Detection and study of the compact HII region N26A-B in the Small Magellanic Cloud

Details Detection and study of the compact HII region N26A-B in the Small Magellanic Cloud Detection and study of the compact HII region N26A-B in the Small Magellanic Cloud

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...372..667t&link_type=abstract

Astronomy and Astrophysics, v.372, p.667-675 (2001)

Astronomy and Astrophysics

Astrophysics

14

Galaxies: Magellanic Clouds, Ism: Individual Objects: N26A-B, N25 (Smc), Ism: Hii Regions, Ism: Dust, Extinction, Stars: Early-Type

Scientific paper

This paper presents new imagery and spectrophotometric results for the N26 HII region in the Small Magellanic Cloud. The observations using monochromatic images and low-resolution spectra (3700-10 000 Å) reveal a compact and complex nebula composed of two cores A and B where A in the region of Hβ is brighter than B by a factor ~ 5 and distance of 2arcsec . The core A of FWHM ~ 2farcs 1 or 0.6 pc presents a high excitation [O III] lambda lambda5007 +4959/Hβ up to ~ 8 and a high reddening E(B-V) <= 0.6, while the core B is less excited but has a higher reddening >=0.8. 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 absorption and emission-line intensities. The total mass of the ionized gas is evaluated at 13 Msun. The chemical abundances of He, O, N, Ne, S, and Ar were computed. These abundances seem consistent with average abundances for SMC HII regions, except N that appears slightly overabundant. N26A-B is comparable to the objects previously observed in the LMC and SMC that we have called ``blobs''.

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