J/ApJ/417/209 Faint planetary nebulae in Magellanic Clouds (Jacoby+, 1993)
Improved observations of faint planetary nebulae in the Magellanic Clouds.
Jacoby G.H., Kaler J.B.
<Astrophys. J. 417, 209 (1993)>
=1993ApJ...417..209J 1993ApJ...417..209J
ADC_Keywords: Magellanic Clouds ; Planetary nebulae ; Spectroscopy ; Abundances
Keywords: Magellanic clouds - planetary nebulae: general
Abstract:
The accuracy of spectrophotometry for Magellanic Cloud planetary
nebulae is limited by a number of physical effects and operational
difficulties: atmospheric dispersion, wavelength-dependent seeing,
pointing and guiding errors, and a background of numerous stars and
diffuse emission. We describe procedures to minimize the impact of
some of these. We then compare our results for both bright and faint
objects with published values. There are a few exceptional cases
(e.g., LMC 89), but generally we find that bright planetary nebulae in
the Clouds have been observed with high accuracy. On the other hand,
observations of the faint sample from Jacoby (1980ApJS...42....1J 1980ApJS...42....1J)
suffer seriously from many of these effects. We also compare published
λ5007 photometry with new CCD photometry for nine faint
planetary nebulae. We find the photographic photometry presented by
Jacoby (1980ApJS...42....1J 1980ApJS...42....1J) to be accurate to 0.26mag. Fluxes for
the fainter objects that are derived from spectrophotometry (Boroson &
Liebert, 1989ApJ...339..844B 1989ApJ...339..844B) are found to be less reliable. In
comparison, spectrophotometry using the observational techniques
presented in this paper provides reliable absolute fluxes. With these
improved observations, we review the correlations presented by Kaler &
Jacoby (1990ApJ...362..491K 1990ApJ...362..491K, 1991ApJ...382..134K 1991ApJ...382..134K) between abundance
ratios and central star mass. The new results fit our earlier
correlation for N/O, strengthen that for He/H, and change little about
those for C/O and O/H.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2a.dat 68 12 General data on nebulae
table2.dat 105 33 Corrected line ratios
table4.dat 76 12 Chemical compositions
table5.dat 31 9 *Stellar Parameters
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Note on table5.dat: LMC 89,98, and 100 do not meet criteria for
high optical depth, so stellar parameters cannot be found.
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See also:
J/A+AS/121/407 : LMC planetary nebulae positions (Leisy+ 1997)
J/A+AS/116/95 : Magellanic Clouds PNe line intensities (Leisy+, 1996)
J/A+AS/102/451 : Emission-line stars and PNe in the SMC (Meyssonnier+ 1993)
J/AJ/117/238 : LMC extended catalog (Bica+, 1999)
J/ApJS/101/41 : SMC and Bridge extended catalog (Bica+ 1995)
J/ApJ/365/471 : Planetary nebulae as standard candles. VI. (Jacoby+, 1990)
J/ApJS/75/407 : LMC + SMC PNe optical spectroscopy. I (Meatheringham+ 1991)
J/ApJS/76/1085 : LMC + SMC PNe optical spectroscopy. II (Meatheringham+ 1991)
J/ApJS/83/87 : LMC + SMC PNe optical spectroscopy. III (Vassiliadis+ 1992)
J/MNRAS/234/583 : Abundances in Magellanic Cloud planetary nebulae (Monk+ 1988)
Byte-by-byte Description of file: table2a.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Nebula name
9- 21 A13 --- SName Simbad name
24- 25 I2 h RAh Right ascension (J2000.0), from Simbad
27- 28 I2 min RAm Right ascension (J2000.0), from Simbad
30- 33 F4.1 s RAs Right ascension (J2000.0), from Simbad
35 A1 --- DE- Declination sign (J2000.0), from Simbad
36- 37 I2 deg DEd Declination (J2000.0), from Simbad
