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2001A&A...372..667T - Astronomy and Astrophysics, volume 372, 667-675 (2001/6-3)

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

TESTOR G.

Abstract (from CDS):

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 (3700-10000Å) 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 2''. The core A of FWHM ∼2.1" or 0.6pc presents a high excitation [O III] λλ5007+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 13M. 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''.

Journal keyword(s): galaxies: Magellanic Clouds - ISM: individual objects: N26A-B, N25 (SMC) - ISM: HII regions - ISM: dust, extinction - stars: early-type

Nomenclature: Table 3: [T2001] NNN N=37 among (Nos 10-287).

CDS comments: in ref list Davies et al 1976MmRAS..81...89D instead of MNRAS. Coordinates for stars in Table 1 of this paper appear to have a systematic error (B. Skiff 12/11/03). A correction of +0s.4 in RA and +11" i n DEC has been applied.