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Titolo:
A SPECTROSCOPIC ANALYSIS OF B-STARS IN THE SMC CLUSTER NGC-330
Autore:
LENNON DJ; MAZZALI PA; PASIAN F; BONIFACIO P; CASTELLANI V;
Indirizzi:
UNIV STERNWARTE MUNCHEN,SCHEINERSTR 1 D-81679 MUNICH GERMANY OSSERV ASTRON TRIESTE I-34131 TRIESTE ITALY SCUOLA INT STUDI AVANZATI I-34131 TRIESTE ITALY UNIV PISA,IST ASTRON I-56100 PISA ITALY
Titolo Testata:
Space science reviews
fascicolo: 1-4, volume: 66, anno: 1993,
pagine: 169 - 172
SICI:
0038-6308(1993)66:1-4<169:ASAOBI>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
SMALL MAGELLANIC CLOUD; NGC 330; PHOTOMETRY;
Keywords:
NGC330; B-STARS; ABUNDANCES; EVOLUTION;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
11
Recensione:
Indirizzi per estratti:
Citazione:
D.J. Lennon et al., "A SPECTROSCOPIC ANALYSIS OF B-STARS IN THE SMC CLUSTER NGC-330", Space science reviews, 66(1-4), 1993, pp. 169-172

Abstract

Medium resolution (2A/px) but high s/n spectra of approximately twenty of the brightest blue stars in the young open cluster NGC 330 in theSMC have been analyzed in order to determine their atmospheric parameters and the evolutionary status. Stellar parameters are determined bycomparison with LTE and NLTE model atmosphere calculations and an HR diagram constructed. Luminosities of the sample stars lie in the range4.0 < log(L/L.) < 5.0 and spectral types between O9 and late-B. The stars in our sample appear to define 4 groups: main-sequence B-stars (B2-B4), B-supergiants (B4) in a blue-loop phase of evolution, a small number of blue stragglers (O9-B0 near main-sequence stars) and a groupof luminous giants (B1-B2) which reside in the so-called 'post main-sequence gap' of the BR diagram. Furthermore, we have confirmed spectroscopically the very high incidence of Be stars in this cluster. Finally the almost complete absence of metal lines (at this resolution) is in keeping with the expected very low metallicity of the SMC.

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Documento generato il 19/09/20 alle ore 14:03:42