J/MNRAS/234/583 Abundances in Magellanic Cloud planetary nebulae (Monk+ 1988)
An optical spectrophotometric survey of abundances in Magellanic Cloud
planetary nebulae
Monk D.J., Barlow M.J., Clegg R.E.S.
<Mon. Not. R. Astron. Soc. 234, 583 (1988)>
=1988MNRAS.234..583M 1988MNRAS.234..583M (SIMBAD/NED BibCode)
ADC_Keywords: Planetary nebulae ; Spectroscopy ; Magellanic Clouds
Abstract:
Optical spectroscopic data for 71 Planetary Nebulae (PN) in the Large
and Small Magellanic Clouds have been analysed. The line fluxes have
been used to determine nebular temperatures, densities, and the
abundances of He, N, O, Ne and Ar, relative to H. In our sample there
are 12 nebulae with N/O≥0.5, resembling Peimbert's Type I PN; six
low-excitation objects [1≤I(5007)/I(H{beat})≤4], and four very-low
excitation (VLE) nebulae [I(Hβ)>I(5007)], similar to the Galactic
VLE class. Mean abundances have been calculated for the nebulae not in
these special groups. After correction for collisional excitation
contributions to the nebular He I lines, PN in the SMC and LMC yield
mass fractions of Y=0.249±0.025 and Y=0.258±0.012, respectively.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1a 40 903 Corrected relative line intensities for
LMC PN: medium resolution
table1b 40 367 Corrected relative line intensities for
LMC PN: low resolution
table1c 40 161 Corrected relative line intensities for
SMC PN: medium resolution
table1d 40 234 Corrected relative line intensities for
SMC PN: low resolution
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See also:
J/ApJS/75/407 : PNe Magellanic Cloud optical spectroscopy. I
J/ApJS/76/1085 : PNe Magellanic Cloud optical spectroscopy. II
J/ApJS/83/87 : PNe Magellanic Cloud optical spectroscopy. III
J/A+AS/121/407 : LMC planetary nebulae positions (Leisy+ 1997)
Byte-by-byte Description of file: table1a table1b table1c table1d
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Bytes Format Units Label Explanations
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1- 4 I4 0.1nm Lambda Wavelength
6- 18 A13 --- ID Identification of the line
20- 24 A5 --- PN Planetary nebula identification
26- 31 A6 --- Name Planetary nebula name
33 A1 --- l_I(Lambda) limit flag on I(Lambda)
34- 39 F6.1 --- I(Lambda) Measured line intensity (I(Hbeta)=100)
40 A1 --- u_I(Lambda) Uncertainty flag on I(Lambda)
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Acknowledgements: Pierre Leisy
(End) Patricia Bauer [CDS] 03-Oct-1996