The Clusters Ages Experiment (CASE). II. The Eclipsing Blue Straggler OGLEGC 228 in the Globular Cluster 47 Tuc

Kałużny, J.; Thompson, I. B.; Ruciński, S. M.; Pych, W.; Stachowski, G.; Krzemiński, W.; Burley, Greg

doi:10.1086/519023

Cited by 45 publications

(55 citation statements)

References 41 publications

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“…At first, if not considering contact binaries, binary evolution can produce two kinds of blue-straggler binaries (as shown in Figure 1): those are still experiencing mass transfer (e.g. V228 in 47 Tuc, Kaluzny et al 2007) and those have finished mass transfer (e.g. WOCS 4348, 4540 and 5379 in NGC 188, Gosnell et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Contribution of Primordial Binary Evolution to the Two Blue-straggler Sequences in Globular Cluster M30

Jiang

Chen

et al. 2017

ApJ

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Two blue-straggler sequences discovered in globular cluster M30 provide a strong constraint on the formation mechanisms of blue stragglers. We study the formation of the blue-straggler binaries through binary evolution, and find that binary evolution can contribute to the blue stragglers in both of the sequences. Whether a blue straggler is located in the blue sequence or red sequence depends on the contribution of the mass donor to the total luminosity of the binary, which is generally observed as a single star in globular clusters. The blue stragglers in the blue sequence have a cool white-dwarf companion, while the majority (∼ 60%) of the objects in the red sequence are the binaries that are still experiencing mass transfer, but there are also some objects that the donors have just finished the mass transfer (the stripped-core stars, ∼ 10%) or the blue stragglers (the accretors) have evolved away from the blue sequence (∼ 30%). Meanwhile, W UMa contact binaries found in both sequences may be explained by various mass ratios, that is, W UMa contact binaries in the red sequence have two components with comparable masses (e.g. mass ratio q ∼ 0.3-1.0), while those in the blue sequence have low mass ratio (e.g. q < 0.3). However, the fraction of blue sequence in M30 cannot be reproduced by binary population synthesis if we assumed the initial parameters of a binary sample to be the same as that of the field. This possible indicates that dynamical effects on binary systems is very important in globular clusters.

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Section: Introductionmentioning

confidence: 99%

Contribution of Primordial Binary Evolution to the Two Blue-straggler Sequences in Globular Cluster M30

Jiang

Chen

et al. 2017

ApJ

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“…For some, i.e. the detached systems, it is possible to measure distances (Paczyński 1997), which is particularly useful in the case of star clusters (see e.g., Bonanos et al 2006;Kaluzny et al 2007). Pulsating variables, such as Cepheids and RR Lyrae, serve as such distance indicators (e.g., Benedict et al 2007;Feast et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Deep census of variable stars in a VLT/VIMOS field in Carina

Pietrukowicz

Minniti

Fernández

et al. 2009

A&A

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Aims. We searched for variable stars in deep V-band images of a field towards the Galactic plane in Carina. Methods. The images were taken with the VIMOS instrument at ESO VLT during 4 contiguous nights in April 2005. We detected 348 variables among 50 897 stars in the magnitude range between V = 15.4 and V = 24.5 mag. After detection, we classified the variables by a direct eye inspection of their light curves. Results. All variable objects besides 9 OGLE transits in the field are new discoveries. We provide a complete catalog of all variables, which includes eclipsing/ellipsoidal binaries, miscellaneous pulsators (mostly δ Scuti-type variables), stars with flares, and other (irregular and likely long-period) variables. Only two of the stars in our sample are known to host planets. Conclusions. Our result has implications for future large variability surveys.

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“…Torres et al (2010). Data for evolved (t > ∼ 10 Gyr) systems were taken from: Popper et al (1986);Popper (1994); Kałużny et al (2007Kałużny et al ( , 2008; Thompson et al (2001Thompson et al ( , 2010; Lacy et al (2005). Pre-main-sequence systems data were taken from: Irwin et al (2007); Stassun et al (2007Stassun et al ( , 2008 ; Çakırlı et al (2009); Çakırlı &İbanoǧlu (2010).…”

Section: Discussionmentioning

confidence: 99%

“…This makes it one of the oldest low-mass eclipsing systems known to date. Recently several evolved low-mas eclipsing binaries were found in globular clusters: a 0.81 + 0.68 M , older than 10 Gyr OGLEGC 17 in ω Cen (Thompson et al 2001), 0.945+0.144 M system V209 in the same cluster 6 (Kałużny et al 2007), a 12 Gyr-old, 0.79 + 0.23 M binary V32 in NGC 6397 (Kałużny et al 2008), and the already mentioned V69-47Tuc (Thompson et al 2010). In all these cases the primary begins to evolve onto the sub-giant branch.…”

Section: Inflated Asas-04mentioning

confidence: 92%

Orbital and physical parameters of eclipsing binaries from the All-Sky Automated Survey catalogue

Hełminiak¹,

Konacki²

2010

A&A

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Aims. We present the results of our detailed spectroscopic and photometric analysis of two previously unknown <1 M detached eclipsing binaries: ASAS J045304-0700.4 and ASAS J082552-1622.8. Methods. With the HIgh Resolution Echelle Spectrometer (HIRES) on the Keck-I telescope, we obtained spectra of both objects covering large fractions of orbits of the systems. We also obtained V and I band photometry with the 1.0-m Elizabeth telescope of the South African Astronomical Observatory (SAAO). The orbital and physical parameters of the systems were derived with the PHOEBE and JKTEBOP codes. We investigated the evolutionary status of both binaries with several sets of widely-used isochrones. −0.014 R . Both systems show significant out-of-eclipse variations, probably owing to large, cold spots. We also investigated the influence of a third light in the second system.

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The Clusters Ages Experiment (CASE). II. The Eclipsing Blue Straggler OGLEGC 228 in the Globular Cluster 47 Tuc

Cited by 45 publications

References 41 publications

Contribution of Primordial Binary Evolution to the Two Blue-straggler Sequences in Globular Cluster M30

Contribution of Primordial Binary Evolution to the Two Blue-straggler Sequences in Globular Cluster M30

Deep census of variable stars in a VLT/VIMOS field in Carina

Orbital and physical parameters of eclipsing binaries from the All-Sky Automated Survey catalogue

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