New online database of symbiotic variables: Symbiotics in X‐rays

Merc, Jaroslav; Gális, R.; Wolf, M.

doi:10.1002/asna.201913662

Cited by 16 publications

(10 citation statements)

References 60 publications

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“…Symbiotic stars (SySt) are interacting binaries where a red giant (RG) fuels a white dwarf (WD) or a neutron star (NS) companion via accretion (either through Roche lobe overflow or wind intercept). Systems harbouring NSs are a recent addition to this class of celestial objects (Masetti et al 2006(Masetti et al , 2007a(Masetti et al ,b, 2011Bozzo et al 2018;Yungelson, Kuranov & Postnov 2019) and constitute a few per cent of the known total (Merc, Gális & Wolf 2019a), the vast majority E-mail: ulisse.munari@oapd.inaf.it containing WDs (Mukai et al 2016;Sokoloski et al 2017;Akras et al 2019). For some time, a main-sequence star accreting from the RG at very high rates (10 −6 to 10 −4 M yr −1 ) was considered a viable scenario for SySt in general (Kenyon & Webbink 1984), but this has been progressively abandoned in the light of expanding observational data, especially in the far-ultraviolet (UV) and X-rays (Skopal et al 2006;Sokoloski et al 2006;Mohamed & Podsiadlowski 2012;Luna et al 2013;Skopal & Cariková 2015;Lutovinov et al 2020).…”

Section: Introductionmentioning

confidence: 99%

The GALAH survey and symbiotic stars – I. Discovery and follow-up of 33 candidate accreting-only systems

Munari

Traven

Masetti

et al. 2021

Monthly Notices of the Royal Astronomical Society

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We have identified a first group of 33 new candidates for symbiotic stars (SySt) of the accreting-only variety among the 600 255 stars so far observed by the GALAH high-resolution spectroscopic survey of the Southern Hemisphere, more than doubling the number of those previously known. GALAH aims to high latitudes and this offers the possibility to sound the Galaxy for new SySt away from the usual Plane and Bulge hunting regions. In this paper we focus on SySt of the M spectral type, showing an Hα emission with a peak in excess of 0.5 above the adjacent continuum level, and not affected by coherent radial pulsations. These constraints will be relaxed in future studies. The 33 new candidate SySt were subjected to an array of follow-up confirmatory observations (X–ray/UV observations with the Swift satellite, search for optical flickering, presence of a near-UV upturn in ground-based photometric and spectroscopic data, radial velocity changes suggestive of orbital motion, variability of the emission line profiles). According to Gaia eDR3 parallaxes, the candidate new SySt are located at the tip of the Giant Branch, sharing the same distribution in M(KS) of the well established SySt. The accretion luminosities of the candidate new StSt are in the range 1−10 L⊙, corresponding to mass-accretion rates of 0.1-1 10−9 M⊙ yr−1 for WDs of 1 M⊙. The M giant of one of them presents a large Lithium over-abundance.

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Section: Introductionmentioning

confidence: 99%

The GALAH survey and symbiotic stars – I. Discovery and follow-up of 33 candidate accreting-only systems

Munari

Traven

Masetti

et al. 2021

Monthly Notices of the Royal Astronomical Society

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“…The connection between AMXPs and MSRPs seems to be supported by the discovery of the so-called "transitional millisecond radio pulsars" (tMSRPs); these are Table 3 A catalog of identified Galactic SyXBs and SyXB candidates. Table partially based on [168], see also [135,169]. "NS/BH" indicates nature of the compact object (via detection of Type I X-ray bursts or pulsations).…”

Section: Magnetically-channeled Accretion In Lmxbs: X-ray Pulsarsmentioning

confidence: 99%

Low-Mass X-ray Binaries

Bahramian¹,

Degenaar²

2022

Preprint

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A large fraction of X-ray sources in our Galaxy are low-mass X-ray binaries, containing a black hole or a neutron star accreting from a gravitationally bound low-mass ( < ∼ 1 M ) companion star. These systems are among the older population of stars and accreting systems in the Galaxy, and typically have long accretion histories. Low-mass X-ray binaries are categorized into various sub-classes based on their observed properties such as X-ray variability and brightness, nature of the companion star and/or the compact object, and binary configuration. In this Chapter, we review the phenomenology of sub-classes of these systems and summarize observational finding regarding their characteristics, populations, and their distribution in the Galaxy.

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“…Quasi-steady shell burning of the hydrogen-rich material on the surface of WD is probably also the source of super-soft X-ray emission of AG Dra. There are 58 other symbiotic stars which have been detected in X-rays (Merc et al, 2019c). Nine sources, AG Dra among them, show the super-soft emission which have been classified as the α type in the scheme introduced by Muerset et al (1997) and extended by Luna et al (2013).…”

Section: Ag Dra In the New Online Databasementioning

confidence: 99%

Yellow symbiotic star AG Draconis in the scope of the New Online Database of Symbiotic Variables

Merc¹,

Gális²,

Leedjärv³

et al. 2020

Preprint

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Symbiotic stars are strongly interacting binaries, consisting of a white dwarf and a cool giant, mainly of spectral type M. AG Draconis belongs to a less numerous group of the yellow symbiotic systems, as the cool component in this binary is of a spectral type earlier than K4. Recently, after seven years of quiescence, this symbiotic star exhibited a very unusual active stage with the four minor outbursts observed. Thanks to the excellent involvement of amateur astronomers and professional observatories, we can study the activity of AG Draconis in unprecedented details. In the present work, we discuss the activity and peculiarities of this interacting system within the entire group of symbiotic stars whose properties have recently been presented in our New Online Database of Symbiotic Variables.The Golden Age of Cataclysmic Variables and Related Objects V (GOLDEN2019)

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New online database of symbiotic variables: Symbiotics in X‐rays

Cited by 16 publications

References 60 publications

The GALAH survey and symbiotic stars – I. Discovery and follow-up of 33 candidate accreting-only systems

The GALAH survey and symbiotic stars – I. Discovery and follow-up of 33 candidate accreting-only systems

Low-Mass X-ray Binaries

Yellow symbiotic star AG Draconis in the scope of the New Online Database of Symbiotic Variables

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