Search for binary central stars of the SMC PNe

Hajduk, M.; Gladkowski, M.; Soszyński, I.

doi:10.1051/0004-6361/201321682

Cited by 6 publications

(6 citation statements)

References 45 publications

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“…Only Jacoby SMC 1 (see Fig. 1) has a binary CS with a period of 1.16 days assuming the irradiation effect as a cause of the variations, or twice that period in the case of ellipsoidal variations (Hajduk, G ladkowski & Soszyński 2014). The rest of objects turned out to be the PNe mimics.…”

Section: Resultsmentioning

confidence: 98%

“…We analysed the OGLE-II and -III I-band photometry in the case of the SMC (Hajduk, G ladkowski & Soszyński 2014), and OGLE-III-IV I-band photometry for the LMC using the programs PERIOD04 (Lenz et al 2005) and PERANSO (www.peranso.com). This software offers a variety of period analysis methods from which we chose the analysis of variance (ANOVA, Schwarzenberg-Czerny 1996).…”

Section: Methods Of Analysismentioning

confidence: 99%

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Search for binary central stars of the Magellanic Clouds PNe

Gladkowski¹,

Hajduk

Soszyński

2016

Proc. IAU

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The Optical Gravitational Experiment (OGLE) was effectively used in discovering binary central stars of planetary nebulae (CSPNe). About 50 binary CSPNe have been hitherto identified in the Galaxy, almost half of them were detected in the OGLE database. We used the OGLE data to search for binary CSPNe in the Magellanic Clouds. We also searched for PNe mimics and removed them from the PNe sample. Here, we present results of the photometric analysis for Small Magellanic Cloud (SMC) and our progress on search of binary central stars in the Large Magellanic Cloud (LMC). So far, we have discovered one binary central star of the PN beyond the Milky Way, which is located in the Small Magellanic Cloud.

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Section: Resultsmentioning

confidence: 98%

Section: Methods Of Analysismentioning

confidence: 99%

Search for binary central stars of the Magellanic Clouds PNe

Gladkowski¹,

Hajduk

Soszyński

2016

Proc. IAU

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“…Four of the sources in our sample, including the previously identified planetary nebula LHA 115-N 61 (Hajduk et al 2014), have strong forbidden-line emission in their optical spectra ( Figure 4). Thirteen of our sources have little or no forbidden-line emission in their spectra.…”

Section: Optical Spectramentioning

confidence: 85%

Identification of Herbig Ae/Be Stars in the Small Magellanic Cloud

Keller

Sloan

Oliveira

et al. 2019

ApJ

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Protoplanetary disks orbiting intermediate-mass stars, Herbig Ae/Be stars, that have formed in a metal-poor environment may evolve differently than their Galactic cousins. A study of the planet-formation process in such an environment requires identification and characterization of a sample of candidates. We have observed several stars in the Small Magellanic Cloud, a nearby metal-poor dwarf galaxy, that have optical spectral properties of Herbig Ae/Be stars, including strong Hα emission, blue continuum excess, and spectral types ranging from early G to B. Infrared spectra of these sources from the Spitzer Space Telescope show strong excess emission indicating the presence of silicate dust, molecular and atomic gas, and polycyclic aromatic hydrocarbons. We present an analysis of the likelihood that these candidates are Herbig Ae/Be stars. This identification is the necessary first step to future investigations that will examine the role of metallicity in the evolution of protoplanetary disks.

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“…However, none of the eclipsing binaries have been confirmed so far. Shaw et al (2007a) A70, page 1 of 10 This paper is a continuation of our study of variability in the SMC PNe (Hajduk et al 2014a). The study is extended to the LMC.…”

Section: Introductionmentioning

confidence: 95%

Binary central stars of planetary nebulae in the Large Magellanic Cloud

Gładkowski,

Hajduk,

Smolec

et al. 2024

A&A

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Close binary central stars of planetary nebulae (PNe) must have formed through a common envelope evolution during the giant phase experienced by one of the stars. Transfer of the angular momentum from the binary system to the envelope leads to the shortening of the binary separations from the radius of red giant to the radius of the order of few tenths of AU. Thus, close binary central stars of planetary nebulae are laboratories to study the common envelope phase of evolution. The close binary fraction in the Galaxy has been measured in various sky surveys, but the close binary fraction is not yet well constrained for the Magellanic Clouds, and our results may help the study of common envelope evolution in low-metallicity environments. This paper presents a continuation of our study of variability in the Magellanic Cloud planetary nebulae on the basis of data from the OGLE survey. Previously, we had analysed the OGLE data in the Small Magellanic Cloud. Here, the study is extended to the Large Magellanic Cloud (LMC). In this paper we search for close binary central stars with the aim to constrain the binary fraction and period distribution in the LMC. We identified 290 counterparts of PNe in the LMC in the $I$-band images from the OGLE-III and OGLE-IV surveys. However, the light curves of ten objects were not accessible in the OGLE database, and thus we analysed the time series photometry of 280 PNe. In total, 32 variables were found, but 5 of them turned out to be foreground objects. Another 18 objects show irregular or regular variability that is not attributable to the binarity of their central stars. Their status and the nature of their variability will be verified in the follow-up paper. Nine binary central stars of PNe with periods between 0.24 and 23.6\,days were discovered. The obtained fraction for the LMC PNe is <!PCT!>$ without correcting for incompleteness. This number is significantly lower than the 12--21<!PCT!> derived in the analogous search in the Galactic bulge. We discuss this difference, taking into account observational biases. The lower binary fraction suggests a lower efficiency of the common envelope phase in producing close binaries in the LMC compared to the Galaxy.

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Search for binary central stars of the SMC PNe

Cited by 6 publications

References 45 publications

Search for binary central stars of the Magellanic Clouds PNe

Search for binary central stars of the Magellanic Clouds PNe

Identification of Herbig Ae/Be Stars in the Small Magellanic Cloud

Binary central stars of planetary nebulae in the Large Magellanic Cloud

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