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Autor Fernández Figueroa, María José |
Documentos disponibles escritos por este autor (44)
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Cardini, D. ; Cassatella, A. ; Badiali, M. ; Altamore, A. ; Fernández Figueroa, María José | EDP Sciencies | 2003-09We 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 a[...]texto impreso
Barrado y Navascués, D. ; Fernández Figueroa, María José ; Montesinos, B. ; Castro Rubio, Elisa de | EDP Sciencies | 1994-10In this paper we present a study of the evolutionary status of a sample of chromospherically active binary systems for which accurate determinations of their stellar parameters are available. Stellar ages have been obtained by using evolutionary[...]texto impreso
Barrado y Navascués, D. ; Castro Rubio, Elisa de ; Fernández Figueroa, María José ; Cornide Castro-Piñeiro, Manuel ; García López, R. J. | EDP Sciencies | 1998-09-20We present a study of the lithium abundances of a sample of evolved components of Chromospherically Active Binary Systems. We show that a significant part of them have lithium excesses, independently of their mass and evolutionary stage. Therefo[...]texto impreso
Montes Gutiérrez, David ; Fernández Figueroa, María José ; Cornide Castro-Piñeiro, Manuel ; Castro Rubio, Elisa de | EDP Sciencies | 1996-08In this work we analyze the behaviour of the excess Ca II H and K and H_ ? emissions in a sample of 73 chromospherically active binary systems (RS CVn and BY Dra classes), of different activity levels and luminosity classes. This sample includes[...]texto impreso
Montes Gutiérrez, David ; Fernández Figueroa, María José ; Cornide Castro-Piñeiro, Manuel ; Castro Rubio, Elisa de | EDP Sciencies | 1996-08In this work we analyze the behaviour of the excess Ca II H & K and H emissions in a sample of 73 chromospherically active binary systems (RS CVn and BY Dra classes), of diferent activity levels and luminosity classes. This sample includes the [...]texto impreso
We have studied a sample of ten RS CVn systems by means of IUE high resolution long wavelength spectra. A general trend toward decreasing chromospheric activity (R_hk) for slower rotating stars has been found. Considering the R_hk values and the[...]texto impreso
López Santiago, Javier ; Montes Gutiérrez, David ; Crespo Chacón, I. ; Fernández Figueroa, María José | American Astronomical Society | 2006-06-01The latest results in the research of forming planetary systems have led several authors to compile a sample of candidates for searching for planets in the vicinity of the Sun. Young stellar associations are indeed excellent laboratories for thi[...]texto impreso
Rego Fernández, Manuel ; González Riestra, R. ; Fernández Figueroa, María José | EDP Sciencies | 1983The ? 1640 feature has been observed in a sample of late type stars of different luminosity classes. The intensity was measured from IUE low dispersion spectra, and it has been compared with the observed X-ray fluxes, finding a relationship bet[...]texto impreso
Fernández Figueroa, María José ; Castro Rubio, Elisa de ; Rego Fernández, Manuel | EDP Sciencies | 1981Observations of ? Ceti (HD 20630), G5 V, obtained with the IUE satellite have been analysed to determine the structure of its outer atmosphere. This analysis is used to derive a model of transition region and to examine the terms of energy balan[...]texto impreso
Reglero, V. ; Fernández Figueroa, María José ; Giménez, A. ; Castro Rubio, Elisa de ; Fabregat, J. ; Cornide Castro-Piñeiro, Manuel ; Armentia, J. E. | EDP Sciences | 1991-06A detailed study of the system V772 Her = HD 165590 = ADS 11060 AB is presented. The three identified components are found to be late type stars close to the zero-age main sequence with high rotational velocities. Spectroscopic observations allo[...]texto impreso
Montes Gutiérrez, David ; Fernández Figueroa, María José ; Castro Rubio, Elisa de ; Cornide Castro-Piñeiro, Manuel | EDP Sciencies | 1994-05We present measurements of the emission core width W_0 and the wavelength separation of the K_1 dips, W_1, of the Ca II H and K emission lines observed on high-dispersion spectra of 28 chromospherically active binary systems (RS CVn and BY Dra s[...]texto impreso
Giménez, A. ; Ballester, J. L. ; Reglero, V. ; Fernández Figueroa, María José ; Castro Rubio, Elisa de | IOP publishing ltd | 1986-07Simultaneous uvby and H? photometry of thee noneclipsing double-lined spectroscopic binary TZ CrB, an active binary system with almost unevolved components, is presented. A small amplitude distortion wave (0.012 mag in y) has been found with max[...]texto impreso
Giménez, A. ; Reglero, V. ; De Castro, E. ; Fernández Figueroa, María José | EDP Sciencies | 1991-08New photometric observations, using the uvby and H? systems of 72 northern-hemisphere active binaries are discussed in order to explain the main characteristics of their spectral light intensity distribution. Values of the parameter ?m1 range fr[...]texto impreso
Giménez, A. ; Reglero, V. ; Castro Rubio, Elisa de ; Fernández Figueroa, María José | EDP Sciencies | 1991-08New photometric observations, using the uvby and Hß systems of 72 northern-hemisphere active binaries are discussed in order to explain the main characteristics of their spectral light intensity distribution. Values of the parameter ?m_1 range f[...]