The present examination of general relativistic effect on the lag time between continuum and emission line variations in the broad line notes that in the case where the primary source region lies within the range of a strong gravitational field, simultaneity surfaces in the ionized gas are different from those obtained without accounting for the

This atlas shows the locations of and gives information about optical telescopes used for astronomical research in the United States as of late 1986. Those instruments with mirror or lens diameters of 3/4 m (approx. 30 inches) and larger are included. These telescopes are concentrated in the Southwest, on the West Coast and on the island of Hawaii.

A study of the observations made on the development and, in some cases, even the decay of 15 large active regions is presented. It is shown that the mature spots results from the subphotospherically controlled attraction of several large fragments of 1-2 x 10 to the 21st Mx, which are themselves made of smaller elements. The fragments are more

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The question of efficiency of radiative energy losses in spectral lines is addressed. In a semi-infinite atmosphere with constant temperature, the total radiative energy loss (integrated over all depths) in a spectral line without continuum is infinite, in both LTE and non-LTE. Thus, only local energy balances may be considered with such models

High-resolution spectra of Alpha Cen B, Xi Boo A, 70 Oph A, and Epsilon Ind obtained using the Coude Echelle Spectrometer and the 1.4-m Coude Auxiliary Telescope of ESO are analyzed. Variations in the normalized fluxes for the four dwarfs are described. Position and intensity measurements of the Ca II H features are examined. The use of the spectra