A survey of the Local Group of galaxies for symbiotic binary stars – I. First detection of symbiotic stars in M33

Mikołajewska, Joanna; Shara, Michael M.; Caldwell, Nelson; Iłkiewicz, Krystian; Zurek, David

doi:10.1093/mnras/stw2937

Cited by 25 publications

(16 citation statements)

References 46 publications

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“…The same objective-prism technique was applied also to the Magellanic Clouds and several SySt were discovered there too (Walker 1983;Morgan 1992). Searches for SySt in external galaxies have steadily progressed over the years (Gonc ¸alves et al 2008(Gonc ¸alves et al , 2012(Gonc ¸alves et al , 2015Kniazev et al 2009;Angeloni et al 2014;Mikołajewska, Caldwell & Shara 2014;Mikołajewska et al 2017;Roth et al 2018;Drozd et al 2019), and the current total of known extragalactic SySt amounts to ∼70 systems (Akras et al 2019;Chen, Liu & Shan 2019;Merc, Gális & Wolf 2019b). New surveys aiming to SySt within the Local Group (Angeloni et al 2019) promise to increase such numbers, especially for the burn-SySt type.…”

Section: The New Syst Probed By Galahmentioning

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: The New Syst Probed By Galahmentioning

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 emission line of He II at 4686Å is often observed in WD-symbiotics (Luna & Costa 2005;Miko lajewska et al 2017), and it is typical of supersoft X-ray sources. This line is often detected in many hot, accreting binaries, and it is always present in the spectra of accreting WDs.…”

Section: The Gemini Spectrummentioning

confidence: 98%

CXO J004318.8+412016, a steady supersoft X-ray source in M 31

Orio

Luna

Kotulla

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We obtained an optical spectrum of a star we identify as the optical counterpart of the M31 Chandra source CXO J004318.8+412016, because of prominent emission lines of the Balmer series, of neutral helium, and a He II line at 4686Å. The continuum energy distribution and the spectral characteristics demonstrate the presence of a red giant of K or earlier spectral type, so we concluded that the binary is likely to be a symbiotic system. CXO J004318.8+412016 has been observed in X-rays as a luminous supersoft source (SSS) since 1979, with effective temperature exceeding 40 eV and variable Xray luminosity, oscillating between a few times 10 35 erg s −1 and a few times 10 37 erg s −1 in the space of a few weeks. The optical, infrared and ultraviolet colors of the optical object are consistent with an an accretion disk around a compact object companion, which may either be a white dwarf, or a black hole, depending on the system parameters. If the origin of the luminous supersoft X-rays is the atmosphere of a white dwarf that is burning hydrogen in shell, it is as hot and luminous as postthermonuclear flash novae, yet no major optical outburst has ever been observed, suggesting that the white dwarf is very massive (m≥ 1.2 M ) and it is accreting and burning at the high rateṁ > 10 −8 M year −1 expected for type Ia supernovae progenitors. In this case, the X-ray variability may be due to a very short recurrence time of only mildly degenerate thermonuclear flashes.

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“…Some surveys have resulted in the identification of new extra-Galactic symbiotic variables or at least promising candidates (e.g. Gonçalves et al, 2008Gonçalves et al, , 2015Kniazev et al, 2009;Miko lajewska et al, 2014Miko lajewska et al, , 2017. Thanks to these surveys, the number of known symbiotic systems is growing rapidly.…”

Section: Symbiotic Starsmentioning

confidence: 99%

Galactic members in the New Online Database of Symbiotic Variables.

Merc¹,

Gális²,

Wolf³

2020

caosp

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Symbiotic variables belong to an interesting class of interacting binary stars. At the beginning of this century, a systematic search for these objects was begun and such surveys in the Milky Way and the Local Group have resulted in discoveries of many new symbiotics and dozens of candidates. Because the latest catalogue of symbiotic binaries has been outdated for almost two decades, we decided to prepare a new database of the Galactic and extra-Galactic symbiotic systems. We present it in this work. Our database is available online, allowing it to be up-to-date and available to the astronomical community at any time. The database also includes a web portal that allows easy data access without the necessity for any additional software or formatting of the data.

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A survey of the Local Group of galaxies for symbiotic binary stars – I. First detection of symbiotic stars in M33

Cited by 25 publications

References 46 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

CXO J004318.8+412016, a steady supersoft X-ray source in M 31

Galactic members in the New Online Database of Symbiotic Variables.

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