Spectral types are assigned to 13 'unidentified' Equatorial Infrared Catalogue 1 (EIC-1) sources from a study of their spectra in the wavelength interval 5200-8700 A. Their spectral types range from M4.5 to M6.5. We infer ...

Association of coronal holes with long-lived unipolar magnetic regions (LLUMRs) which survived for four solar rotations is examined. It is noticed that every coronal hole fits in well within the LLUMR. The coronal holes ...

The Doppler widths of 0-1, 1-2 and 2-3 vibrational bands of the violet system of CN molecule in the solar atmosphere increase linearly with equivalent width upto approximately equal to 20 mA

H- and auxiliary functions are tabulated for nonconservative scattering for phase functions of type p (Cos teta) = omega/sub0/ + omega/sub1/P/sub1/ (Cos teta) + omega/sub2/P/sub2/ X (Cos teta). They have been computed for ...

We report here the H-alpha observations of a large and complicated flare of optical class 2B which occured on 1982 April 14. The flare showed significant activity for several minutes prior to its impulsive phas, as evidenced ...

We describe time-lapse H-alpha observations of a peculiar type of prominence activation of 1981 October 7 and and its morphological behaviour. The prominence material seems to have originated from the photosphere as a huge ...

Twelve photoelectric light curves of six eclipsing binary stars namely GG Cas, WX Cep, UZ Cyg, AQ Peg and ST Per in two different filetrs (B and V for the first five binaries and R and I for ST Per) have been analysed by ...

Centre-to-limb variation of the rotational temperature of the fundamental band of SiO in different sunspot models has been calculated. The possibility of using these calculations to pick up the true model on the basis of ...