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• W3101644332 endingPage "96" @default.
• W3101644332 startingPage "96" @default.
• W3101644332 abstract "In this work, we present the results of a spectroscopic study of very massive stars (VMSs) found outside the center of the massive stellar cluster NGC 3603. From the analysis of the associated Southern Astrophysical Research (SOAR) Telescope spectroscopic data and related optical–near-IR (NIR) photometry, we confirm the existence of several VMSs in the periphery of NGC 3603. The first group of objects (MTT58, WR42e, and RF7) is composed of three new Galactic exemplars of the OIf*/WN type, all of them with probable initial masses well above 100 and estimated ages of about 1 Myr. Based on our Goodman blue-optical spectrum of another source in our sample (MTT68), we can confirm the previous finding in the NIR of the only other Galactic exemplar (besides HD 93129A) of the O2If* type known to date. Based on its position relative to a set of theoretical isochrones in a Hertzprung–Russel (H–R) diagram, we concluded that the new O2If* star could be one of the most massive (150 ) and luminous (MV = −7.3) O-stars in the Galaxy. Also, another remarkable result is the discovery of a new O2v star (MTT31), which is the first exemplar of that class so far identified in the Milk Way. From its position in the H–R diagram it is found that this new star probably had an initial mass of 80 , as well as an absolute magnitude of MV = −6.0, corresponding to a luminosity similar to other known O2v stars in the Large Magellanic Cloud. Finally, we also communicate the discovery of a new Galactic O3.5If* star (RFS8) that is quite an intriguing case. Indeed, it is located far to the south of the NGC 3603 center, in apparent isolation at a large radial projected linear distance of ∼62 pc. Its derived luminosity is similar to that of the other O3.5If* (Sh18) found in NGC 3603's innermost region, and the fact that a such high mass star is observed so isolated in the field led us to speculate that perhaps it could have been expelled from the innermost parts of the complex by a close fly-by dynamical encounter with a very massive hard binary system." @default.
• W3101644332 created "2020-11-23" @default.
• W3101644332 creator A5044686971 @default.
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• W3101644332 date "2016-05-26" @default.
• W3101644332 modified "2023-10-06" @default.
• W3101644332 title "SOAR OPTICAL AND NEAR-INFRARED SPECTROSCOPIC SURVEY OF NEWLY DISCOVERED MASSIVE STARS IN THE PERIPHERY OF GALACTIC MASSIVE STAR CLUSTERS I-NGC 3603" @default.
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• W3101644332 doi "https://doi.org/10.3847/0004-637x/823/2/96" @default.
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