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Titolo:
HST study of the LMC compact star-forming region N83B
Autore:
Heydari-Malayeri, M; Charmandaris, V; Deharveng, L; Rosa, MR; Schaerer, D; Zinnecker, H;
Indirizzi:
Observ Paris, DEMIRM, F-75014 Paris, France Observ Paris Paris France F-75014 v Paris, DEMIRM, F-75014 Paris, France Cornell Univ, Dept Astron, Ithaca, NY 14853 USA Cornell Univ Ithaca NY USA 14853 Univ, Dept Astron, Ithaca, NY 14853 USA Observ Marseille, F-13248 Marseille, France Observ Marseille Marseille France F-13248 lle, F-13248 Marseille, France European So Observ, Space Telescope European Coordinating Facil, D-85748 Garching, Germany European So Observ Garching Germany D-85748 l, D-85748 Garching, Germany European Space Agcy, Space Sci Dept, Div Astrophys, F-75738 Paris, France European Space Agcy Paris France F-75738 strophys, F-75738 Paris, France Observ Midi Pyrenees, F-31400 Toulouse, France Observ Midi Pyrenees Toulouse France F-31400 s, F-31400 Toulouse, France Astrophys Inst Potsdam, D-14482 Potsdam, Germany Astrophys Inst Potsdam Potsdam Germany D-14482 D-14482 Potsdam, Germany
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 2, volume: 372, anno: 2001,
pagine: 495 - 507
SICI:
1432-0746(200106)372:2<495:HSOTLC>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
LARGE-MAGELLANIC-CLOUD; WOLF-RAYET STARS; H-II-REGIONS; STELLAR ASSOCIATIONS; OB ASSOCIATIONS; MASSIVE STARS; PHOTOMETRY; BLOB; EXTINCTION; EVOLUTION;
Keywords:
stars : early-type; dust, extinction; HII regions; individual objects : N83B; galaxies : Magellanic Clouds;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Heydari-Malayeri, M Observ Paris, DEMIRM, 61 Ave Observ, F-75014 Paris, France Observ Paris 61 Ave Observ Paris France F-75014 rance
Citazione:
M. Heydari-Malayeri et al., "HST study of the LMC compact star-forming region N83B", ASTRON ASTR, 372(2), 2001, pp. 495-507

Abstract

High resolution imaging with the Hubble Space Telescope has uncovered the thus far hidden stellar content and the nebular features of the high excitation compact Hii region N83B in the Large Magellanic Cloud (LMC). We discover that the Hii region is powered by the most recent massive starburst in the OB association LH5 and the burst has created about 20 blue stars spread over similar to 30" on the sky (7.5 pc). Globally N83B displays a turbulentenvironment typical of newborn massive star formation sites. It contains an impressive ridge, likely created by a shock and a cavity with an estimated age of only similar to 30 000 yr, sculpted in the ionized gas by the powerful winds of massive stars. The observations bring to light two compact Hii blobs, N83B-1 and N83B-2, and a small arc-nebula, N83B-3, lying inside the larger Hii region. N83B-1, only similar to2".8 (0.7 pc) across, is the brightest and most excited part of N83B. It harbors the presumably hottest star of the burst and is also strongly affected by dust with an extinction ofA(V) = 2.5 mag. The second blob, N83B-2, is even more compact, with a sizeof only similar to1" (0.3 pc). All three features are formed in the borderzone between the molecular cloud and the ionized gas possibly in a sequential process triggered by the ionization front of an older Hii region. Our HST imaging presents an interesting and rare opportunity to observe details in the morphology of star formation on very small spatial scales in the LMCwhich are in agreement with the concept of the fractal structure of molecular star-forming clouds. A scenario which supports hierarchical massive star formation in the LMC OB association LH5 is presented.

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Documento generato il 04/04/20 alle ore 02:42:15