IDS and CCD study of the LMC excited blobs

Details IDS and CCD study of the LMC excited blobs IDS and CCD study of the LMC excited blobs

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...144...98h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 144, no. 1, March 1985, p. 98-108.

Astronomy and Astrophysics

Astrophysics

43

Abundance, Hydrogen Clouds, Interstellar Extinction, Magellanic Clouds, Nebulae, Spectrophotometry, Charge Coupled Devices, H Beta Line, Image Dissector Tubes, Ionized Gases, Star Distribution, Stellar Evolution

Scientific paper

IDS spectrophotometry of emission lines in the 3650 - 7000 Å range and CCD narrow-band imagery are presented for the newly detected Large Magellanic Cloud compact nebulae N159 Blob and N11A. For comparison purposes, the LMC H II region N159A is studied as well. The chemical abundance of He, N, O, and S relative to H are derived and discussed. The extinction is found to be extraordinarily high especially for N159 Blob, while the extinction derived for N11A represents a rather "normal" value for the LMC. A remarkable aspect of the blobs is their strong continuum at Hβ. These objects may be excited by a ZAMS star of Teff ≡ 44,000K (≡40 M_sun;) along with a cluster of B and A stars playing a minor part in the excitation. The masses derived for N159 Blob and N11A are ≡50 and 250 M_sun; respectively.

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