A Spectroscopic and Photometric Study of the Eclipsing System Lambda Tauri.

Abstract

Several spectral lines due to tbe secondary star bave been found. By means of a calibration of equivalen t widtbs of Ca ii K, tbe spectral type (A4 IV) and relative luminosities of tbe eclipsing stars at tbree wave lengtbs are derived. Masses of 6.06 and 1.610 for tbe B3 V and A4 IV stars, respectively, are obtained from tbe Doppler sbifts. Tbe pbotoelectric observations lead to radii of 6.0 and 4.00, respectiveh , and to relative luminosities that are in fair agreement witb the spectroscopic determination. No spectroscopic features could be found wbicb can be attributed to tbe tbird star, nor was it necessary to assume any ligbt from tbe tbird star in the photometric solution.