Growth of the Centre of Advanced Study in Astronomy at the Osmania University (1997)
After giving a brief historical introduction, the 48-inch telescope project is traced through its different phases of site survey, construction of the dome and installation of the telescope. Then...
Mohan Rao, D., Rangarajan, K. E, Abhyankar, K. D
We consider non-conservative Rayleigh scattering in finite atmospheres and study the polarization in the molecular lines both in the transmitted and reflected sunlight. We first investigate the...
Astronomical significance to two Mohenjodaro seals (1993)
It is shown that the Mohenjodaro Seal No. 420 is a representation of the four constellations corresponding to the four cardinal points of vernal equinox, summer solstice, autumnal equinox and winter...
On the mass-radius relation for neutron stars (1991)
The classical equation of state for a nonrelativistically degenerate gas containing free fermions gives an upper limit to the radius of a neutron star while the Schwarzschild radius gives the lower...
Spectroscopic Orbits of HR:3009 and HR:3335 (1990)
Raghavender Rao, C, Abhyankar, K. D
New spectroscopic orbital elements of two short period doublelined spectroscopic eclipsing binaries HR 3009 and HR 3335 are presented
The long period spectroscopic binary HR 1176 (1989)
Raghavender Rao, C, Abhyankar, K. D
Radial velocity measurements of the long-period spectroscopic binary HR 1176 are obtained from spectrograms made with a 1.22-m telescope at Japal-Rangapur Observatory in India. The spectral line and...
The Moon Illusion and the Height of the Sky (1989)
It is shown that the apparently flattened celestial vault can be represented by a geocentric sphere at a height of 3000-4000 km above the surface of the earth. It is also argued that our eye...
A study of coronal streamers during the total solar eclipse of 1980 February 16 (1988)
Procedure outlined by Saito and Billings has been used for deriving the three dimensional configurations of 17 coronal streamers from the photographs of total solar eclipse of 1980 Feburary 16....
Polarization and electron densities in the solar corona of 1980 February 16 (1986)
Blue and red photographs of the solar corona obtained on February 16, 1980 with the Japal-Rangapur Observatory double polarigraph are analyzed, and calculations for the degree of polarization and the...
Period study of the RS CVn eclipsing binary SV Camelopardalis (1985)
Sarma, C. V. S. R, Sarma, M. B. K, Abhyankar, K. D
Using the available photographic and photoelectric times of minima, we have revised the elements of the light-time orbit of SV Camelopaedalis, an RS CVn type eclpsing binary. Taking a mass function...
On the stability of the hypothetical quintet system of TW Draconis (1985)
Abhyankar, K. D, Bhatia, R. K, Devadas Rao, P
Aarseth`s NBODY 1 code is used to study the stability of the quintet system of DW Draconis postulated by Abhyankar & Panchatsaram (1984). It is found that the observed (O - C) curve based on the...
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...
An explanation for the invoice phase effect for absorption lines formed in a Rayleigh Scattering atmosphere is given in terms of multiple scattering. It is pointed out that the inverse phase effect...
Spectroscopic orbit of R CMa (1984)
Radhakrishnan, K. R, Abhyankar, K. D, Sarma, M. B. K
Spectroscopic observations of the Algol-type binary R CMa during 1980-81 are presented and definitive orbital elements obatined by combining all available measurements of radial velocity. Near...
Period study of the Algol-type eclipsing binary - R Canis Majoris (1984)
Radhakrishnan, K. R, Abhyankar, K. D, Sarma, M. B. K
Photoelectric observations of the Algol-type eclipsing binary R Canis Majoris during three consequtive observing seasons of 1979-82 gave a total of ten primary minima in each of the V and B passbands...
Correction for the observed intensity distribution in solar corona (1984)
Abhyankar, K. D, Subrahmanyam, P. V
An estimation of the correction for the broadening of the intensity profile of the solar corona caused by atmospheric turbulence, scattering in the photographic emulsion, focusing errors etc, is made...
Light-time effect in AK Her and ER Ori (1982)
Abhyankar, K. D, Panchatsaram, T
An analysis of the minimum-time data of AK Her and ER Ori revelas possible sinudodal variations in their orbital periods. In the case of AK Her we suspect two additional components; one of mass 0.2...
Photometric solution for the eclipsing binary TT Aurigae (1982)
Abhyankar, K. D, Rajasekhar Rao, N, Lokanadham, B
Photometric elements of TT Aur are derived from the UBV observations of the star during 1973-77. The system is found to be detached but quite close. Absolute dimensions are obtained on the basis of...
Secular period changes in ten eclipsing binaries (1982)
Panchatsaram, T, Abhyankar, K. D
The photoelectric times of minima, available for the eclipsing binaries KO Aql, V566 Oph, AH Vir, AG Vir, 44i Boo B, RT And , SV Cam, Tv Cas, AT Lac and U Peg have been analysed to study their...
Role of scattering in emergent planetary radiation (1981)
Starting from the basic concepts, the role played by multiple scattering in modifying the intensity and polarization of radiation incident on a planetary atmosphere is brought out. Formation of...
On the orbital periods of the eclipsing binaries CM Lacertae, AB Andromedae and YY Eridani (1981)
Panchatsaram, T, Abhyankar, K. D
A study of all the available photoelectric times of minima of CM Lac, AB And and YY Eri does not reveal any changes in their orbital periods.
SW Lacertae - A quadruple system (1981)
Panchatsaram, T, Abhyankar, K. D
Orbital period study using photoelectric times of minima of SW Lac revelas that the period change is caused by the orbital motion of a triple system around a fourth body. The orbital periods of the...