A spectrometer was built to examine the interstellar medium (ISM) using the hydrogen Balmer α line. It is called Dual Etalon Fabry-Perot 150 cm telescope (RTT1
An important paramter in the study of the radial structure of the pulsar radio emission region is the altitude of the emission,but this cannot be derived direct
Supernovae of type Ia (SNe Ia) are confirmed to be the best distance indicators to derive the cosmic expansion rate. The dispersion of their peak lumi nosity at
We find that five sources listed in the new carbon star catalog are not really carbon-rich objects but oxygen-rich stars, because they all have the prominent 10