Luminosity class of the symbiotic stars 4U1954+319 and ZZ CMi

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 di...

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Bibliographic Details
Published inSerbian astronomical journal. Vol. 2024; no. 208; pp. 41 - 46
Main Authors Zamanov, R., Stoyanov, K.A., Latev, G., Marti, J., Takey, A., Elhosseiny, E.G., Christova, M.D., Minev, M., Vujcic, V., Moyseev, M., Marchev, V.
Format Journal Article
LanguageEnglish
Published Astronomical Observatory of Belgrade 01.01.2024
Astronomical Observatory, Department of Astronomy, Belgrade
Subjects
Astronomy
Spectra
stars: binaries: symbiotic
stars: individual: 4u1954+319
zz cmi
Bulgaria
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Summary: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.
ISSN:1450-698X
1820-9289
DOI:10.2298/SAJ240206002Z