Variation of the Si II features in the chemically peculiar star - HD 115735

S.M.Sriraghavan1;3, K. Jayakumar2, G.S.D. Babu1;2 and S. Sujatha1;4
1M.P.Birla Institute of Fundamental Research, Bangalore - 560001, India.
2Vainu Bappu Observatory, Indian Institute of Astrophysics, Kavalur - 635701, India.
3Florence Pre-University College, Bangalore - 560005, India.
4Mount Carmel College, Bangalore - 560001, India.

Abstract. The chemically peculiar star HD 115735 (= HR 5023 = 21 CVn) was observed with the 2.34 meter Vainu Bappu Telescope at Kavalur during the period of January 1999 to April 2000. A total of 47 spectrograms were obtained in the wavelength region of 3900 º to 4400 º at a resolution of 0.65 per pixel. The equivalent widths of Si II features at 4077, 4128, 4131 have been found to be varying with a period of 0.88 +/- 0.02 day, the amplitudes being about 0.1º. This is the ¯first report of spectroscopic variations of these features in this star.

Keywords: Ap Stars, Spectral features, Equivalent width, Variation Period.

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