2 Observations

The spectroscopic observations of AS314 were obtained at the 6-meter telescope of the Special Astrophysical Observatory (SAO) of the Russian Academy of Sciences on 1997 July 23, 1998 June 16, and 1999 July 1.

The 1997 and 1999 spectra were taken with the CCD equipped échelle-spectrometer LYNX (Panchuk et al. [1999]) mounted at the Nasmyth focus in the spectral ranges from 5370 to 6670 Å and from 5050 to 6635 Å. A $1140 \times 1170$ pixels CCD was employed. The pixel size is $16\times 16\;\mu$m. We used an échelle-grating $\rm 37.5\; gr\,mm^{-1}$ with the blaze angle of 64.3 $\hbox{$^\circ$ }$ and the cross disperser with $\rm 300\; gr\,mm^{-1}$ at first order. These observations were obtained under a poor weather conditions (seeing approximately $3-4\hbox{$^{\prime\prime}$ }$, clouds), therefore the slit size was enlarged to increase the signal-to-noise ratio. The average spectral resolution was equal to 0.35 Å per resolution element ( 0.07- 0.10 Å pre pixel). The 1998 spectrum was obtained at the prime focus with the échelle-spectrometer PFES (Panchuk et al. [1998]) with the same CCD detector in the range from 3998 to 7761 Å. The seeing was nearly 2 $\hbox{$^{\prime\prime}$ }$, while the spectral resolution was about 0.6 Å per resolution element ( 0.14- 0.20 Å pre pixel).

An argon-filled thorium hollow-cathode lamp was used as the source of comparison spectrum. Control and correction of instrumental displacement of the comparison and object spectra were done in using the telluric lines of $\rm O_{2}$ and $\rm H_{2}O$. We tested focusing with the spectra obtained over the observing night using telluric lines and the comparison lamp.

Additionally, 5 UBVRI broad-band observations of AS314 in the Johnson photometric system were obtained at the 1-meter telescope of the Tien-Shan Observatory (Kazakhstan) in August 1995 and August 1998. One JHKLobservation was taken at the 0.75-meter telescope of the South-African Astronomical Observatory on 9 July, 1997 (JD 2450639.49). The optical photometry along with the previously published data are presented in Table 1 with typical errors not exceeding 0.02 mag. The near-IR photometry was obtained for the first time with the following results: $J=7.94 \,\pm\, 0.03$, $H = 7.60 \,\pm\, 0.03$, $K = 7.36 \,\pm\, 0.03$, $L = 6.99 \,\pm\, 0.10$ mag.

Figure 1: Light-curve of AS314 in the V-band from 1979 to 1998. Data from Table 1 are shown by open circles, while the HIPPARCOS data from Table 2 by filled circles