J/A+A/380/300 Abundances of PN towards Galactic bulge (Escudero+, 2001)
Abundances of recently discovered planetary nebulae towards the Galactic bulge
Escudero A.V., Costa R.D.D
<Astron. Astrophys. 380, 300 (2001)>
=2001A&A...380..300E 2001A&A...380..300E
ADC_Keywords: Planetary nebulae ; Abundances, peculiar
Keywords: ISM: planetary nebulae ; galactic bulge ; spectroscopy
Abstract:
In this work we report spectrophotometric observations of a planetary
nebula sample towards the galactic bulge. A total of 45 PNe was
observed and their physical parameters (electron density and
temperature) were derived. Ionic abundances were calculated using a
three-level atom model and abundances were derived through ionisation
correction factors. Results show low abundance objects at high
galactic latitudes, indicating a possible vertical gradient inside the
bulge. A few objects with low N/O ratio were found, which could have
originated from old, low mass progenitors.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
nebulae.dat 29 45 Positions of the nebulae (from Simbad)
fluxes.dat 30 826 Line fluxes for the measured nebulae
(table 2 & 3 in the paper)
tables.tex 124 139 LaTeX version of the tables
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See also:
V/84 : Strasbourg-ESO Catalogue of Galactic Planetary Nebulae (Acker+, 1992)
J/A+A/373/536 : New galactic bulge PNe (van de Steene+, 2001)
J/A+AS/125/289 : Planetary nebulae radial velocities (Zijlstra+ 1997)
J/ApJ/515/610 : New PN in southern Galactic Bulge (Beaulieu+, 1999)
J/A+A/423/199 : Chemical abundances of planetary nebulae (Costa+, 2004)
Byte-by-byte Description of file: nebulae.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- PN Planetary nebula name
10- 11 I2 h RAh Right ascension (J2000.0)
13- 14 I2 min RAm Right ascension (J2000.0)
16- 19 F4.1 s RAs Right ascension (J2000.0)
21 A1 --- DE- Declination sign (J2000.0)
22- 23 I2 deg DEd Declination (J2000.0)
25- 26 I2 arcmin DEm Declination (J2000.0)
28- 29 I2 arcsec DEs Declination (J2000.0)
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Byte-by-byte Description of file: fluxes.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- PN Planetary nebula name
8- 15 A8 --- Line Line name
17- 20 I4 0.1nm Lambda Wavelength
21 A1 --- n_Lambda [+] + when two wavelengths
22- 23 I2 0.1nm Lambda2 ? Last two digits of the second wavelength
25- 30 F6.1 --- Flux Flux of PN at line "Line" (F(Hβ)=100)
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Acknowledgements: Roberto Costa
(End) Patricia Bauer [CDS] 22-Oct-2001