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

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

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.190p..59b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 190, Mar. 1980, p. 59P-63P.

Astronomy and Astrophysics

Astronomy

18

Astronomical Spectroscopy, Interstellar Matter, K Lines, Magellanic Clouds, Nebulae, Interstellar Extinction, Signal To Noise Ratios, Stellar Winds, Supernovae

Scientific paper

A high signal-to-noise spectrum of the interstellar Ca II K line in HD 38268 in the 30 Doradus nebula of the Large Magellanic Cloud is presented. Interstellar absorption occurs over a heliocentric velocity range from +10 to +315 km/sec. A broad (approximately 120 km/sec), weak and asymmetric Ca II K 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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