The unique interstellar Ca II K profile in the direction of 30 Doradus

Open Access

1 January 1980

journal article
Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society

Vol. 190 (1) , 59P-63P
https://doi.org/10.1093/mnras/190.1.59p

Abstract

We present a high signal-to-noise spectrum of the interstellar Ca IIK line in HD 38268 in the 30 Doradus nebula of the Large Magellanic Cloud. Interstellar absorption occurs over a heliocentric velocity range from +10 to +315 km s^–1. A broad (~ 120 kms^–1), weak and asymmetric Ca IIK feature, occurring on the blueward wing of the main LMC component is detected for the first time. It is shown that this unusually broad interstellar feature could have been generated by an energetic stellar wind emanating from the central OB cluster of 30 Doradus or by supernova explosions. Alternatively, the interstellar absorption may originate in a region well separated from 30 Doradus, perhaps in a halo of the LMC.

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