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2005MNRAS.357..304H - Mon. Not. R. Astron. Soc., 357, 304-324 (2005/February-2)
Forty eclipsing binaries in the Small Magellanic Cloud: fundamental parameters and Cloud distance.
HILDITCH R.W., HOWARTH I.D. and HARRIES T.J.
Abstract (from CDS):
The overall properties of the detached systems are consistent with theoretical models for the evolution of single stars with SMC metal abundances (Z≃ 0.004); in particular, observed and evolutionary masses are in excellent agreement. Although there are no directly applicable published models, the overall properties of the semidetached systems are consistent with them being in the slow phase of mass transfer in case A. About 40 per cent of these semidetached systems show photometric evidence of orbital-phase-dependent absorption by a gas stream falling from the inner Lagrangian point on the secondary star towards the primary star. This sample demonstrates that case-A mass transfer is a common occurrence amongst high-mass binaries with initial orbital periods P≲ 5 d, and that this slow phase has a comparable duration to the detached phase preceding it.
Each system provides a primary distance indicator. We find a mean distance modulus to the SMC of 18.91±0.03±0.1 (internal and external uncertainties; D= 60.6 ± 1.0±2.8 kpc). This value represents one of the most precise available determinations of the distance to the SMC.
Abstract Copyright: 2004 RAS
Journal keyword(s): binaries: close - binaries: eclipsing - binaries: general - binaries: spectroscopic - Magellanic Clouds
CDS comments: Table 1: OGLE-PSF = OGLE SMC-SCNN NNNNNN, OGLE-DIA = OGLE JHHMMSS.ss+DDMMSS.s
Simbad objects: 42
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