J/A+A/421/1087 CO abundance of 3 globules (Harjunpaa+, 2004)
The relationship of CO abundance to extinction and N(H2):
Observations of globules and the dependence on star formation activity.
Harjunpaa P., Lehtinen K., Haikala L.K.
<Astron. Astrophys. 421, 1087 (2004)>
=2004A&A...421.1087H 2004A&A...421.1087H
ADC_Keywords: Interstellar medium ; Molecular clouds ; Carbon monoxide
Keywords: ISM: general - ISM: abundances - ISM: molecules
Abstract:
We have studied the ratio of carbon monoxide column density to the
extinction AJ of background field stars in the direction of three
globules: B133, B335, L466. The N(CO) to AJ ratios were found to
vary from cloud to cloud so that they are larger in B335 than in B133
and L466. These variations are thought to primarily arise from
variations of the ratio N(CO)/N(H2).
Description:
The CO observations were made in three separate runs with the
Swedish-ESO Submillimetre Telescope (SEST) in October 1993, April
1994 and August 1998. The observed positions are listed in Table 1.
These positions were observed in the 12CO(J=1-0) line and in J=1-0
and J=2-1 transitions of 13CO and C18O. The half-power beamwidth
of the telescope at the frequencies of the CO(J=1-0) and CO(J=2-1)
lines is 45" and 23", respectively.
Objects:
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RA (2000) DE Designation(s)
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18 19 41.9 -06 04 40 L466 = LDN 466
19 06 10.0 -06 53 45 B133 = Barnard 133 = LDN 531
19 36 55.0 +07 34 24 B335 = Barnard 335 = LDN 663
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 40 35 Positions observed with SEST and the J band
extinctions
table1.tex 75 87 LaTeX version of table1
appena.dat 126 35 Line parameters
appena.tex 226 61 LaTeX version of appena
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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- 4 A4 --- Globule Globule name
6- 8 A3 --- Name Name of observed position
12- 13 I2 h RAh Right ascension (1950)
15- 16 I2 min RAm Right ascension (1950)
18- 21 F4.1 s RAs Right ascension (1950)
23 A1 --- DE- Declination sign (1950)
24 I1 deg DEd Declination (1950)
26- 27 I2 arcmin DEm Declination (1950)
29- 30 I2 arcsec DEs Declination (1950)
32- 35 F4.2 mag AJ Extinction in J band
37- 40 F4.2 mag e_AJ rms uncertainty on AJ
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Byte-by-byte Description of file: appena.dat
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Bytes Format Units Label Explanations
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2- 4 A3 --- Name Name of the observed position
7- 10 F4.2 K TR12CO1 Peak radiation temperature of
12CO(1-0) line (115.27GHz)
13- 16 F4.2 km/s FWHM12CO1 Line width (FWHM) of 12CO(1-0) line
19- 23 F5.2 K.km/s area12CO1 Integrated line area of 12CO(1-0) line
27- 30 F4.2 K TR12CO2 Peak radiation temperature of
12CO(2-1) line (230.54GHz)
33- 36 F4.2 km/s FWHM12CO2 Line width (FWHM) of 12CO(2-1) line
39- 43 F5.2 K.km/s area12CO2 Integrated line area of 12CO(2-1) line
47- 50 F4.2 K TR13CO1 Peak radiation temperature of
13CO(1-0) line (110.20GHz)
53- 56 F4.2 km/s FWHM13CO1 Line width (FWHM) of 13CO(1-0) line
59- 63 F5.2 K.km/s area13CO1 Integrated line area of 13CO(1-0) line
67- 70 F4.2 K TR13CO2 Peak radiation temperature of
13CO(2-1) line (220.40GHz)
73- 76 F4.2 km/s FWHM13CO2 Line width (FWHM) of 13CO(2-1) line
79- 83 F5.2 K.km/s area13CO2 Integrated line area of 13CO(2-1) line
87- 90 F4.2 K TRC18O1 Peak radiation temperature of
C18O(1-0) line (109.78GHz)
93- 96 F4.2 km/s FWHMC18O1 Line width (FWHM) of C18O(1-0) line
99-103 F5.2 K.km/s areaC18O1 Integrated line area of C18O(1-0) line
107-110 F4.2 K TRC18O2 Peak radiation temperature of
C18O(2-1) line (219.56GHz)
113-116 F4.2 km/s FWHMC18O2 Line width (FWHM) of C18O(2-1) line
119-123 F5.2 K.km/s areaC18O2 Integrated line area of C18O(2-1) line
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Acknowledgements: Paivi Harjunpaa
(End) Patricia Bauer [CDS] 30-Apr-2004