J/A+A/538/A54 Spectroscopy of 12 [WC] planetary nebulae (Garcia-Rojas+, 2012)
Analysis of chemical abundances in planetary nebulae with [WC] central stars.
I. Line intensities and physical conditions.
Garcia-Rojas J., Pena M., Morisset C., Mesa-Delgado A., Ruiz M.T.
<Astron. Astrophys., 538, A54 (2012)>
=2012A&A...538A..54G 2012A&A...538A..54G
ADC_Keywords: Planetary nebulae ; Spectroscopy
Keywords: stars: AGB and post-AGB - ISM: abundances -
planetary nebulae: general - line: identification
Abstract:
Planetary nebulae (PNe) around Wolf-Rayet [WR] central stars ([WR]PNe)
constitute a particular photoionized nebula class that represents
about 10% of the PNe with classified central stars.
We analyse deep high-resolution spectrophotometric data of 12 [WR]
PNe. This sample of [WR]PNe represents the most extensive analysed so
far, at such high spectral resolution. We aim to select the optimal
physical conditions in the nebulae to be used in ionic abundance
calculations that will be presented in a forthcoming paper.
Description:
We acquired spectra at Las Campanas Observatory with the 6.5-m
telescope and the Magellan Inamori Kyocera (MIKE) spectrograph,
covering a wavelength range from 3350Å to 9400Å on September
2009 and June 2010. The spectra were exposed deep enough to detect,
with signal-to-noise ratio higher than three, the weak optical
recombination lines (ORLs) of OII, CII, and other species. We detect
and identify about 2980 emission lines, which, to date, is the most
complete set of spectrophotometric data published for this type of
objects. From our deep data, numerous diagnostic line ratios for Te
and ne are determined from collisionally excited lines (CELs), ORLs,
and continuum measurements (HI Paschen continuum in particular).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 95 12 Object characteristics and log of observations
(slit dimensions were always 1"x5")
hbeta.dat 50 12 Hβ fluxes and extinction coefficients
table3.dat 73 3276 Observed and reddening corrected line ratios
(F(Hβ)=100) and line identifications
--------------------------------------------------------------------------------
See also:
V/84 : Strasbourg-ESO Catalogue of Galactic Planetary Nebulae (Acker+, 1992)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- PNG PNG name (LLL.l+BB.b)
12- 19 A8 --- Name Name
21- 22 I2 h RAh Right ascension (J2000)
24- 25 I2 min RAm Right ascension (J2000)
27- 30 F4.1 s RAs Right ascension (J2000)
32 A1 --- DE- Declination sign (J2000)
33- 34 I2 deg DEd Declination (J2000)
36- 37 I2 arcmin DEm Declination (J2000)
39- 40 I2 arcsec DEs Declination (J2000)
42- 49 A8 --- SpType Spectral type
51 A1 --- l_T* Limit flag on T*
52- 54 I3 kK T* ? Star temperature (in 103K)
56- 65 A10 "DD-MM-YYYY" Obs.date Observation date
67- 87 A21 --- ExpTime Exposure time(s) (s, times x s)
89- 93 F5.3 --- AirMass Average air mass
95 I1 --- r_T* ? Reference for T* (1)
--------------------------------------------------------------------------------
Note (1): References as follows:
1 = Tylenda & Stasinska (1994A&A...288..897T 1994A&A...288..897T)
2 = Leuenhagen et al. (1996A&A...312..167L 1996A&A...312..167L)
3 = Zhang & Kwok (1993ApJS...88..137Z 1993ApJS...88..137Z)
4 = Koesterke & Hamann (1997IAUS..180..114K 1997IAUS..180..114K)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: hbeta.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- PNG PNG name (LLL.l+BB.b)
12- 19 A8 --- Name Name
22- 30 E9.4 cW/m2/nm F(Hb) Hβ flux, in erg/cm2/s/Å
32- 40 E9.4 mW/m2 I(Hb) Integrated dereddened Hβ flux,
(in erg/cm2/s)
42- 45 F4.2 --- c(Hb) Reddening coefficient at Hβ
47- 50 F4.2 --- e_c(Hb) Mean error on c(Hb)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Name Planetary nebula name
10- 16 F7.2 0.1nm lambda0 ? Adopted laboratory wavelength
18- 24 A7 --- Ion Ion designation
26- 33 A8 --- Mult Multiplet
35- 41 F7.2 0.1nm lambda ?=- Observed wavelength
43- 49 F7.2 km/s HRV ?=- Heliocentric radial velocity determined
for the line
51- 58 F8.3 --- F(lam) ?=- Observed flux relative to Hβ (1)
60- 67 F8.3 ---- I(lam) ?=- Dereddened flux relative to H{Hbeta} (2)
69- 70 I2 % e_I(lam) ?=- Observational 1σ error associated
with the line flux (3)
71 A1 --- u_I(lam) [:] Uncertainty flag on flux measurement
73 A1 --- Note [cdefg] Note (4)
--------------------------------------------------------------------------------
Note (1): in percentage of Hβ flux (i.e. Hβ=100); the
absolute fluxes can be derived from the "hbeta.dat" flie.
Note (2): in percentage of Hβ flux (i.e. Hβ=100); the
Hβ dereddened flux and reddening coefficient are given in
the "hbeta.dat" flie.
Note (3): The uncertainties in the flux measurement, the flux calibration,
and the error propagation in the reddening coefficient are included in
the observational error.
Note (4): Notes as follows:
c = Affected by telluric emission
d = Blended with an unknown line
e = Affected by charge transfer
f = Affected by atmospheric absorption bands
g = Partially blended with a strong emission line
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 03-Apr-2012