SIMBAD references

2013ApJ...768L...6M - Astrophys. J., 768, L6 (2013/May-1)

The eclipsing binary cepheid OGLE-LMC-CEP-0227 in the Large Magellanic Cloud: pulsation modeling of light and radial velocity curves.

MARCONI M., MOLINARO R., BONO G., PIETRZYNSKI G., GIEREN W., PILECKI B., STELLINGWERF R.F., GRACZYK D., SMOLEC R., KONORSKI P., SUCHOMSKA K., GORSKI M. and KARCZMAREK P.

Abstract (from CDS):

We performed a new and accurate fit of light and radial velocity curves of the Large Magellanic Cloud (LMC) Cepheid–OGLE-LMC-CEP-0227–belonging to a detached double-lined eclipsing binary system. We computed several sets of nonlinear, convective models covering a broad range in stellar mass, effective temperature, and chemical composition. The comparison between theory and observations indicates that current theoretical framework accounts for luminosity–V and I band–and radial velocity variations over the entire pulsation cycle. Predicted pulsation mass–M = 4.14±0.06 M–and mean effective temperature–Te= 6100±50 K–do agree with observed estimates with an accuracy better than 1σ. The same outcome applies, on average, to the luminosity amplitudes and to the mean radius. We find that the best-fit solution requires a chemical composition that is more metal-poor than typical LMC Cepheids (Z = 0.004 versus 0.008) and slightly helium enhanced (Y = 0.27 versus 0.25), but the sensitivity to He abundance is quite limited. Finally, the best-fit model reddening–E(V - I) = 0.171±0.015 mag–and the true distance modulus corrected for the barycenter of the LMC–µ_0, LMC_= 18.50±0.02 ±0.10 (syst) mag–agree quite well with similar estimates in the recent literature.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - Magellanic Clouds - stars: distances - stars: variables: Cepheids

Simbad objects: 4

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2021.05.18-23:38:44

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