LAMOST J202629.80+423652.0 is not a symbiotic star

Andreoli, V.; Munari, U.

doi:10.31577/caosp.2020.50.3.672

Cited by 2 publications

(2 citation statements)

References 14 publications

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“…Absolute flux calibration of the comet images was carried out by measuring field stars. For this, we used the catalogs UCAC4 (Zacharias et al 2013) and APASS (Henden & Munari 2014). The observations were carried out in conditions with good seeing, of namely ∼1.5 ′′ .…”

Section: M Rcc Telescopementioning

confidence: 99%

Quasi-simultaneous photometric, polarimetric, and spectral observations of distant comet C/2014 B1 (Schwartz)

Ivanova

Rosenbush

Luk'yanyk

et al. 2023

A&A

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Context. We analyze the results of our comprehensive observations of the high-perihelion comet C/2014 B1 (Schwartz) with stable disk-shaped coma and jets in order to study its nature. Aims. The main objective of our study is to obtain new observational results for a unique disk-like comet C/2014 B1 (Schwartz) with a perihelion distance of 9.56 au. Methods. Quasi-simultaneous long-slit spectra, as well as photometric and polarimetric images with g-sdss and r-sdss filters, were acquired with the 6 m telescope of the Special Astrophysical Observatory on 2017 January 23. The BVR-band photometry of the comet was also performed at the 2m telescope of the Peak Terskol Observatory on 2017 January 31. We modeled the dynamics of the jets and the behavior of the color and polarization in the coma considering the dust as aggregated large particles. Results. We did not reveal any emissions in the spectra. The positions of two jets oriented along the position angles of 179° and 350° and the disk-like shape of the coma have remained unchanged for more than 4 yr. The most realistic model able to explain jets of such stable orientation includes the existence of two active sources located near the north and south poles of the rotating nucleus whose diameter was determined to be between 7.6 and 12.2 km depending on the albedo, of namely between 0.1 and 0.04, respectively. The high activity of the comet is characterized by the high dust production Afρ which varied from 4440 to 3357 cm between 2017 January 23 and 31. A significant difference between the radial surface brightness profiles of the jets and the ambient (undisturbed by the jets) coma is found. The color of the jet structures is much redder than that of the ambient coma, and the nucleus has a very red color, V − R=0.93m±0.19m. There are spatial variations of the color and polarization over the coma and jets. Conclusions. The observed trends in color and polarization, as well as the brightness profiles, can be explained by the fragmentation of aggregated particles formed by CO2/H2O ices, silicates, and organics, which are of ~1 mm in radius near the nucleus and ~10 μm in radius at the periphery of the coma.

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Section: M Rcc Telescopementioning

confidence: 99%

Quasi-simultaneous photometric, polarimetric, and spectral observations of distant comet C/2014 B1 (Schwartz)

Ivanova

Rosenbush

Luk'yanyk

et al. 2023

A&A

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“…In recent years, several surveys have focused on discovering new symbiotic stars, both in the Milky Way (e.g., Corradi et al 2008Corradi et al , 2010Kniazev et al 2009;Miszalski et al 2013;Miszalski & Mikołajewska 2014;Rodríguez-Flores et al 2014;Akras et al 2021;Munari et al 2021;Akras 2023) and in the Local Group (e.g., Gonçalves et al 2008;Mikołajewska et al 2014Mikołajewska et al , 2017Gonçalves et al 2015;Ilkiewicz et al 2018;Saeedi et al 2019). However, many of the candidates accumulated over the years have only been very poorly studied, and several are in fact included in this category of objects incorrectly (see, e.g., the case of LAMOST J202629.80 +423652.0 in Andreoli & Munari 2020). Based on our New Online Database of Symbiotic Variables (Merc et al 2019), we have initiated an observational campaign to analyze some of the supposed but poorly characterized symbiotic stars and candidates (see also Merc et al 2020Merc et al , 2021Merc et al , 2022bMerc et al , 2023.…”

Section: Introductionmentioning

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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LAMOST J202629.80+423652.0 is not a symbiotic star

Cited by 2 publications

References 14 publications

Quasi-simultaneous photometric, polarimetric, and spectral observations of distant comet C/2014 B1 (Schwartz)

Quasi-simultaneous photometric, polarimetric, and spectral observations of distant comet C/2014 B1 (Schwartz)

Comprehensive Analysis of a Symbiotic Candidate V503 Her

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