J/AZh/82/437 Calculated chemical composition of galactic PN (Holovatyy+, 2005)
The chemical composition of galactic planetary nebulae with regard to
inhomogeneity in the gas density in their envelopes.
Holovatyy V.V., Havrilova N.V.
<Astron. Zh. 82, 437 (2005)>
=2005AZh....82..437H 2005AZh....82..437H
=2005ARep..49...390H 2005ARep..49...390H
ADC_Keywords: Planetary nebulae ; Abundances ; Models, atmosphere
Abstract:
The results of a study of the chemical compositions of Galactic
planetary nebulae taking into account two types of inhomogeneity in
the nebular gas density in their envelopes are reported. New
analytical expressions for the ionization correction factors have been
derived and are used to determine the chemical compositions of the
nebular gas in Galactic planetary nebulae. The abundances of He, N, O,
Ne, S, and Ar have been found for 193 objects. The Y-Z diagrams for
various He abundances are analyzed for type II planetary nebulae
separately and jointly with HII regions. The primordial helium
abundance Yp and enrichment ratio dY/dZ are determined, and the
resulting values are compared with the data of other authors. Radial
abundance gradients in the Galactic disk are studied using type II
planetary nebulae.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
objects.dat 48 87 Object coordinates
table1.dat 119 16 Empirical relationships for the chemical
composition of nebular gas
refs.dat 65 11 References
table2.dat 92 37 Ionization correction factors for type I (F)
and type II (FF) inhomogeneity in the gas
density distribution.
table3.dat 81 81 *Helium abundances in type II Galactic PN based
on two, three and four HeI lines
table4.dat 98 75 Chemical composition of type II Galactic PN for
the two types of inhomogeneity
table5.dat 114 16 *Yp and dY/dZ for the two types of inhomogeneity
(I and II) and three sets of HeI lines.
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Note on table3.dat, table5.dat: The three set of HeI lines are
2l: (4471Å, 5976Å),
3l: (4471Å, 5976Å, 6678Å) and
4l: (4471Å, 5976Å, 6678Å, 7065Å).
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See also:
V/84 : Galactic Planetary Nebulae Strasbourg-ESO Cat. (Acker+, 1992)
J/A+A/280/581 : Chemical abundances of PNe (Pasquali+, 1993)
J/A+A/380/300 : Abundances of PN towards Galactic bulge (Escudero+, 2001)
J/A+A/423/199 : Chemical abundances of planetary nebulae (Costa+, 2004)
Byte-by-byte Description of file: objects.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- PN Planerary nebulae name
12- 13 I2 h RAh Right ascension (J2000.0)
15- 16 I2 min RAm Right ascension (J2000.0)
18- 21 F4.1 s RAs Right ascension (J2000.0)
23 A1 --- DE- Declination sign (J2000.0)
24- 25 I2 deg DEd Declination (J2000.0)
27- 28 I2 arcmin DEm Declination (J2000.0)
30- 31 I2 arcsec DEs Declination (J2000.0)
35- 48 A14 --- SName Simbad name
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq Relationship sequential number
4- 7 A4 --- A/H Ratio considered
8 A1 --- --- [=]
9-105 A97 --- Rel Relationship that determine A/H
107-111 F5.3 --- R(A/H) (A/H)[calc]/(A/H)[mod] ratio (1)
113-119 A7 --- r_R(A/H) References
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Note (1): A is the parameter that characterizes the outflow of
stellar matter during separation of nebula shell.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 41 A18 --- Aut Author's name
46- 65 A20 --- Com Comments
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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- 2 A2 --- Type [F ] Type I (F) or II (FF) of inhomogeneity
3- 4 I2 --- Seq Relationship sequential number
6- 7 A2 --- A Element considered
9- 24 A16 --- Int Interval in which x is included (1)
26- 31 A6 --- A+i Ion at ith ionization stage
33- 45 A13 --- x Ion abundance ratio for elements in adjacent
ionization stage x=A+k+1/A+k (1)
47- 54 F8.5 --- C0 C0 polynomial coefficient (1)
56- 63 F8.5 --- C1 C1 polynomial coefficient (1)
65- 72 F8.5 --- C2 C2 polynomial coefficient (1)
74- 81 F8.5 --- C3 ? C3 polynomial coefficient (1)
83- 86 F4.2 --- r Correlation coefficient for the relationship
88- 92 F5.3 --- R(A/H) (A/H)[calc]/(A/H)[mod] ratio
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Note (1): We considered log[(A+i/H+)/(A/H)]=f(x), with x=log(A+k+1/A+k).
There relationships were approximated by a polynomial function:
f(x)=C0 + C1*x +C2*x2 + C3*x3
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- PN Planetary nebula name
10 A1 --- n_PN [*] * denotes PN without the HeII 4686Å line
13- 18 F6.4 --- (He/H)2l Helium abundances based on two HeI lines
(4471Å, 5976Å)
21- 28 F8.6 --- e_(He/H)2l Error on He/Htwo
31- 36 F6.4 --- (He/H)3l ? Helium abundances based on three HeI lines
(4471Å, 5976Å, 6678Å)
39- 44 F6.4 --- e_(He/H)3l ? Error on He/Hthree
47- 52 F6.4 --- (He/H)4l ? Helium abundances based on four HeI lines
(4471Å,5976Å,6678Å,7065Å)
55- 67 F13.11 --- e_(He/H)4l ? Error on He/Hfour
69- 74 F6.4 --- <He/H> Averaged by standard method helium abundance
76- 81 F6.4 --- e_<He/H> ? Error on He/H
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- PN Planetary nebula name
11- 17 E7.3 --- O/H(I) ? Oxygen abundance of PN of type I
20- 26 E7.3 --- O/H(II) ? Oxygen abundance of PN of type I
29- 35 E7.3 --- N/H(I) ? Nitrogen abundance of PN of type I
38- 44 E7.3 --- N/H(II) ? Nitrogen abundance of PN of type I
47- 53 E7.3 --- Ne/H(I) ? Neon abundance of PN of type I
56- 62 E7.3 --- Ne/H(II) ? Neon abundance of PN of type I
65- 71 E7.3 --- S/H(I) ? Sulphur abundance of PN of type I
74- 80 E7.3 --- S/H(II) ? Sulphur abundance of PN of type I
83- 89 E7.3 --- Ar/H(I) ? Argon abundance of PN of type I
92- 98 E7.3 --- Ar/H(II) ? Argon abundance of PN of type I
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq Relationship sequential number
4- 8 F5.3 --- Yp Pregalactic He content
10- 16 E7.3 --- e_Yp rms uncertainty on Yp
18- 21 F4.2 --- dY/dZ He enrichment
23- 27 F5.3 --- e_dY/dZ rms uncertainty on dY/DZ
29- 30 I2 --- No Number of objects used for the calculation
32- 33 A2 --- --- [PN]
35- 36 A2 --- Type [I II] Type of PN
38-114 A77 --- Notes Notes
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(End) Veta Avedisova [INASAN] 13-Feb-2006