Artículo
Abstract:
We study the sodium D lines (D1: 5895.92 Å; D2: 5889.95 Å) in late-type dwarf stars. The stars have spectral types between F6 and M5.5 (B - V between 0.457 and 1.807) and metallicity between and 0.6. We obtained medium-resolution echelle spectra using the 2.15-m telescope at the Argentinian observatory Complejo Astronómico El Leoncito (CASLEO). The observations have been performed periodically since 1999. The spectra were calibrated in wavelength and in flux. A definition of the pseudo-continuum level is found for all our observations. We also define a continuum level for calibration purposes. The equivalent width of the D lines is computed in detail for all our spectra and related to the colour index (B - V) of the stars. When possible, we perform a careful comparison with previous studies. Finally, we construct a spectral index as the ratio between the flux in the D lines and the bolometric flux. We find that, once corrected for the photospheric contribution, this index can be used as a chromospheric activity indicator in stars with a high level of activity. Additionally, we find that combining some of our results, we obtain a method to calibrate in flux stars of unknown colour. © 2007 The Authors. Journal compilation © 2007 RAS.
Registro:
| Documento: | Artículo |
| Título: | The Na i D resonance lines in main-sequence late-type stars |
| Autor: | Díaz, R.F.; Cincunegui, C.; Mauas, P.J.D. |
| Filiación: | Instituto de Astronomía y Física Del Espacio, CC. 67, suc. 28, 1428 Buenos Aires, Argentina |
| Palabras clave: | Stars: activity; Stars: chromospheres; Stars: late-type |
| Año: | 2007 |
| Volumen: | 378 |
| Número: | 3 |
| Página de inicio: | 1007 |
| Página de fin: | 1018 |
| DOI: | http://dx.doi.org/10.1111/j.1365-2966.2007.11833.x |
| Título revista: | Monthly Notices of the Royal Astronomical Society |
| Título revista abreviado: | Mon. Not. R. Astron. Soc. |
| ISSN: | 00358711 |
| CODEN: | MNRAA |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v378_n3_p1007_Diaz |
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Citas:
---------- APA ----------
Díaz, R.F., Cincunegui, C. & Mauas, P.J.D. (2007) . The Na i D resonance lines in main-sequence late-type stars. Monthly Notices of the Royal Astronomical Society, 378(3), 1007-1018.http://dx.doi.org/10.1111/j.1365-2966.2007.11833.x
---------- CHICAGO ----------
Díaz, R.F., Cincunegui, C., Mauas, P.J.D. "The Na i D resonance lines in main-sequence late-type stars" . Monthly Notices of the Royal Astronomical Society 378, no. 3 (2007) : 1007-1018.http://dx.doi.org/10.1111/j.1365-2966.2007.11833.x
---------- MLA ----------
Díaz, R.F., Cincunegui, C., Mauas, P.J.D. "The Na i D resonance lines in main-sequence late-type stars" . Monthly Notices of the Royal Astronomical Society, vol. 378, no. 3, 2007, pp. 1007-1018.http://dx.doi.org/10.1111/j.1365-2966.2007.11833.x
---------- VANCOUVER ----------
Díaz, R.F., Cincunegui, C., Mauas, P.J.D. The Na i D resonance lines in main-sequence late-type stars. Mon. Not. R. Astron. Soc. 2007;378(3):1007-1018.http://dx.doi.org/10.1111/j.1365-2966.2007.11833.x
