The Antares Emission Nebula and Mass Loss of alpha Sco A

Details The Antares Emission Nebula and Mass Loss of alpha Sco A The Antares Emission Nebula and Mass Loss of alpha Sco A

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008msngr.132...33r&link_type=abstract

The Messenger, vol. 132, p. 33-36

Physics

Scientific paper

The Antares nebula has been known as a peculiar [FeII] emission nebula, apparently without normal HII region lines. Long-slit VLT/UVES mapping shows that it is an HII region 3'' in size around the B type star alpha Sco B, with a Balmer line recombination spectrum and [NII] lines, but no [OII] and [OIII]. The reason for the non-visibility of [OII] is the low electron temperature of 4900 K, while [NII] is seen because the nitrogen abundance is enhanced by a factor of three due to the CNO cycle. We derive a mass-loss rate of 1.05 ± 0.3 × 10-6 MSun/yr for the M supergiant alpha Sco A. The [FeII] lines seem to come mainly from the edges of the HII region.

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