Ansae and the precession of central stars in planetary nebulae - The cases of NGC 5189 and NGC 6826

Details Ansae and the precession of central stars in planetary nebulae - The cases of NGC 5189 and NGC 6826 Ansae and the precession of central stars in planetary nebulae - The cases of NGC 5189 and NGC 6826

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...117...33p&link_type=abstract

Astronomy and Astrophysics, vol. 117, no. 1, Jan. 1983, p. 33-37.

Astronomy and Astrophysics

Astrophysics

20

Astronomical Maps, Forbidden Bands, Planetary Nebulae, Precession, Stellar Evolution, Binary Stars, Oxygen Spectra, Spectrum Analysis, Stellar Mass Ejection

Scientific paper

Evidence is presented for the presence of ansae in the planetary nebulae NGC 5189 and NGC 6826, and the origin of such ansae is discussed in relation to stellar precession. Electronographic exposures were obtained for NGC 6826 in the forbidden O III 4363 and 5007+4959, H I 6563, forbidden Ne III 3869, He 4686 and forbidden O II 3727/29 lines, and for NGC 5189 in the H I 6563, forbidden O III 5007 and forbidden N II 6583 lines. The observations of NGC 6826 show two small condensations in the forbidden O II map, which suggest the presence of low-excitation ansae. Isophotometric maps of NGC 5189 show multiple condensations preferably enhanced in the low excitation region, which can be associated with at least five pairs of ansae. The mechanism of ansae formation in separate mass ejections in sources such as NGC 5189 is then considered and the constraints on binary period arising from a mechanism in which stellar precession leading to multiple ansae is caused by torques from a binary companion are noted.

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