Luminosity class of the symbiotic stars 4U1954+319 and ZZ CMi
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Published:2024
Issue:208
Volume:
Page:41-46
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ISSN:1450-698X
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Container-title:Serbian Astronomical Journal
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language:en
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Short-container-title:Serb Astron J
Author:
Zamanov R.1, Stoyanov K.A.1, Latev G.1, Marti J.2, Takey A.3, Elhosseiny E.G.3, Christova M.D.4, Minev M.1, Vujcic V.5ORCID, Moyseev M.1, Marchev V.1
Affiliation:
1. Institute of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences, Sofia, Bulgaria 2. Departamento de Física, Escuela Politécnica Superior de Jaén, Universidad de Jaén, Campus Las Lagunillas, Jaén, Spain 3. National Research Institute of Astronomy and Geophysics (NRIAG), Helwan, Cairo, Egypt 4. Department of Applied Physics, Technical University of Sofia, Sofia, Bulgaria 5. Astronomical Observatory, Belgrade, Serbia
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.
Funder
Ministry of Education, Science and Technological Development of the Republic of Serbia
Publisher
National Library of Serbia
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