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Astron. Astrophys. 343, 899-903 (1999)

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4. Spectral classification

Classification-resolution spectra were obtained for both GS-54 and GS-75 with the Gray/Miller spectrograph on the 0.8 m telescope of Appalachian State University on the morning of Feb 1, 1998. A 600g/mm grating was used with a TI 1024 [FORMULA] 1024 thinned CCD to give a resolution of 3.6 Å for 2 pixels and a wavelength coverage of 3800-5600 Å. Both spectra have a S/N [FORMULA]. The spectra were reduced using standard routines under IRAF. The rectified spectra were compared with a library of MK standards obtained with the same system, giving the following classifications: G2mG0IV (GS-54) and K1V (GS-75).

The G2mG0 type indicates that GS-54 is a slightly metal-weak G2 star; it also appears to be slightly evolved. We have attempted to fit a synthetic spectrum (calculated using the spectral synthesis program SPECTRUM - Gray & Corbally (1994), using Kurucz 1993 ATLAS 9 models) to the observed spectrum. Our best fit gives [FORMULA], [FORMULA], [FORMULA] assuming [FORMULA] km s-1 (see Fig. 5).

[FIGURE] Fig. 5. Spectrum of GS-54 and a synthetic spectrum based on an ATLAS 9 Kurucz model atmosphere.

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© European Southern Observatory (ESO) 1999

Online publication: March 1, 1999