All Tables

Table 1: Strömgren photometry of the optical counterpart to 4U 2206+54. The last column indicates the telescope used. a stands for the 1.5-m Spanish telescope at Calar Alto. b represents the 1.23-m German telescope. c is the Skinakas 1.3-m telescope.
Table 2: Measurement of the EW of strong absorption lines (without obvious variability and presumably photospheric) in the spectrum of BD $+53\hbox {$^\circ $ }$ 2790.
Table 4: Summary of the measured rotational velocities for the selected helium lines shown in Fig. 12.
Table 3: Log of spectroscopic observations during 2000.
Table 5: Log of spectroscopic observations. Some representative spectra are displayed in Fig. 2 (marked with *).
Table 6: Observational details, IR photometry.