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Spectroscopy of planetary nebulae in M33 | L. Magrini
; M. Perinotto
; R.L.M. Corradi
; A. Mampaso
; | Date: |
8 Dec 2002 | Journal: | Astron.Astrophys. 400 (2003) 511-520 | Subject: | astro-ph | Affiliation: | Dipartimento di Astronomia e Scienza dello Spazio, Firenze Isaac Newton Group of Telescopes, La Palma, Spain Instituto de Astrofisica de Canarias, Tenerife, Spain | Abstract: | Spectroscopic 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. | Source: | arXiv, astro-ph/0301129 | Services: | Forum | Review | PDF | Favorites |
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