Bulgarian Prosecutor`s Office – Protection Activities to the Prosecutor General

Терзиев, Венелин; Georgiev, Мarin; Bankov, Stefcho; Ivanov, Ivan

doi:10.2139/ssrn.3840256

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“…The data for V503 Her do not indicate the presence of short-term flickering-like variability with a larger amplitude than the noise that affects nearby stars. However, one should still keep in mind that even in the case of well-known accreting-only symbiotic stars (e.g., SU Lyn, MWC 560, or RT Cru), flickering is not detectable at all epochs (e.g., Lucy et al 2020;Munari et al 2021;Georgiev et al 2022;Zamanov et al 2023;Pujol et al 2023), so the non-detection of flickering does not reject the accretion-only symbiotic nature of V503 Her.…”

Section: Symbiotic Classificationmentioning

confidence: 99%

Comprehensive Analysis of a Symbiotic Candidate V503 Her

Merc

Gális

Wolf

et al. 2023

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V503 Her was previously proposed as an eclipsing symbiotic candidate based on photometric behavior and spectroscopic appearance indicating the composite optical spectrum. To investigate its nature, we analyzed long-term photometric observations covering 100 yr of its photometric history and new low-resolution optical spectroscopic data, supplemented with the multifrequency measurements collected from several surveys and satellites. Based on the analysis presented in this paper, we claim that V503 Her is not an eclipsing binary star. The optical and infrared wavelengths are dominated by a K-type bright giant with an effective temperature of 4500 K, luminosity of 1900 L ⊙, and subsolar metallicity on the asymptotic giant branch showing semiregular complex multiperiodic pulsation behavior. V503 Her does not show the characteristics of strongly interacting symbiotic variables, but some pieces of evidence suggest that it could still be one of the “hidden” accreting-only symbiotic systems. However, the currently available data do not allow us to fully confirm or constrain the parameters of a possible companion.

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