years of stellar activity observations in Argentina
title_full_unstemmed 12 years of stellar activity observations in Argentina
title_sort 12 years of stellar activity observations in argentina
publishDate 2011
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17439213_v7_nS286_p317_Mauas
http://hdl.handle.net/20.500.12110/paper_17439213_v7_nS286_p317_Mauas
_version_ 1768544976590864384

Ejemplares similares