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Titolo:
Detection and study of the compact HII region N26A-B in the Small Magellanic Cloud
Autore:
Testor, G;
Indirizzi:
Observ Paris, Sect Meudon, DAEC, F-92195 Meudon, France Observ Paris Meudon France F-92195 Meudon, DAEC, F-92195 Meudon, France
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 2, volume: 372, anno: 2001,
pagine: 667 - 675
SICI:
1432-0746(200106)372:2<667:DASOTC>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
H-II-REGIONS; STARS; LMC; BLOB; EXTINCTION; EXCITATION; PARAMETERS; DISCOVERY; PROGRAM; N88A;
Keywords:
galaxies : Magellanic Clouds; ISM : individual objects : N26A-B, N25 (SMC); ISM : HII regions; ISM : dust, extinction; stars : early-type;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Testor, G Observ Paris, Sect Meudon, DAEC, F-92195 Meudon, France Observ Paris Meudon France F-92195 AEC, F-92195 Meudon, France
Citazione:
G. Testor, "Detection and study of the compact HII region N26A-B in the Small Magellanic Cloud", ASTRON ASTR, 372(2), 2001, pp. 667-675

Abstract

This paper presents new imagery and spectrophotometric results for the N26HII region in the Small Magellanic Cloud. The observations using monochromatic images and low-resolution spectra (3700-10 000 Angstrom) reveal a compact and complex nebula composed of two cores A and B where A in the region of H beta is brighter than B by a factor similar to5 and distance of 2". The core A of FWHM similar to2."1 or 0.6 pc presents a high excitation [O III] lambda lambda 5007 + 4959/H beta up to similar to8 and a high reddening E(B-V) less than or equal to 0.6, while the core B is less excited but has ahigher reddening greater than or equal to0.8. Each core contains one exciting source; the brighter one should be responsible for the high excitation of A. The apparent spectral type of the two cores ranges from O7 to O9 V and the gas electron density and temperature were derived from the absorptionand emission-line intensities. The total mass of the ionized gas is evaluated at 13 M-circle dot. The chemical abundances of He, O, N, Ne, S, and Ar were computed. These abundances seem consistent with average abundances forSMC HII regions, except N that appears slightly overabundant. N26A-B is comparable to the objects previously observed in the LMC and SMC that we havecalled "blobs".

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 23:12:50