NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-12-17 T01:32:34 PST
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For refcode 2003A&A...400..511M:
Retrieve 35 NED objects in this reference.
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NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
2003A&A...400..511M Spectroscopy of planetary nebulae in M 33 L. Magrini, M. Perinotto, R. L. M. Corradi, A. Mampaso 1 - Dipartimento di Astronomia e Scienza dello Spazio, Universita di Firenze, L.go E. Fermi 2, 50125 Firenze, Italy 2 - Isaac Newton Group of Telescopes, Apartado de Correos 321, 38700 Santa Cruz de La Palma, Canarias, Spain 3 - Instituto de Astrofisica de Canarias, c. Via Lactea s/n, 38200, La Laguna, Tenerife, Canarias, Spain Received 7 August 2002 / Accepted 29 November 2002 Abstract. Spectroscopic observations of 48 emission-line objects of M 33 have been obtained with the multi-object, wide field, fibre spectrograph AF2/WYFFOS at the 4.2 m WHT telescope (La Palma, Spain). Line intensities and logarithmic extinction, c_{beta}_, are presented for 42 objects. Their location in the Sabbadin & D'Odorico diagnostic diagram (H{alpha}/[S II] vs. H{alpha}/[N II]) suggests that >70% of the candidates are Planetary Nebulae (PNe). Chemical abundances and nebular physical parameters have been derived for the three of the six PNe where the 4363 A [O III] emission line was measurable. These are disc PNe, located within a galactocentric distance of 4.1 kpc, and, to date, they are the farthest PNe with a direct chemical abundance determination. No discrepancy in the helium, Oxygen and Argon abundances has been found in comparison with corresponding abundances of PNe in our Galaxy. Only a lower limit to the sulphur abundance has been obtained since we could not detect any [S III] line. N/H appears to be lower than the Galactic value; some possible explanations for this under-abundance are discussed. Key words: planetary nebulae: individual: M 33 - galaxies: individual: M 33 - galaxies: abundances
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