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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
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) 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) to be accurate to 0.26mag. Fluxes for the fainter objects that are derived from spectrophotometry (Boroson & Liebert, 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, 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:
FileName Lrecl Records Explanations
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
Note on table5.dat: LMC 89,98, and 100 do not meet criteria for high optical depth, so stellar parameters cannot be found.
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
Bytes Format Units Label Explanations
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)
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 d = see Boroson & Liebert, 1989ApJ...339..844B e = see Meatheringham & Dopita 1991, Cat. J/ApJS/76/1085 f = see Aller, 1983ApJ...273..590A g = see Vassiliadis et al. 1992, Cat. J/ApJS/83/87
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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)
Note (1): Corrected line ratios, on Hβ=100 scale.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
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)
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) and Barlow (1987MNRAS.227..161B) d = Red data from Boroson & Liebert (1989ApJ...339..844B) e = New object. f = No density available, 1000cm-3 adopted.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
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
History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 27-Jun-2003
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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