Photometry of the LMC H II region N 159 A and of its stellar content. II - Young stars, gas, and dust

Details Photometry of the LMC H II region N 159 A and of its stellar content. II - Young stars, gas, and dust Photometry of the LMC H II region N 159 A and of its stellar content. II - Young stars, gas, and dust

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259..480d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 2, p. 480-492.

Astronomy and Astrophysics

Astrophysics

19

Astronomical Photometry, Cosmic Dust, Early Stars, H Ii Regions, Interstellar Gas, Star Clusters, Balmer Series, Interstellar Matter, Magellanic Clouds, Open Clusters

Scientific paper

This paper presents an analysis of the stellar and nebular photometric observations of the LMC H II region N 159 A and its surroundings. We have identified the probable exciting stars of N 159 A and of its smaller neighbor H II regions. Fourteen O-B2 stars are present in this field of 1.6 arcmin x 2.5 arcsec. N 159 A itself is ionized by a close pair of stars of probable spectral types O5 to O6 V, and O7 to O8 V; these stars are separated by 1.0 arcmin and are affected by a visual extinction of 1.2 to 1.4 mag. The protostar of Jones et al. (1986), lying at the border of N 159 A, corresponds to an H-alpha emission object which is possibly a very compact H II region or a Herbig Ae/Be star. The young stellar population (associated with the H II regions) is superposed on an older population of giants, aged 10 exp 9 yr or more. The observed stellar content of N 159 A successfully accounts for the level of ionization of the gas as well as for this region's radio continuum and Balmer line emission.

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