摘 要: | By using 2.16 m telescope at Xinglong Station, the high S/N H_α line spectroscopy was carried out for HR 1099 with the French ISIS spectrograph from January 12 to 19 in 1993. The spectrum covers a wavelengh region from 6544.7 to 6579.5 A with a reciprocal linear dispersion of about 2.52 A/mm. The exposure time for HR 1099 was 40 minutes for each. A total of 18 spectra (Figure 1) were secured within two and half adjacent orbital cy-
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