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2. Observations

The observations listed in Table 1 (click here) have been obtained with the B&C+CCD spectrograph attached to the 1.82 m telescope operated on Mt. Ekar (Asiago) by the Astronomical Observatory of Padua (Italy). All spectra of programme stars and spectrophotometric standards have been obtained in slitless mode for optimal flux calibration. The observations have been secured during nights with photometric conditions. The covered wavelength range is tex2html_wrap_inline1498. The spectral resolution is dominated by the dimension of the seeing PSF, on the average 20 Å. The Asiago spectra are presented in Figs. 1 (click here) to 5 (click here).

Table 1: Journal of observations of programme stars observed at Asiago. Type, Max and Min as listed by DS93. Code for spectral information available in literature as given by DS93: N = no spectral information; D = only a glass plate tracing or a description of the quiescence spectrum. Status of the object when we have observed it: Q = quiescence; Out = outburst

The objects listed in Table 2 (click here) have been observed with the BFOSC+CCD Imager & Spectrograph attached to the 1.5 m telescope operated in Loiano by the Astronomical Observatory of Bologna (Italy). The slit spectrograph was set to 2 arcsec, for a resolution of 12 Å and a covered wavelength range between 4000 and 7850 Å. In several cases the Loiano observations have been obtained in non-photometric conditions and thus the zero point of the flux scale is not accurate and no absolute fluxes and V magnitude are derived. The Loiano spectra are presented in Figs. 6 (click here) to 10 (click here).

Table 2: Journal of observations of programme stars observed at Loiano. Type, Max and Min as listed by DS93. Code for spectral information available in literature as given by DS93: N = no spectral information; D = only a glass plate tracing or a description of the quiescence spectrum

Table 3: Target objects without recorded spectra because at the time of our observations they were too faint. Type, Max and Min as listed by DS93. The scheme for spectral code (from DS93) is the same as in Table 2 (click here). Last column: magnitude of the object as estimated on the TV screen of the guiding system of the Asiago 1.82 m telescope

Table 4 (click here) gives the classification of the programme stars based on our spectra, Table 5 (click here) the integrated flux of selected emission lines, Table 6 (click here) the continuum fluxes (at the same reference wavelengths as in Papers I, II and III) and Table 7 (click here) the tex2html_wrap_inline1572 magnitudes as derived on our spectra from convolution with the band transmission profiles.

Table 4: Classification from spectra of the programme stars

Table 5: Integrated flux (in units of tex2html_wrap_inline1574) of the most prominent emission lines

Table 6: Continuum fluxes for the programme stars. The fluxes have been scaled to Flux (5200 Å) = 1.00. They were computed averaging over 50 Å\ wide bins centered at the given wavelength

Table 7: B-V, tex2html_wrap_inline1586 colour indices and V magnitude of the programme stars as derived from our spectrophotometry


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