Abstract
view Abstract Citations (70) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS M2-9: A Planetary Nebula with an Eruptive Nucleus? Balick, Bruce Abstract 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. Publication: The Astronomical Journal Pub Date: February 1989 DOI: 10.1086/114996 Bibcode: 1989AJ.....97..476B Keywords: Evolution (Development); Planetary Nebulae; Stellar Spectra; Charge Coupled Devices; Emission Spectra; H Alpha Line; Astrophysics; NEBULAE: PLANETARY; NEBULAE: INDIVIDUAL full text sources ADS | data products SIMBAD (14)
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