J/MNRAS/390/1733 CN column densities and excitation temperatures (Slyk+, 2008)
CN column densities and excitation temperatures.
Slyk K., Bondar A.V., Galazutdinov G.A., Krelowski J.
<Mon. Not. R. Astron. Soc., 390, 1733-1750 (2008)>
=2008MNRAS.390.1733S 2008MNRAS.390.1733S
ADC_Keywords: Stars, nearby ; Spectroscopy ; Equivalent widths
Keywords: ISM: clouds - ISM: molecules
Abstract:
We analyse abundances and rotational temperatures of the interstellar
CN molecule. We have calculated the column densities and excitation
temperatures of the molecule along 73 lines of sight basing on our
original measurements of the B2{SIGMA}+-X2{SIGMA}+(0,0)
vibrational band recorded in high signal-to-noise ratio spectra and
also for 88 directions based on measurements already available in
literature. We compare the column densities obtained from different
bands of CN molecule available to ground-based instruments. The
obtained excitation temperatures in the analysed directions show
always an excess over the cosmic microwave background radiation (CMBR)
temperature.
Description:
The spectra, analysed in this project, were acquired using several
instruments.
* (i) FEROS echelle spectrograph fed with the 2.2-m telescope at ESO
La Silla which allows resolution R=48000. (34 spectra)
* (ii) UVES instrument attached to the ESO VLT Kueyen telescope
(R=80000) available from the UVES Paranal Observatory Project - a
public library of high-resolution stellar spectra (Bagnulo et al.
2003, The ESO Messenger, 114, 10), and the ESO archive. (21 spectra)
* (iii) BOES - the echelle spectrograph installed at the 1.8-m
telescope of Bohyunsan Optical Astronomy Observatory in South Korea
working with three possible resolutions: R=30000, 45000 and 90000. (11
spectra)
* (iv) MAESTRO - the coude echelle spectrometer fed by the 2-m telescope
of the Observatory at the Peak Terskol (Northern Caucasus), with the
resolution R=120000. (seven spectra)
* (v) HARPS spectrograph attached to the ESO La Silla 3.6-m telescope,
a fibre-fed high-resolution echelle spectrograph R=115000. (seven
spectra)
* (vi) Gecko spectrograph on the 3.6-m Canada-France-Hawaii Telescope
(CFHT) (R=120000). (six spectra)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 39 73 The list of observed stars
table2.dat 94 93 Equivalent width measurements of CN B-X (0,0) band
and CH 3886 and 4300 lines for observed stars
table3.dat 102 87 *Literature data of equivalent width measurements
of CN B-X (0,0) band and CH 3886 and 4300 lines
table5.dat 117 101 *CN column densities and excitation temperatures
for observed stars
table6.dat 117 88 *CN column densities and excitation temperatures
based on the measurements from the literature
refs.dat 73 18 References
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Note on table5.dat: HD 151962 corrected into HD 151932.
Note on table3.dat, table6.dat: the four star names starting by CD
corrected into CP (actually CPD star identifiers, not CD)
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Star Star name
12- 22 A11 --- SpType MK spectral type
24- 28 F5.2 mag vmag Visual apparent magnitude
30- 33 F4.2 mag E(B-V) ? B-V colour excess
35- 39 A5 --- Sp Spectrograph used (G1)
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Byte-by-byte Description of file: table[23].dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Star Star name
12 I1 --- f_Star ? Observation number
13 A1 --- n_Star [i] i for the "directions for which we have
our original measurements"
14 A1 --- Sp Spectrograph (G1)
15 A1 --- l_EWR1 Limit flag on EWR1
16- 21 F6.3 0.1pm EWR1 ?=- R(1) equivalent width
23- 27 F5.3 0.1pm e_EWR1 ?=- rms uncertainty on R1
29 A1 --- l_EWR0 Limit flag on EWR0
30- 35 F6.3 0.1pm EWR0 ?=- R(0) equivalent width
37- 41 F5.3 0.1pm e_EWR0 ?=- rms uncertainty on R0
