Toward Early-type Eclipsing Binaries as Extragalactic Milestones. II. NLTE Spectral Analysis and Stellar Parameters of the Detached O-type System OGLE-LMC-ECL-06782 in the LMC

Taormina, M.; Kudritzki, Rolf‐Peter; Puls, J.; Pilecki, B.; Eva, Sextl,; Pietrzyński, G.; Urbaneja, M. A.; Gieren, W.

doi:10.3847/1538-4357/ab6bd0

Cited by 10 publications

(2 citation statements)

References 59 publications

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“…At this point it is un-clear what the physical reason for the offset is. There are many reasons which could affect the evolution of massive stars into the BSG phase such as changes in mass-loss or rotational properties (see Meynet et al 2015) or changes in the internal angular momentum transport and rotational mixing (see Taormina et al 2020). At the same time there is also the possibility that the spectroscopic measurement of BSG flux-weighted gravities are subject to systematic uncertainties.…”

Section: Modified Gravity and Flux-weighted Gravitymentioning

confidence: 99%

Modified Gravity and the Flux-weighted Gravity-Luminosity Relationship of Blue Supergiant Stars

Sextl,

Kudritzki,

Weller

et al. 2021

Preprint

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We calculate models of stellar evolution for very massive stars and include the effects of modified gravity to investigate the influence on the physical properties of blue supergiant stars and their use as extragalactic distance indicators. With shielding and fifth force parameters in a similar range as in previous studies of Cepheid and tip of the red giant branch (TRGB) stars we find clear effects on stellar luminosity and flux-weighted gravity. The relationship between flux weighted gravity, g F ≡ g/T 4 eff , and bolometric magnitude M bol (FGLR), which has been used successfully for accurate distance determinations, is systematically affected. While the stellar evolution FGLRs show a systematic offset from the observed relation, we can use the differential shifts between models with Newtonian and modified gravity to estimate the influence on FGLR distance determinations. Modified gravity leads to a distance increase of 0.05 to 0.15 magnitudes in distance modulus. These change are comparable to the ones found for Cepheid stars. We compare observed FGLR and TRGB distances of nine galaxies to constrain the free parameters of modified gravity. Not accounting for systematic differences between TRGB and FGLR distances shielding parameters of 5×10 −7 and 10 −6 and fifth force parameters of 1/3 and 1 can be ruled out with about 90% confidence. Allowing for potential systematic offsets between TRGB and FGLR distances no determination is possible for a shielding parameter of 10 −6 . For 5×10 −7 a fifth force parameter of 1 can be ruled out to 92% but 1/3 is unlikely only to 60%.

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Section: Modified Gravity and Flux-weighted Gravitymentioning

confidence: 99%

Modified Gravity and the Flux-weighted Gravity-Luminosity Relationship of Blue Supergiant Stars

Sextl,

Kudritzki,

Weller

et al. 2021

Preprint

Self Cite

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“…The uncertainty on the K photometry often exceeds 0.03 mag in our sample, considering an arbitrary error could therefore induce an underestimation of the photometric uncertainty and finally a bias in the calibration of the relation. Taormina et al (2019Taormina et al ( , 2020 analyzed two early-type eclipsing binaries in the LMC with the aim to obtain precise and accurate stellar parameters of each early-type stars, which were then used to derive the surface brightness. They compare the measurements of their first binary system BLMC-01 of class IV or V, with the all-classes relation of Challouf et al (2014) and they find good agreement.…”

Section: Comparison With the Literaturementioning

confidence: 99%

Progress on the calibration of surface brightness-color relations for early- and late-type stars

Salsi,

Nardetto,

Mourard

et al. 2021

Preprint

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Context. Surface brightness-color relations (SBCRs) are widely used for estimating angular diameters and deriving stellar properties. They are critical to derive extragalactic distances of early-type and late-type eclipsing binaries or, potentially, for extracting planetary parameters of late-type stars hosting planets. Various SBCRs have been implemented so far, but strong discrepancies in terms of precision and accuracy still exist in the literature. Aims. We aim to develop a precise SBCR for early-type B and A stars using selection criteria, based on stellar characteristics, and combined with homogeneous interferometric angular diameter measurements. We also improve SBCRs for late-type stars, in particular in the Gaia photometric band. Methods. We observed 18 early-type stars with the VEGA interferometric instrument, installed on the CHARA array. We then applied additional criteria on the photometric measurements, together with stellar characteristics diagnostics in order to build the SBCRs. Results. We calibrated a SBCR for subgiant and dwarf early-type stars. The RMS of the relation is σ F V 0 = 0.0051 mag, leading to an average precision of 2.3% on the estimation of angular diameters, with 3.1% for V − K < −0.2 mag and 1.8% for V − K > −0.2 mag. We found that the conversion between Johnson-K and 2MASS-K s photometries is a key issue for early-type stars. Following this result, we have revisited our previous SBCRs for late-type stars by calibrating them with either converted Johnson-K or 2MASS-K s photometries. We also improve the calibration of these SBCRs based on the Gaia photometry. The expected precision on the angular diameter using our SBCRs for late-type stars ranges from 1.0% to 2.7%. Conclusions. By reaching a precision of 2.3% on the estimation of angular diameters for early-type stars, significant progress has been made to determine extragalactic distances, such as M31 and M33 galaxies, using early-type eclipsing binaries.

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Eclipsing Binary Stars as Precise and Accurate Distance Indicators

Pietrzyński,

Graczyk

2024

Springer Series in Astrophysics and Cosmology

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Toward Early-type Eclipsing Binaries as Extragalactic Milestones. II. NLTE Spectral Analysis and Stellar Parameters of the Detached O-type System OGLE-LMC-ECL-06782 in the LMC

Cited by 10 publications

References 59 publications

Modified Gravity and the Flux-weighted Gravity-Luminosity Relationship of Blue Supergiant Stars

Modified Gravity and the Flux-weighted Gravity-Luminosity Relationship of Blue Supergiant Stars

Progress on the calibration of surface brightness-color relations for early- and late-type stars

Eclipsing Binary Stars as Precise and Accurate Distance Indicators

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