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12 years of stellar activity observations in Argentina

Published online by Cambridge University Press:  05 July 2012

P. J. D. Mauas ,
A. Buccino ,
R. Díaz ,
M. Vieytes ,
R. Petrucci ,
E. Jofre ,
X. Abrevaya ,
M. L. Luoni  and
P. Valenzuela
P. J. D. Mauas
Affiliation:
Instituto de Astronomía y Física del Espacio, C.C. 67 - Suc. 28, 1428, Buenos Aires, Argentina email: [email protected]
A. Buccino
Affiliation:
Instituto de Astronomía y Física del Espacio, C.C. 67 - Suc. 28, 1428, Buenos Aires, Argentina email: [email protected]
R. Díaz
Affiliation:
Institut d'Astrophysique de Paris, CNRS/UPMC, Paris, France. Observatoire de Haute-Provence, CNRS/OAMP, Saint-Michel l'Observatoire, France.
M. Vieytes
Affiliation:
Instituto de Astronomía y Física del Espacio, C.C. 67 - Suc. 28, 1428, Buenos Aires, Argentina email: [email protected]
R. Petrucci
Affiliation:
Instituto de Astronomía y Física del Espacio, C.C. 67 - Suc. 28, 1428, Buenos Aires, Argentina email: [email protected]
E. Jofre
Affiliation:
Observatorio Astronómico de Córdoba, Argentina
X. Abrevaya
Affiliation:
Instituto de Astronomía y Física del Espacio, C.C. 67 - Suc. 28, 1428, Buenos Aires, Argentina email: [email protected]
M. L. Luoni
Affiliation:
Instituto de Astronomía y Física del Espacio, C.C. 67 - Suc. 28, 1428, Buenos Aires, Argentina email: [email protected]
P. Valenzuela
Affiliation:
Instituto de Astronomía y Física del Espacio, C.C. 67 - Suc. 28, 1428, Buenos Aires, Argentina email: [email protected]
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Abstract

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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.

Keywords

stars: activitystars: late-typestars: atmospheres
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S286: Comparative Magnetic Minima: Characterizing quiet times in the Sun and Stars , October 2011 , pp. 317 - 323
Copyright
Copyright © International Astronomical Union 2012

References

Buccino, A. P., Díaz, R. F., Luoni, M. L., Abrevaya, X. C., & Mauas, P. J. D. 2011, AJ 141, 34CrossRefGoogle Scholar
Buccino, A. P. & Mauas, P. J. D.. 2008, A&A 483, 903Google Scholar
Buccino, A. P. & Mauas, P. J. D.. 2009, A&A 495, 287Google Scholar
Chabrier, G. & Küker, M. 2006, A&A 446, 1027Google Scholar
Cincunegui, C. C. & Mauas, P. J. D.. 2004, A&A, 414, 699Google Scholar
Cincunegui, C. C., Díaz, R., & Mauas, P. J. D. 2007a, A&A, 469, 309Google Scholar
Cincunegui, C. C., Díaz, R., & Mauas, P. J. D. 2007b, A&A, 461, 1107Google Scholar
Díaz, R., Cincunegui, C. C., & Mauas, P. J. D. 2007, MNRAS, 378, 1007CrossRefGoogle Scholar
Díaz, R., González, F., Cincunegui, C. C., & Mauas, P. J. D. 2007, A&A, 474, 345Google Scholar
Gray, D. F., Baliunas, S. L., Lockwood, G. W., & Skiff, B. A. 1996, ApJ, 465, 945CrossRefGoogle Scholar
Mauas, P. J. D. & Falchi, A. 1994, A&A 281, 129Google Scholar
Mauas, P. J. D. & Falchi, A. 1996, A&A, 310, 245Google Scholar
Mauas, P. J. D., Falchi, A., Pasquini, L., & Pallavicini, R. 1997, A&A 326, 249Google Scholar
Middelkoop, F. 1982, A&A 107, 31Google Scholar
Noyes, R. W., Hartmann, L. W., Baliunas, S. L., Duncan, D. K., & Vaughan, A. H. 1984, ApJ 279, 763CrossRefGoogle Scholar
Pojmanski, G. 2002, Acta Astron. 52, 397Google Scholar
Rutten, R. G. M. 1984, A&A 130, 353Google Scholar
Vaughan, A. H., Preston, G. W., & Wilson, O. C. 1978, PASP 90, 267CrossRefGoogle Scholar
Vieytes, M.; Mauas, P. J. D., & Cincunegui, C. C. 2005, A&A 441, 701Google Scholar
Vieytes, M., Díaz, R., & Mauas, P. J. D.. 2009, MNRAS 398, 1495.CrossRefGoogle Scholar