1. Luminosity class of the symbiotic stars 4U1954+319 and ZZ CMi
- Author
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Zamanov R., Stoyanov K.A., Latev G., Marti J., Takey A., Elhosseiny E.G., Christova M.D., Minev M., Vujčić V., Moyseev M., and Marchev V.
- Subjects
stars: binaries: symbiotic ,stars: individual: 4u1954+319 ,zz cmi ,Astronomy ,QB1-991 - Abstract
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 absolute V -band magnitude MV =-5:23 ± 0:08 of 4U1954+319 and that the mass donor is a supergiant of luminosity class Ib, and (2) MV = -0:27±0:2 for ZZ CMi and that the mass donor is a giant of luminosity class III.
- Published
- 2024
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