On the nature of the Wolf-Rayet component in the core of the massive galactic H II region NGC 3603

Details On the nature of the Wolf-Rayet component in the core of the massive galactic H II region NGC 3603 On the nature of the Wolf-Rayet component in the core of the massive galactic H II region NGC 3603

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...284..631m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 15, 1984, p. 631-636. Research supported by the National Researc

Astronomy and Astrophysics

Astrophysics

25

H Ii Regions, Nebulae, Star Clusters, Stellar Spectrophotometry, Wolf-Rayet Stars, Absorption Spectra, Astronomical Catalogs, Binary Stars, O Stars, Radial Velocity, Stellar Motions

Scientific paper

The optical spectra of HD 97950, the luminous core of NGC 3603, were examined for variability which would indicate the presence of a single supermassive object or a cluster of smaller objects. Seventy spectrograms were made of HD 97950 from 1979-82, covering the 3700-4900 A range. Radial velocities were calculated from the strongest lines viewed. The WN6+O5 spectrum exhibited a 72 km/sec radial velocity variation with about a 3.8 day period. The data could be fitted by a system of two or three Wolf-Rayet stars. Radial oscillations of a very massive star, such as R136 in 30 Dor, are unlikely due to the absence of a stable harmonic mode with a period of 0.5 day. It is concluded that HD 97950 is composed of more than one star.

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