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Luminosity Class of the Symbiotic Stars 4U1954+319 and ZZ CMi

Zamanov, R.; Stoyanov, K. A.; Takey, A. +9 more

We performed optical photometry and spectral observations of the symbiotic stars 4U1954+319 and ZZ CMi. For 4U1954+319, using high-resolution spectra, we, measure the equivalent widths of diffuse interstellar bands (DIBs) and estimate the interstellar reddening E(B−V)=0.83 ± 0.09. Using the GAIA distances and our photometry, we find: (1) the absol…