Participants:

D. Barrado y Navascués
Harvard-Smithsonian Center for Astrophysics

M.J. Fernández Figueroa
E. de Castro Rubio
L. Miranda Palacios
M. Cornide Castro-Piñeiro
D. Montes Gutiérrez
Universidad Complutense de Madrid

B. Montesinos Comino
Laboratorio de Astrofísica Espacial y Física Fundamental

Project:

The Infrared Spectrum of Chromospherically Active Stars

PI :

David Barrado y Navascués
Harvard-Smithsonian Center for Astrophysics
USA

Abstract :
We attempt to make high resolution spectroscopic observations of chromospherically active stars. The aim of the project is the confirmation of the presence of photospheric emission lines from Mg I and chromospheric emission lines from H I(7-6), both in the wavelength range around 12 microns. These lines have been observed previously in the Sun. They show a strengthen towards the solar limb and the Mg I lines also show a large Zeeman sensitivity compared with transitions in the optical (5-10 times). These lines should appear enhanced in very active stars. The proposed observations will provide important diagnostics of stellar magnetic fields. We will obtain simultaneous spectra at shorter wavelenghts, for the Pfund(beta), Brackett(alpha) and Brackett(beta) at 4.625, 4.051 and 2.625 microns, respectively, with lower resolution, in order to compare with other chromospheric lines which have been observed previously by us in other spectral ranges.

Allocated time and instruments/detectors Summary :

SWS06 observations still in progress. 8000 seconds out of 16000.

Significant Results :

Observations still in progress.

Updated: Feb 19, 1997.