Ultraviolet and optical spectral morphology of Melnick 42 and Radcliffe 136a in 30 Doradus

Details Ultraviolet and optical spectral morphology of Melnick 42 and Radcliffe 136a in 30 Doradus Ultraviolet and optical spectral morphology of Melnick 42 and Radcliffe 136a in 30 Doradus

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...393l..13w&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 393, no. 1, July 1, 1992, p. L13-L16.

Astronomy and Astrophysics

Astronomy

31

H Ii Regions, O Stars, Stellar Winds, Ultraviolet Astronomy, Wolf-Rayet Stars, Iue, Magellanic Clouds, Stellar Mass, Stellar Spectrophotometry, Ultraviolet Spectroscopy

Scientific paper

HST/GHRS ultraviolet spectrograms of the individual O3 If*/WN6-A object Mk 42 in 30 Dor and the adjacent, central multiple system R136a are compared with each other and with an appropriate sequence of O3 If* and WN6-A standards from the IUE archive. The analogous spectral montages covering the blue-violet region, based on new, homogeneous, digital observations of the same stars with the CTIO 4 m telescope, are also presented. These comparisons show clearly the intermediate O3/WN nature of the Mk 42 spectrum, in terms of both emission-line strength (increasing with envelope density) and stellar-wind velocity (decreasing with envelope density). It is also shown that R136a possesses stronger WN spectral characteristics than Mk 42, in agreement with HST narrow-band imaging by the WF/PC Team.

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