Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.9705g&link_type=abstract
American Astronomical Society, 189th AAS Meeting, #97.05; Bulletin of the American Astronomical Society, Vol. 28, p.1402
Astronomy and Astrophysics
Astronomy
Scientific paper
We have identified a ring-shaped emission-line nebula and a possible bipolar outflow centered on the B1.5 supergiant Sher #25 in the Galactic giant Hii region NGC 3603 (distance 6 kpc). The clumpy ring around Sher #25 appears to be tilted by 64(deg) against the plane of the sky. Its semi-major axis (position angle ~ 165(deg) ) is 6.9'' long, which corresponds to a ring diameter of 0.4 pc. The bipolar outflow filaments, presumably located above and below the ring plane on either side of Sher #25, show a separation of ~ 0.5 pc from the central star. High-resolution spectra show that the ring has a systemic velocity of v_LSR = +19 km s(-1) and a de-projected expansion velocity of 20 km s(-1) , and that one of the bipolar filaments has an outflow speed of ~ 83 km s(-1) . The spectra also show a high [Nii]/Hα ratio, suggestive of strong N enrichment. Sher #25 must be an evolved blue supergiant (BSG) past the red supergiant (RSG) stage. We discuss the results in the framework of RSG--BSG wind evolutionary models. We compare Sher #25 to the progenitor of SN1987A, which it resembles in many aspects.
Brandner Wolfgang
Chu Y.-H. Y.-H.
Grebel Eva Katharina
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