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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Herrero, A.
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Topics
Publications (10/10 displayed)
- 2022The nature of the Cygnus extreme B supergiant 2MASS J20395358+4222505citations
- 2022Tailoring the magnetocaloric, magnetic and thermal properties of Dy6(Fe,Mn)X2 intermetallics (X Sb, Te, Bi)citations
- 2021Crystallographic, magnetic and magnetocaloric properties in novel intermetallic materials R3CoNi (R = Tb, Dy, Ho, Er, Tm, Lu)citations
- 2021Ab initio study of lithium decoration of popgraphene and hydrogen storage capacity of the hybrid nanostructurecitations
- 2020Surface rupture in stochastic slip modelscitations
- 2020Magnetocaloric properties and unconventional critical behavior in (Gd,Tb)6(Fe,Mn)Bi2 intermetallicscitations
- 2020Magnetocaloric properties, magnetic interactions and critical behavior in Ho6(Fe,Mn)Bi2 intermetallicscitations
- 2019Study of the magnetocaloric effect in intermetallics RTX (R = Nd, Gd; T = Sc, Ti; X = Si, Ge)citations
- 2018Critical behavior of the ferromagnetic transition in GdSc(Si,Ge) intermetallic compoundscitations
- 2006Comparison between microfabrication technologies for metal toolingcitations
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article
The nature of the Cygnus extreme B supergiant 2MASS J20395358+4222505
Abstract
2MASS J20395358+4222505 is an obscured early B supergiant near the massive OB star association Cygnus OB2. Despite its bright infrared magnitude (K<SUB>s</SUB> = 5.82) it has remained largely ignored because of its dim optical magnitude (B = 16.63, V = 13.68). In a previous paper, we classified it as a highly reddened, potentially extremely luminous, early B-type supergiant. We obtained its spectrum in the U, B and R spectral bands during commissioning observations with the instrument MEGARA at the Gran Telescopio CANARIAS. It displays a particularly strong H<SUB>α</SUB> emission for its spectral type, B1 Ia. The star seems to be in an intermediate phase between supergiant and hypergiant, a group that it will probably join in the near (astronomical) future. We observe a radial velocity difference between individual observations and determine the stellar parameters, obtaining T<SUB>eff</SUB> = 24 000 K and log g<SUB>c</SUB> = 2.88 ± 0.15. The rotational velocity found is large for a B supergiant, $v$ sin i = 110 ± 25 $ km\, s^{-1}$. The abundance pattern is consistent with solar, with a mild C underabundance (based on a single line). Assuming that J20395358+4222505 is at the distance of Cyg OB2, we derive the radius from infrared photometry, finding R = 41.2 ± 4.0 R<SUB>⊙</SUB>, log(L/L<SUB>⊙</SUB>) = 5.71 ± 0.04 and a spectroscopic mass of 46.5 ± 15.0 M<SUB>⊙</SUB>. The clumped mass-loss rate (clumping factor 10) is very high for the spectral type, ${M}$ = 2.4 × 10<SUP>-6</SUP> M<SUB>⊙</SUB> a<SUP>-1</SUP>. The high rotational velocity and mass-loss rate place the star at the hot side of the bi-stability jump. Together with the nearly solar CNO abundance pattern, they may also point to evolution in a binary system, J20395358+4222505 being the initial secondary....