43- 44 A2 --- l_EWP1 [≤ ] Limit flag on EWP1
45- 50 F6.3 0.1pm EWP1 ?=- P(1) equivalent width
52- 56 F5.3 0.1pm e_EWP1 ?=- rms uncertainty on P1
58- 62 F5.2 0.1pm EWCH3886 ?=- CH3886 equivalent width
64- 66 F3.1 0.1pm e_EWCH3886 ?=- rms uncertainty on CH3886
68- 72 F5.2 0.1pm EWCH4300 ?=- CH4300 equivalent width
73- 76 F4.1 0.1pm e_EWCH4300 ?=- rms uncertainty on CH4300
79- 82 F4.2 km/s b(CH) ?=- b parameter of CH lines
84- 89 F6.2 10+12cm-2 N(CH) ?=- Lower limit of CH column density
obtained from CH 3886 line
90 A1 --- l_N(CN)tot Limit flag on N(CN)tot
91- 96 F6.2 10+12cm-2 N(CN)tot ? Total CN column density (table3 only)
98-102 A5 --- Ref References for table3, in refs.dat file
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Byte-by-byte Description of file: table[56].dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Star Star name
11 A1 --- Sp Spectrograph (G1)
13 I1 --- f_Star ? Observation number
15- 18 F4.2 --- DR ?=- Doublet ratio
20- 25 F6.3 km/s bDR ?=- Doppler broadening parameter b from
doublet ratio method
26 A1 --- r_bDR Reference for bDR (1)
28- 31 F4.2 km/s b ?=- Doppler broadening parameter b from
rescaling the CH b parameter
33- 37 F5.2 10+12cm-2 NR1DR ?=- Column density of the upper state of CN
38 A1 --- n_NR1DR [b] b for Final value
39- 45 F7.2 10+12cm-2 NR0DR ?=- Column density of the lower state of CN
46 A1 --- n_NR0DR [b] b for Final value
47 A1 --- f_NR0DR [i] i for infinity
48- 52 F5.2 K TDR ?=- Excitation temperature from doublet
ratio method
53 A1 --- n_TDR [b] b for Final value
54- 58 F5.2 10+12cm-2 NR1CH ?=- Column density of the upper state of CN
59 A1 --- n_NR1CH [b] b for Final value
60- 65 F6.2 10+12cm-2 NR0CH ?=- Column density of the lower state of CN
66 A1 --- n_NR0CH [b] b for Final value
67- 70 F4.2 K TCH ?=- Excitation temperature from
rescaling CH b parameter
71 A1 --- n_TCH [b] b for Final value
72- 76 F5.2 10+12cm-2 NR1b=1 ?=- Column density of the upper state of CN
for b=1km/s
77 A1 --- n_NR1b=1 [b] b for Final value
78 A1 --- f_NR1b=1 [i] i for infinity
79- 84 F6.2 10+12cm-2 NR0b=1 ?=- Column density of the lower state of CN
for b=1km/s
85 A1 --- n_NR0b=1 [b] b for Final value
86 A1 --- f_NR0b=1 [ic] i=infinity, c=from CN A-X (2,0) band
89- 92 F4.2 K Tb=1 ?=- Excitation temperature of CN for
b=1km/s
93 A1 --- n_Tb=1 [b] b for Final value
95- 99 F5.2 10+12cm-2 NR1b=inf ?=- Column density of the upper state of CN
in the limit of unsaturated lines
for line R1
101-105 F5.2 10+12cm-2 NR0b=inf ?=- Column density of the lower state of CN
in the limit of unsaturated lines
for line R0
107-112 F6.3 10+12cm-2 NP1b=inf ?=- Column density of the lower state of CN
in the limit of unsaturated lines
for line P1
114-117 F4.2 K Tb=inf ?=- Excitation temperature in the limit of
unsaturated lines
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Note (1): b values adopted from the following references:
a = Meyer & Jura (1985ApJ...297..119M 1985ApJ...297..119M)
b = Roth & Meyer (1995ApJ...441..129R 1995ApJ...441..129R)
c = Federman & Lambert (1988ApJ...328..777F 1988ApJ...328..777F)
d = Crutcher (1985ApJ...288..604C 1985ApJ...288..604C)
e = Pan et al. (2004ApJS..151..313P 2004ApJS..151..313P)
f = Palazzi et al. (1992ApJ...398...53P 1992ApJ...398...53P)
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode resuming the reference
24- 51 A28 --- Aut Author's name
53- 73 A21 --- Com Comment
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Global notes:
Note (G1): Spectrograph flag as follows:
m = MAESTRO
b = BOES
g = Gecko
f = FEROS
u = UVES
h = HARPS
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History:
* 17-May-2010: From electronic version of the journal
* 26-Jul-2010: CD identifiers from tables 3 and 6 corrected into CP
(actually CPD identifiers)
(End) Patricia Vannier, Francois Ochsenbein [CDS] 17-May-2010