V618 Sgr: galactic eclipsing symbiotic nova detected in repeated outbursts

Merc, Jaroslav; Gális, R.; Velez, P.; Charbonnel, S.; Garde, O.; Dû, Pascal Le; Mulato, Lionel; Petit, Thomas; Bohlsen, T.; Curry, Stephen; Love, T.; Barker, Howard

doi:10.1093/mnras/stad1434

Cited by 6 publications

(3 citation statements)

References 38 publications

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“…In particular, for the observed period of 4.5 years, V-R color shifted to red from 1.1 mag to 1.6 mag indicating a decrease in the temperature of the object. Generally, the photometric behavior of Gaia19bpg is similar to that of a symbiotic nova in outburst (Merc et al, 2023). The current spectroscopic observations are expected to help classify this object.…”

Section: Gaia19bpgmentioning

confidence: 84%

Photometric and colorimetric studies of target objects using small and medium-size telescopes

Godunova,

Simon,

Markus

et al. 2024

caosp

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We report on follow-up studies of transient events and objects, which have been conducted in recent years using ground-based optical observations. BVRI photometry has been performed with small and medium-sized telescopes located in Europe and North America. The purpose of these studies, which are mainly focused on objects of unknown nature, is to reveal features of 206 V. Godunova et al.their variability that are critical for classifying the transients and understanding their evolution.We present here some results obtained from long-term monitoring of transients Gaia18aes, Gaia19bpg, as well as the quasar 4C +21.35.

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Section: Gaia19bpgmentioning

confidence: 84%

Photometric and colorimetric studies of target objects using small and medium-size telescopes

Godunova,

Simon,

Markus

et al. 2024

caosp

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“…The observation of Gaia also led to the detection of the first recorded outburst of the symbiotic star WRAY 15-1167 (Gaia22bou; Merc et al 2022b), and the detection of the fading of V2756 Sgr by Gaia (Gaia22eor) led to the revelation of its eclipsing nature (Merc et al 2022a). While the current work does not categorize V390 Sco as the first D-type symbiotic star discovered by Gaia, it emphasizes the ongoing importance of Gaia in advancing our understanding of the dynamic behavior exhibited by symbiotic stars.…”

Section: Discussionmentioning

confidence: 99%

Gaia23ckh: Symbiotic outburst of the assumed Mira variable V390 Sco

Merc,

Velez,

Charbonnel

et al. 2024

Astron Nachr

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The poorly studied variable star V390 Sco, previously classified as a Mira pulsator, was detected in a brightening event by the ESA Gaia satellite in September 2023. This work presents an analysis of available archival multifrequency photometric data of this target, along with our spectroscopic observations. Our findings lead to the conclusion that V390 Sco is a new symbiotic star identified by Gaia, currently undergoing a classical symbiotic outburst. Additionally, we uncovered three prior outbursts of this system through archival photometry. The outbursts recur approximately every 2330–2400 days, and we hypothesize the periastron passage in an eccentric orbit may trigger them, similarly to the case of BX Mon, DD Mic, or MWC 560. A detailed investigation into the nature of the donor star suggested that V390 Sco is an S‐type symbiotic star, likely hosting a less evolved, semiregularly pulsating giant donor, but not a Mira variable.

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“…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

Self Cite

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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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V618 Sgr: galactic eclipsing symbiotic nova detected in repeated outbursts

Cited by 6 publications

References 38 publications

Photometric and colorimetric studies of target objects using small and medium-size telescopes

Photometric and colorimetric studies of target objects using small and medium-size telescopes

Gaia23ckh: Symbiotic outburst of the assumed Mira variable V390 Sco

Comprehensive Analysis of a Symbiotic Candidate V503 Her

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