Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989basi...17..107b&link_type=abstract
Astronomical Society of India, Bulletin (ISSN 0304-9523), vol. 17, Sept. 1989, p. 107-113. Research supported by ISRO.
Astronomy and Astrophysics
Astronomy
1
Astronomical Photometry, Emission Spectra, Halley'S Comet, Abundance, Astronomical Observatories, Brightness Distribution, Telescopes
Scientific paper
IHW filter photometry of Comet Halley was carried out on seven nights during pre-perihelion period and on six nights during post-perihelion period, using the 40-cm telescope at the Vainu Bappu Observatory, Kavalur, as a part of the Indian Halley Observation Program. The pre-perihelion observations show large amplitude fluctuations in the emission fluxes, superimposed on the general trend of their slow increase with the decreasing R(h). The respective abundances of the CN, C3, CO(+), C2 and H2O(+) molecules contained in a cylinder of diameter 86 arcsec in the line of sight through the comet have also been estimated. Their individual emission strengths are very low due perhaps to the comet's several approaches to the sun.
Babu S. D. G.
Nathan J. S.
Rajamohan R.
Sivaraman K. R.
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