J/ApJS/160/272 A CO survey of young planetary nebulae (Huggins+, 2005)
A CO survey of young planetary nebulae.
Huggins P.J., Bachiller R., Planesas P., Forveille T., Cox P.
<Astrophys. J. Suppl. Ser., 160, 272-285 (2005)>
=2005ApJS..160..272H 2005ApJS..160..272H
ADC_Keywords: Nebulae, planetary ; Radio lines ; Surveys
Keywords: circumstellar matter - planetary nebulae: general -
radio lines: stars - stars: AGB and post-AGB - stars: mass loss
Abstract:
We report the results of a sensitive survey of young planetary nebulae
in the CO J=2-1 line that significantly increases the available data
on warm, dense, molecular gas in the early phases of planetary nebula
formation. The observations were made using the IRAM 30m telescope
with the 3x3 pixel Heterodyne Receiver Array (HERA). The array
provides an effective means of discriminating the CO emission of
planetary nebulae in the Galactic plane from contaminating emission of
interstellar clouds along the line of sight. A total of 110 planetary
nebulae were observed in the survey, and 40 were detected. The results
increase the number of young planetary nebulae with known CO emission
by approximately a factor of 2. The CO spectra yield radial velocities
for the detected nebulae, about half of which have uncertain or no
velocity measurements at optical wavelengths. The CO profiles range
from parabolic to double-peaked, tracing the evolution of structure in
the molecular gas. The line widths are significantly larger than on
the asymptotic giant branch, and many of the lines show extended
wings, which probably result from the effects on the envelopes of
high-velocity jets.
Description:
The survey observations were made in the CO J=2-1 line at 230.538GHz
using the IRAM 30m telescope at Pico Veleta, Spain, in 2002 March and
2003 May.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 73 110 CO Survey of young planetary nebulae
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See also:
J/A+AS/132/13 : Planetary nebulae radial velocities (Durand+ 1998)
V/84 : Strasbourg-ESO Catalogue of Galactic Planetary Nebulae
(Acker+ 1992)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- PNG PN name based on galactic coordinates
(PN GLLL.l+LL.l in Simbad) (1)
12- 20 A9 --- Name Common name
22- 23 I2 mK RMS The RMS noise level of the observation
25- 30 F6.2 K.km/s Int ? CO Integrated line intensity
32- 35 I4 km/s HRV ? CO Heliocentric systemic velocity
37 A1 --- l_WCO Limit flag on DelV
38- 39 I2 km/s WCO ? CO line width at zero intensity
41- 44 I4 mK Tpeak ? CO Peak line temperature
47- 50 I4 km/s ISV1l ? Heliocentric velocity interval over which
there is significant interstellar
contamination, lower value
52- 54 I3 km/s ISV1u ? Heliocentric velocity interval over which
there is significant interstellar
contamination, upper value
56- 58 I3 km/s ISV2l ? Heliocentric velocity interval over which
there is significant interstellar
contamination, lower value
60- 63 I4 km/s ISV2u ? Heliocentric velocity interval over which
there is significant interstellar
contamination, upper value
65- 72 A8 --- Com Additional comments (2)
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Note (1): Ordered by galactic longitude.
Note (2): Additional comments, defined as follows:
d = detection;
n = non-detection;
t = tentative detection;
g1-4 = spectroscopic group;
s = severe interstellar contamination.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 20-Dec-2005