M2-9 - A planetary nebula with an eruptive nucleus?

Details M2-9 - A planetary nebula with an eruptive nucleus? M2-9 - A planetary nebula with an eruptive nucleus?

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..476b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 97, Feb. 1989, p. 476-480. Research supported by the National Optical Astronomy Obse

Astronomy and Astrophysics

Astronomy

57

Evolution (Development), Planetary Nebulae, Stellar Spectra, Charge Coupled Devices, Emission Spectra, H Alpha Line

Scientific paper

M2-9 is a striking bipolar, or butterfly, planetary nebula (PN) whose nuclear spectrum is uncharacteristic of PN nuclei. Narrow lines ranging in ionization from O I, Fe II, forbidden Fe II, and Si II through forbidden O III are observed in the stellar spectrum. The H-alpha emission line has wings extending nearly 11,000 km/s at the base, and there is a deep self-absorption feature near the H-alpha line peak at the same velocity as nebular gas observed in one of the two bipolar lobes. The spectrum of M2-9's nucleus is more similar to the slow nova RR Tel, some symbiotic stars, and Seyfert (type 1.9) galactic nuclei than the central stars of most other PNs. Although its morphology, size, and nebular spectrum share many similarities with other PNs, M2-9 may not share a common evolutionary history with that class of objects.

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