Spectroscopy of planetary nebulae in M33

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dc.creatorMagrini, L.
dc.creatorPerinotto, M.
dc.creatorCorradi, R. L. M.
dc.creatorMampaso, A.
dc.date2003-01-08
dc.date.accessioned2026-07-07T12:58:14Z
dc.date.available2026-07-07T12:58:14Z
dc.descriptionSpectroscopic observations of 48 emission-line objects of M33 have been obtained with the multi-object, wide field, fibre spectrograph AF2/WYFFOS at the 4.2m WHT telescope (La Palma, Spain). Line intensities and logarithmic extinction, cbeta, are presented for 42 objects. Their location in the Sabbadin & D'Odorico diagnostic diagram (Halpha/[SII] vs Hlapha/[NII]) 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 4363A [OIII] 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 [SIII] line. N/H appears to be lower than the Galactic value; some possible explanations for this under-abundance are discussed.
dc.description18 pages, 1 JPEG figure and 3 Postscript figures, Accepted for publication in A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/0301129
dc.identifierhttp://arxiv.org/abs/astro-ph/0301129
dc.identifierAstron.Astrophys.400:511-520,2003
dc.identifierdoi:10.1051/0004-6361:20030031
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/225176
dc.subjectAstrophysics
dc.titleSpectroscopy of planetary nebulae in M33
dc.typetext

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