39- 40 I2 arcmin DEm Declination (J2000.0), from Simbad
42- 43 I2 arcsec DEs Declination (J2000.0), from Simbad
46- 49 F4.2 mag c Reddening constant (mag per air mass)
51- 57 F7.3 [Jy] LogF(Hb) Hβ flux
59- 64 F6.2 --- LogI(Hb) Hβ intensity
66- 68 A3 --- Ref References (1)
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Note (1): References for comparison of the data are as follows:
a = see Meatheringham & Dopita 1991, Cat. J/ApJS/75/407
b = see Monk et al. 1988, Cat. J/MNRAS/234/583
c = see Aller et al., 1981MNRAS.194..613A 1981MNRAS.194..613A
d = see Boroson & Liebert, 1989ApJ...339..844B 1989ApJ...339..844B
e = see Meatheringham & Dopita 1991, Cat. J/ApJS/76/1085
f = see Aller, 1983ApJ...273..590A 1983ApJ...273..590A
g = see Vassiliadis et al. 1992, Cat. J/ApJS/83/87
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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- 4 I4 0.1nm Lambda Wavelength
6- 26 A21 --- Ident Identification of the line
27- 32 F6.2 --- SMC15 ? SMC15 corrected line ratio (1)
33- 37 F5.1 --- SMCJ6 ? SMCJ6 corrected line ratio (1)
39- 43 F5.1 --- SMCJ18 ? SMCJ18 corrected line ratio (1)
45- 49 F5.1 --- LMC25 ? LMC25 corrected line ratio (1)
51- 56 F6.1 --- LMC32 ? LMC32 corrected line ratio (1)
59- 63 F5.1 --- LMC54 ? LMC54 corrected line ratio (1)
65- 70 F6.1 --- LMC89 ? LMC89 corrected line ratio (1)
72- 77 F6.1 --- LMC98 ? LMC98 corrected line ratio (1)
79- 84 F6.1 --- LMC100 ? LMC100 corrected line ratio (1)
87- 91 F5.1 --- LMCJ20 ? LMCJ20 corrected line ratio (1)
93- 98 F6.1 --- LMCJ22 ? LMCJ22 corrected line ratio (1)
101-105 F5.1 --- LMCJ38 ? LMCJ38 corrected line ratio (1)
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Note (1): Corrected line ratios, on Hβ=100 scale.
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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- 7 A7 --- Name Nebula name
9- 13 I5 K T[OIII] Electron temperature from [OIII] line
14 A1 --- n_T[OIII] [*] Note on T[OIII] (1)
16- 20 I5 K T[NII] Electron temperature from [NII] line
21 A1 --- n_T[NII] [*] Note on T[NII] (1)
23- 26 I4 cm-3 Ne Electron density, mainly from [SII] line
27 A1 --- n_Ne [)] Note on Ne (2)
29- 33 F5.3 --- O+ O+ (OII) elemental abundance
35- 38 F4.2 --- O++ O++ (OIII) elemental abundance
40- 43 F4.2 --- O/H ? Abundance ratio, O/H
45- 49 F5.3 --- He+ ? He+ (HeII) elemental abundance
51- 55 F5.3 --- He++ ? He++ (HeIII) elemental abundance
57- 61 F5.3 --- He/H ? Abundance ratio, He/H
63- 67 F5.2 --- N/O ? Abundance ratio, N/O
69- 72 F4.2 --- C/O ? Abundance ratio, C/O
74- 76 A3 --- Comm Comments (3)
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Note (1): Asterisk mean value found from He II and Kaler 1986.
Note (2): ')' mean value derived from L*. All other Ne, are from [SII]
except for SMC 15 (see note (3), c).
Note (3): Comments are numbered as follows:
c = Uses mean [O II] density from Dopita et al. (1988ApJ...327..639D 1988ApJ...327..639D)
and Barlow (1987MNRAS.227..161B 1987MNRAS.227..161B)
d = Red data from Boroson & Liebert (1989ApJ...339..844B 1989ApJ...339..844B)
e = New object.
f = No density available, 1000cm-3 adopted.
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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- 7 A7 --- Name Nebula name
9 A1 --- n_Name [b] b: New Object
12- 17 I6 K T Stellar temperature
20- 23 I4 solLum Lum Stellar luminosity
28- 31 F4.2 solMass Mass Stellar mass
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History:
Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 27-Jun-2003