J/A+A/423/199 Chemical abundances of planetary nebulae (Costa+, 2004)
Chemical abundances of planetary nebulae towards the galactic anticenter.
Costa R.D.D., Uchida M.M.M., Maciel W.J.
<Astron. Astrophys. 423, 199 (2004)>
=2004A&A...423..199C 2004A&A...423..199C
ADC_Keywords: Planetary nebulae ; Abundances, peculiar
Keywords: ISM: planetary nebulae: general - Galactic disk - ISM: abundances
Abstract:
In this paper, we report new observations and derive chemical
abundances for a sample of 26 planetary nebulae (PN) located in the
anti-center direction. Most of these nebulae are far away objects,
located at galactocentric distances greater than about 8kpc, so that
they are particularly useful for the determination of the radial
gradients at large distances from the galactic center.
Description:
The observations were carried out at two different observatories:
at ESO/La Silla, and at LNA/Brazil.
At ESO we used the 1.52m telescope and the Boller & Chivens Cassegrain
spectrograph, in two observational runs: Dec./1999 and Dec./2000.
at LNA, in Dec./1995, we used the 1.60 m telescope, a Boller & Chivens
Cassegrain spectrograph and a combination grating+CCD. Table 1 gives
the logbook of the observations and also the adopted distances d (kpc)
to the Sun and galactocentric distances R (kpc).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 64 26 Log of the observations and distances
table2.dat 34 492 Line fluxes of 26 planetary nebulae
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See also:
V/84 : Strasbourg-ESO Catalogue of Galactic PNe (Acker+, 1992)
J/A+A/380/300 : Abundances of PN towards Galactic bulge (Escudero+, 2001)
J/A+A/345/629 : Abundance gradients in planetary nebulae (Maciel+, 1999)
J/A+A/282/436 : Abundance gradients from disk PNs (Maciel+ 1994)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Planetary nebulae name
10- 19 A10 --- PNG PNG designation
21- 22 I2 h RAh Right ascension (J2000)
24- 25 I2 min RAm Right ascension (J2000)
27- 28 I2 s RAs Right ascension (J2000)
30 A1 --- DE- Declination sign (J2000)
31- 32 I2 deg DEd Declination (J2000)
34- 35 I2 arcmin DEm Declination (J2000)
37- 38 I2 arcsec DEs Declination (J2000)
40- 42 A3 --- Site Site of observation (1)
46- 54 A9 --- Date Date of observation
56- 58 F3.1 kpc Dist ? Adopted distance
60- 63 F4.1 kpc R ? Galactocentric distance
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Note (1): Sites of observation:
ESO: ESO/La Silla
LNA: LNA/Brazil
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Ion Line identification
10- 13 I4 0.1nm lambda Wavelength
14 A1 --- --- [+]
15- 16 I2 --- n_lambda ? Last 2 digits of the second wavelength when
interval
18- 25 A8 --- Name Planetary nebula name
27- 32 F6.1 --- Flux Line flux (Hbeta=100)
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Acknowledgements: Walter Maciel
(End) Patricia Vannier [CDS] 13-May-2004