http://hdl.handle.net/2248/270 Search the Channel search http://prints.iiap.res.in/simple-search http://hdl.handle.net/2248/5988 Title: Optical studies of novae<br/><br/>Authors: Anupama, G. C; Kamath, U. S<br/><br/>Abstract: We review the observational characteristics of classical and recurrent novaein the optical region, in the context of observational programmes carried out usingtelescopes at the Vainu Bappu Observatory (VBO) and the Indian Astronomical Observatory(IAO) of the Indian Institute of Astrophysics. The article discusses the di erentclasses of novae, based on either their outburst light curve properties, or their spectraldevelopment. Also provided is a brief discussion on the quiescence properties ofnovae. http://hdl.handle.net/2248/5944 Title: The decameter-wave radio telescope<br/><br/>Authors: Sastry, Ch.V http://hdl.handle.net/2248/5833 Title: Total solar eclipses of 1994 and 1995<br/><br/>Authors: Singh, J<br/><br/>Description: Open Access http://hdl.handle.net/2248/5746 Title: Twin Telescope observations of the Sun at Kodaikanal Observatory<br/><br/>Authors: Singh, J; Ravindra, B<br/><br/>Abstract: We report the design, fabrication and installation of a ‘Twin Telescope’ at Kodaikanal Observatory intended to augment the ongoing synoptic observations of the Sun that have been carried out since 1904. The telescope uses a 15 cm objective capable of taking Ca-K line filtergrams and photoheliograms in continuum of the full disk of the Sun simultaneously, at a frequency of 0.1 Hz using 2kX2k format CCD cameras. The telescope has been in operation since February 2008 and images are being obtained at a cadence of 5 min during normal observing periods. In case of solar activity, images of the active regions can be taken at a frequency of 1 Hz by restricting the field of view and spatial resolution. In this paper, we describe the telescope, instruments, image acquisition, data calibration and image processing. We also discussed a method of determining the network element and plage area index. The preliminary results show that while the network element covers about 30% of the disk, the percentage of the network element area index varies marginally with the seeing conditions during the day.<br/><br/>Description: Open Access