The role of stellar envelope convection in gravity-darkening and its relation to observational data

İnlek, G.; Böke, Aysun; Yilmaz, Oktay; Budding, E.

doi:10.1016/j.newast.2006.12.005

Cited by 2 publications

(5 citation statements)

References 8 publications

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“…We studied the effects of lower metallicity mixture opacity tables in some stellar modelling examples for intermediate-low mass stars. Inlek et al [11] showed that increases of the radius are associated with increasing envelope opacity. In their study, changes from the earlier LAOL opacity tables [15] to later ones that included more detailed line absorption effects changed with the radii up to  5-10.…”

Section: Remarksmentioning

confidence: 99%

“…In this study, we collected opacity data that were calculated using the OPAL code in the study of Allard [9] and Weiss [10]. Inlek et al [11] worked with the stellar model codes GOB (generates outer boundary conditions) and SCH (generates zero age main sequence star models) of Paczynski [12] and applied these programs to real observational data. They discussed the use of such sources as the OPAL code.…”

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confidence: 99%

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Paczynski yıldız modellemesinde kullanılmak için opaklık tabloları ve onların yıldız evrimlerine etkileri

İnlek¹

2019

Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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We have constructed opacity tables for using in stellar modelling in a format particularly applicable to the Paczynski freeware program GOB. Our tables are derived from those of Allard and Weiss for lower metal content envelopes, using the Lagrange interpolation method. This allows accurate opacities to be given as numerical functions of density and temperature with given proportions of hydrogen (X), helium (Y), and 'metals' (Z). Inlek et al. showed that it is possible independently to check opacity effects from modern high-quality observational data. These tables will be useful for such purposes.

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Section: Remarksmentioning

confidence: 99%

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confidence: 99%

Paczynski yıldız modellemesinde kullanılmak için opaklık tabloları ve onların yıldız evrimlerine etkileri

İnlek¹

2019

Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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“…Vaz et al (2007) sought to test evolutionary models by reference to just the mass and radius parameters, as against colour‐dependent ones. They also argued that systems with eccentric orbits have an extra possibility to check modelling via their apsidal motion constants, although the precision of that test was challenged by İnlek et al (2008). They examined their absolute parameters for U Oph AB against a range of newer models from Claret (2004) and the Padova group (Girardi et al 2000), which include more recent Opacity Project at Livermore (OPAL) opacities as well as possibilities for core overshooting effects and mass loss.…”

Section: Evolutionary Status and Stellar Environmentmentioning

confidence: 99%

“…But Vaz et al (2007) also made cautionary remarks about this kind of comparison; for example, there are different conventions for the exact determination of isochrones. Moreover, the unknown free parameter of metallicity can be at least as significant in its effects as variations in the opacity tables of different source calculations (see also, İnlek et al 2008). Yet if it could be confidently found from stellar modelling, metallicity would be an interesting parameter in Galactic contexts.…”

Section: Evolutionary Status and Stellar Environmentmentioning

confidence: 99%

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Absolute parameters of young stars - I. U Ophiuci

Budding

İnlek

Demirçan³

2009

Monthly Notices of the Royal Astronomical Society

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We have carried out an investigation of the early‐type multiple star U Oph. We have used new high‐resolution spectroscopy with the High Efficiency and Resolution Canterbury University Large Echelle Spectrograph (HERCULES) and 1‐m McLellan Telescope of the University of Canterbury at Mt John University Observatory and literature‐sourced optical and ultraviolet photometry. We applied the local reduction package [HERCULES Reduction Software Package (HRSP)] and other software to the spectroscopic data to find radial velocities. Information limit optimization techniques (ILOT) utilizing physically realistic fitting functions were applied to these data to yield new sets of absolute parameters: M1= 5.13, M2= 4.56 (±2 per cent); R1= 3.41, R2= 3.08 (±1 per cent); for the early‐type eclipsing binary that dominates the system. We have combined times‐of‐minima photometry with other data for the triple system that makes up ADS 10428A, utilizing the wide orbit of Wolf et al. as well as HIPPARCOS astrometry of U Oph. ILOT techniques applied to the astrometric orbit yield a mass of the third star as 0.83 M⊙. We estimate an age of the system of around 30–40 Myr, from the isochrones of Bertelli, results given by Vaz, Andersen & Claret, as well as our own tests with an updated version of Paczyński's stellar modelling code. This age and other details are consistent with a possible origin in Gould's Belt. Such information for this, and comparable young multiple star systems, may help to clarify general properties of star formation and the subtle interactions of stars and their environment.

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The role of stellar envelope convection in gravity-darkening and its relation to observational data

Cited by 2 publications

References 8 publications

Paczynski yıldız modellemesinde kullanılmak için opaklık tabloları ve onların yıldız evrimlerine etkileri

Paczynski yıldız modellemesinde kullanılmak için opaklık tabloları ve onların yıldız evrimlerine etkileri

Absolute parameters of young stars - I. U Ophiuci

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