Computer Science
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005mst..........1t&link_type=abstract
MSc Thesis
Computer Science
Eta Carinae, Homunculus, Ifu, Cirpass
Scientific paper
The Homunculus nebula was mapped using the integral field technique and the results are presented in this dissertation. The observations were obtained in the J band in the range from 10620 to 12960 Angstroms using the CIRPASS's IFU, which contains 499 hexagonal lenses. The spatial sampling is 0,25 arcsec/lens and the spectral resolution, set to R=3200. The [Fe II] 12567 line allowed the identification of two structures in the NW lobe that had not been reported yet. Doppler tomography of this structures revealed a low density region placed in the NW lobe that is not seen in the optical images. Besides, the Little Homunculus was also detected both in the mapping of components of the [Fe II] 12567 and in its velocity maps. In the Homunculus nebula, the polar regions (where the shock between the stellar bipolar wind and the internal wall of the lobes is stronger) are more opaque than the lobe walls. This can be verified by the decrease in the intensity of the [Fe II] 12567 in the SE lobe and the enhancement of this line emission in the NW lobe. Emissions due to the equatorial disc were detected both in the H series (Pa beta and Pa gamma) and the He I 10830 as an intrinsic component up to distances greater than the aparent dimensions of the dis!
c seen in the images taken in the optical range. The [Fe II] 12567 also presents the component due to the equatorial emission. Low density regions in the torus involving the central source allow a beam of radiation to escape to large radii and thereby excite the gas contained in the equatorial disc. The best example of this effect was detected in the Doppler tomography of the He I 10830 line, that revealed an intrinsic emission component which reaches distances larger than the aparent boundary of the NW lobe and was firstly mapped in this dissertation.
Damineli Augusto
Teodoro Mairan
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