Abstract Details
| Name: Kaushal Sharma Affiliation: Department of Physics & Astrophysics, University of Delhi Conference ID: ASI2017_456 Title : Low-resolution spectroscopic investigation of Am stars Authors and Co-Authors : Santosh Joshi(Aryabhatta Research Institute of Observational Sciences, Nainital, India), H. P. Singh(Department of Physics and Astrophysics, University of Delhi, Delhi, India) Abstract Type : Poster Abstract Category : Stars,ISM and the Galaxy Abstract : Nainital-Cape survey, an on-going ground-based asteroseismic project, was initiated in 1999 between ARIES, Nainital India and SAAO, Cape-Town South Africa aiming to search for the photometric pulsational variability in Ap and Am stars in the Northern and Southern hemisphere. In this study, we present the atmospheric parameters (Teff, log g, [Fe/H]) for six Am type stars determined from the low-resolution spectroscopic observations. Spectroscopic analysis is performed using the automatic technique of full spectrum fitting where observed spectrum is compared and minimized with respect to a set of model spectra in order to obtain the best-fitted parameters. For the sample stars, a mean Teff difference of 350+/-150 K is achieved between determined and compiled values from the high-resolution line analysis method. A similar agreement is obtained for logg and [Fe/H]. The consistency reveals that full-spectrum fitting technique might be more useful and less time-consuming in the reliable estimation of parameters of these stars, in particular, Teff, which is crucial for confirming their evolutionary status and explaining the pulsation mechanism. |