Publication: A study of the Mg II 2796.34 angstrom emission line in late-type normal and RS CVn stars
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2003-09
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Abstract
We carry out an analysis of the Mg II 2796.34 Å emission line in RS CVn stars and make a comparison with the normal stars studied in a previous paper ( Paper I). The sample of RS CVn stars consists of 34 objects with known HIPPARCOS parallaxes and observed at high resolution with IUE. We confirm that RS CVn stars tend to possess wider Mg II. lines than normal stars having the same absolute visual magnitude. However, we could not find any correlation between the logarithmic line width log W_o and the absolute visual magnitude M_v (the Wilson-Bappu relationship) for these active stars, contrary to the case of normal stars addressed in Paper I. On the contrary, we find that a strong correlation exists in the (M_v, log L_MgII) plane (L_MgII is the absolute flux in the line). In this plane, normal and RS CVn stars are distributed along two nearly parallel straight lines with RS CVn stars being systematically brighter by ≈1 dex. Such a diagram provides an interesting tool to discriminate active from normal stars. We finally analyse the distribution of RS CVn and of normal stars in the (log L_MgII, log W_o) plane, and find a strong linear correlation for normal stars, which can be used for distance determinations.
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© ESO 2003. The authors are grateful to Prof. J. Linsky for
stimulating suggestions and to Dr. D. Marinucci for useful comments.
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Barylak, M., Wasatonic, R., & Imhoff, C. L. 1985, NASA IUE
Newslett., 26, 101
Bopp, B. W., & Stencel, R. E. 1981, AJ, 247, 131
Cassatella, A., Altamore, A., González Riestra, R., et al. 2000, A&AS, 141, 331
Basri, G. 1987, ApJ, 316, 377
Cassatella, A., Altamore, A., Badiali, M., & Cardini, D. 2001, A&A, 374, 1085
Cerruti Sola, M., Cheng, C.-C., & Pallavicini, R. 1992, A&A, 256, 185
Cornide, M., Fernández Figueroa, M. J., De Castro, E., & Armentia, J. 1992, AJ, 103, 1374
Cutispoto, G., Pagano, I., & Rodon´o, M. 1992, A&A, 263, L3
Elgarøy, Ø., Engvold, O., & Lund, N. 1999, A&A, 343, 222
Elgarøy, Ø., Engvold, O., & Jorås, P. 1997, A&A, 326, 165
ESA 1997, The Hypparcos and Tycho Catalogues, ESA SP-1200
Evans, N. R., & Imhoff, C. L. 1985, NASA IUE Newslett., 28, 77
Fekel, F. C., Moffet, T. J., & Henry, G. W. 1986, ApJS, 60, 551
Fekel, F. C., Strassmeier, K. G., Weber, M., & Washúttl, A. 1999, A&AS, 137, 369
Fernández Figueroa, M. J., Montes, D., De Castro, E., & Cornide, M. 1994, ApJS, 90, 433
Fernández Figueroa, M. J., Montesinos, B., De Castro, E., et al. 1986, A&A, 169, 219
Fernie, J. D. 1999, IBVS, 4473
Fireman, G. F., & Imhoff, C. L. 1989, NASA IUE Newslett., 40, 10
García Alegre, M. C., Ponz, J. D., & Vásquez, M. 1981, A&A, 96, 17
Gayley, K. G. 2002, ApJ, 565, 545
Gunn, A. G., Mitrou, C. K., & Doyle, J. G. 1998, MNRAS, 296, 150
González Riestra, R., Cassatella, A., Solano, E., Altamore, A., & Wamsteker, W. 2000, A&AS, 141, 343
González Riestra, R., Cassatella, A., & Wamsteker, W. 2001, A&A, 373, 730
Imhoff, C. L., & Wasatonic, R. 1986, NASA IUE Newslett., 29, 45
Linsky, J. L. 1999, ApJ, 525, 776
McClintock, W., Linsky, J. L., Henry, R. C., & Moos, H. W. 1975, ApJ, 202, 733
Montes, D., Fernández Figueroa, M. J., De Castro, E., & Cornide, M. 1994, A&A, 285, 609
Montes, D., Fernández Figueroa, M. J., De Castro, E., & Cornide, M. 1995a, A&AS, 109, 135
Montes, D., De Castro, E., Fernández Figueroa, M. J., & Cornide, M. 1995b, A&AS, 114, 287
Montes, D., Sanz Forcada, J., Fernández Figueroa, M. J, & Lorente, R. 1996, A&A, 310, L27
Montes, D., Fernández Figueroa, M. J., De Castro, E., & Sanz Forcada, J. 1997, A&AS, 125, 263
Montes, D., Fernández Figueroa, M. J., De Castro, E., et al. 2000, A&A, 146, 103
Montes, D., López Santiago, J., Fernández Figueroa, M. J., & Gálvez, M. C. 2001, A&A, 379, 976
Montesinos, B., Giménez, A., & Fernández Figueroa, M. J. 1994, MNRAS, 232, 361
Özeren, F. F., Doyle, J. G., & Jevremovic, D. 1999, A&A, 350, 635
Pagano, I., Rodonó, M., Linsky, J. L., et al. 2001, A&A, 365, 128
Pérez, M., & Loomis, C. 1991, Report to the Three Agency Meeting, F-13
Pérez, M. 1992, NASA IUE Newslett., 48, 76
Scoville, F., & Mena-Werth, J. 1998, PASP, 110, 794
Strassmeier, K. G., Rice, C. B., Fekel, F. C., & Scheck, M. 1993, A&AS, 100, 173
Vladilo, G., Molaro, P., Crivellari, L., et al. 1987, A&A, 185, 233
Wallerstein, G., Machado Peláez, L., & González, G. 1999, PASP, 111, 335
Weiler, E. J., & Oegerle, W. R. 1979, ApJS, 39, 537
Wilson, O. C., & Bappu, M. K. V. 1957, ApJ, 125, 661