Possible detection of an old bipolar shell associated with η Carinae

Details Possible detection of an old bipolar shell associated with η Carinae Possible detection of an old bipolar shell associated with η Carinae

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.312..295b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 312, Issue 2, pp. 295-300.

Other

12

Stars: Individual: &Eta, Carinae, Stars: Variables: Other, Hii Regions, Ism: Individual: Ngc 3372

Scientific paper

Continuum-subtracted dereddened images in the light of several atomic lines show the presence of an extended bipolar nebula surrounding η Carinae with size ~100x45arcsec2 (1.3x0.5pc2). This feature is best delineated in [Oiii] 5007. The geometrical disposition and mass of the shell suggest that it was formed by mass ejections from η Carinae. The dynamic age of the nebula is ~13000/V7yr, where V7 is the mean expansion velocity in 100kms-1, and its mass is between 5 and 10Msolar. The nebula is photoionized and composed of unprocessed material. The major axes of the nebula and of the Homunculus are nearly perpendicular. We also report the discovery of elongated emission knots prominent in [Nii] located 64 to 100arcsec away from η Carinae, which implies that they were ejected either centuries ago or at a more recent date but with extremely large velocities.

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