Study on Dynamical Structure of Stellar Atmosphere on the Basis of High Precision Spectroscopy

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To clarify the dynamical structure of stellar atmosphere, it is necessary to measure line profile in stellar spectra with high precision. For this purpose, spectroscopic observations of high quality with high S/N ratio a high spectral resolution should be indispensable. In the present project, we introduce high resolution CCD detector RCA006 with 15 micron pixel size int the PSI CCD V system which is already in use at Okayama Astrophysical Observatory. For this purpose, a new Dewer with improved temperature control is also designed. The system is test and found to be excellent in that expected high resolution has been attained and readout noise turned out to be pretty low. With this new system, astronomical observations at coude focus at Okayama Astrophysical Observatory is done and the performance is found to be fine especially in the near infrared around 8000A. Also, a new software to analyse the CCD spectra has been developed to facilitate the data reduction. It is confirmed that the profile as well as intensity of such strong lines as CaII IR triplet could be measured with high precision and complicated fine structure of the rotational structure of such molecule as TiO could be well resolved. Further analyses on these spectra to clarify the dynamical structure of stellar outer layer are under way.