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Дата изменения: Sat Mar 11 12:16:53 2000
Дата индексирования: Sat Sep 11 20:54:44 2010
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Поисковые слова: южная атлантическая аномалия

Observations

Optical spectra of HS 0822+3542 were obtained with the 6m telescope on April 6, 1998 with the spectrograph SP-124 equipped with a Photometrics CCD-detector ( $24\times24\mu$m pixel size) and operating at the Nasmyth-1 focus. The grating B0 with 300 grooves/mm provides dispersion of 4.6 Å pixel^-1and spectral resolution of about 12 Å at first order. A long slit with a size 2$\times$40 was used. The scale along the slit was 04 pixel^-1. The total spectral range covered was $\lambda\lambda$3700-8000 Å.

High S/N ratio long-slit spectroscopy was conducted with the 2.5m Nordic Optical Telescope (NOT) on May 27 and 28, 1998. We used the spectrograph ALFOSC equipped with a Loral (W11-3AC) CCD, with a 13$\times$400 slit, and grisms #6 and #7 (110 Å/mm), which provide a spectral dispersion of 1.5 Å pixel^-1and a resolution of about 8 Å (FWHM). The spectral range was $\lambda\lambda$3200-5500 Å for grism #6 and $\lambda\lambda$3800-6800 Å for grism #7. The spatial resolution was of 0189 per pixel. The total exposure time for grism #6 was 60 min, split into three 20 min exposures, and 40 min for grism #7, split into two 20 min exposures. The slit, centred on the brightest knot (see in Fig. 1 the R-band image of the galaxy), was oriented in the N-S direction. Spectra of He-Ne comparison lamp were obtained after each exposure for wavelength calibration, and three spectrophotometric standard stars Feige 34, HZ 44 and , were observed for flux calibration. The seeing during the spectral observations was $\approx$ 08.