Abstract Details
| Name: SHRUTHI S BHAT Affiliation: CHRIST UNIVERSITY Conference ID: ASI2015_406 Title : Spectroscopic study of Classical Be Stars: 4 Her and 88 Her Authors and Co-Authors : Shruthi S Bhat (Christ University, Bangalore) Dr.Paul.K.T (Christ University, Bangalore) Dr.Annapurni Subramaniam (Indian Institute of Astrophysics, Bangalore) Abstract Type : Poster Abstract Category : Stars, The Milky Way Galaxy and its neighbours Abstract : We present preliminary results of the spectroscopic study of two Be Stars, 4 Her and 88 Her. The time series spectra of these Be stars were obtained using the Universal Astronomical Grating Spectrograph (UAGS) at the Cassegrain focus of the 1 m reflector of Vainu Bappu Observatory, Kavalur, India. We obtained a total of 41 spectra for 4 Her and 32 spectra for 88 Her during April to July 2009, with 1Å resolution at Hα. The spectra were reduced and calibrated using the routines in IRAF. The rotational velocity vsini of the two stars were measured using HeI absorption lines (4026Å and 4471Å). The stars exhibit double peaked Hα profile and is used to estimate the V/R ratio as its variation. Both the stars exhibit spectroscopic variations in the Hα emission line. Short-term cyclic V/R variability within a period of few months for 4 Her is detected. We discuss their circumstellar environments based on the V/R variability. |