Abstract
Within the framework of a five-year campaign of coordinated multifrequency observations of the 3 Tauri star RU Lupi, we present results obtained in X-ray, UV, optical, and IR spectral regions. In five cases, simultaneous data from UV to IR were collected. Data analysis shows a large variability at different wavelengths both in the continuum and lines, stronger in the UV and weaker in the IR. Correlations among variations in the UV and optical continua have been found. Moreover flare-like events (FLEs), probably due to strong activity in the surface layers of the star and burst phenomena on large scale, were detected. No forbidden coronal lines were detected in UV and optical regions with IUE and ESO 1.4m CAT telescope, respectively. This means either the used instruments have not enough sensitivity to detect the predicted forbidden lines, or the low X-ray detected intensity — with ASTRON satellite (2–25 keV) — is due to the absorption of the X-rays in the circumstellar envelope. In this paper we will discuss these results within the framework of the current models.
Similar content being viewed by others
References
Bisnovatyi-Kogan, G. S. and Lamzin, S. A.: 1977,Astron. Zh. 74, 1268; or 1978,Soviet Astron. 21, 720.
Calvet, N., Basri, G. and Kuhi, L. V.: 1984,Astrophys. J. 277, 725.
DeCampli, W. M.: 1981,Astron. Astrophys. 244, 124.
Gahm, F. G. and Krautter, J.: 1982,Astron. Astrophys. 106, 25.
Giovannelli, F., Bisnovatyi-Kogan, G. S., Golynskaya, I. M., Kurt, V. G., Lamzin, S. A., Mizyakina, T. A., Shafer, E. Yu., Shamolin, V. M., Sheffer, E. K., Smirnov, A. S., and Vittone, A. A.: 1984, in M. Oda and R. Giacconi (eds.),X-Ray Astronomy 84, Institute of Space and Astronautical Science, p. 77.
Giovannelli, F., Vittone, A. A., Rossi, C., Nastari, I., Bisnovatyi-Kogan, G. S., Golynskaya, I. M., Kurt, V. G., Mizyakina, T. A., Shafer, E. Yu., Shamolin, V. M., Sheffer, E. K., Smirnov, A. S., Lamzin, S. A., Larionov, M. G., and Sidorenko, V. N.: 1986,New Insight in Astrophysics (8 Years of UV Astronomy with IUE), ESA SP-263, p. 95.
Giovannelli, F., Rossi, C., Covino, E., de Martino, D., Errico, L., and Vittone, A. A.: 1987,Mem. Soc. Astron. Ital. 58, 205.
Giovannelli, F., Rossi, C., Covino, E., Errico, L., Vittone, A. A., Bisnovatyi-Kogan, G. S., Kurt, V. G., Sheffer, E. K., and Lamzin, S. A.: 1988,A Decade of UV Astronomy with IUE, ESA SP-281, Vol. 2, p. 101.
Giovannelli, F., Castaldo, D., Covino, E., Vittone, A. A., and Rossi, C.: 1989, in ‘Solar and Stellar Flares, Poster Papers’,IAU Colloq. 104, 139.
Lago, M. T. V. T.: 1979, Ph.D. Thesis of University of Sussex, Brighton, U.K.
Lago, M. T. V. T.: 1982,Monthly Notices Roy. Astron. Soc. 198, 445.
Schwartz, R. D. and Heuermann, R. W.: 1981,Astron. J. 86, 1526.
Author information
Authors and Affiliations
Additional information
Based on observations with IUE satellite (VILSPA) and ESO telescopes.
Rights and permissions
About this article
Cite this article
Giovannelli, F., Rossi, C., Castaldo, D. et al. Multifrequency monitoring of the pre-main-sequence star RU Lupi. Astrophys Space Sci 169, 55–59 (1990). https://doi.org/10.1007/BF00640686
Issue Date:
DOI: https://doi.org/10.1007/BF00640686