التفاصيل البيبلوغرافية
| العنوان: |
Using a new spectral disentangling approach to ascertain whether the massive binary HDE 228766 contains a Wolf–Rayet star. |
| المؤلفون: |
Quintero, Edwin A, Eenens, Philippe |
| المصدر: |
Monthly Notices of the Royal Astronomical Society; Aug2024, Vol. 532 Issue 2, p2604-2614, 11p |
| مصطلحات موضوعية: |
WOLF-Rayet stars, STELLAR spectra, STELLAR winds, SUPERGIANT stars, SPECTRUM analysis |
| مستخلص: |
The massive binary HDE 228766 is composed of an O type primary and an evolved secondary. However, previous qualitative analyses of the composite spectrum have led to a wide discussion about whether the secondary is an Of or a Wolf–Rayet star. We use new observations and our novel QER20 package to disentangle for the first time the spectra of the two stellar components and obtain artefact |$-$| free reconstructed spectra, yielding the more accurate and reliable spectral classifications of O7.5 V((f))z for the primary and O6 Iaf for the secondary. The emission features of the P |$-$| Cygni profiles of the H |$\beta$| and He i 5876 Å lines, present in the reconstructed spectrum of the secondary, show that this star is at an initial phase of its transition to the WN evolutionary stage. A previously unobserved variable emission, composed of at least four independent features, is seen since 2014 superposed to the H |$\gamma$| absorption line. Our analysis reveals that these emission features originate from a physically extended region. This could be explained by an episode of enhanced mass-loss in the scenario of a non |$-$| conservative evolution of the binary. [ABSTRACT FROM AUTHOR] |
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