J/ApJ/669/446 Observations of SiO masers (Nakashima+, 2007)
Correlation between infrared colors and intensity ratios of SiO maser lines.
Nakashima J.-I., Deguchi S.
<Astrophys. J., 669, 446-458 (2007)>
=2007ApJ...669..446N 2007ApJ...669..446N
ADC_Keywords: Infrared sources ; Masers ; Stars, late-type ;
Photometry, infrared
Keywords: masers - stars: AGB and post-AGB - stars: late-type -
stars: mass loss - stars: statistics
Abstract:
We present the results of SiO millimeter line observations of a sample
of known SiO maser sources covering a wide dust temperature range. A
cold part of the sample was selected from the SiO maser sources found
in our recent SiO maser survey of cold dusty objects. The aim of the
present research is to investigate the causes of the correlation
between infrared colors and SiO maser intensity ratios among different
transition lines. In particular, the correlation between infrared
colors and SiO maser intensity ratio among the J=1-0 v=1, 2, and 3
lines are our main concern in this paper. We observed in total 75 SiO
maser sources with the Nobeyama 45m telescope quasi-simultaneously in
the SiO J=1-0 v=0, 1, 2, 3, 4 and J=2-1 v=1, 2 lines. We also observed
the sample in the 29SiO J=1-0 v=0 and J=2-1 v=0 lines, 30SiO J=1-0
v=0 line, and the H2O 61,6-52,3 line.
Description:
SiO line observations with the Nobeyama 45m telescope were made in
two separated periods: 2004 May 11-19 and 2006 February 15-19.
In the first period we observed, in total, 38 objects with the cooled
SIS-mixer receivers, S40 and S100. The frequency coverage of S40 and
S100 was roughly 500MHz.
In the second period we observed, in total, 53 objects with the HEMT
receiver H40 with a frequency coverage of roughly 2.0GHz.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 63 75 List of the Observing Targets
table3.dat 80 550 Results of line observations (for the 75 targets
plus W51)
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See also:
II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- IRAS IRAS name (HHMMm+DDMM)
12- 15 F4.1 mag Jmag 2MASS J magnitude
17- 20 F4.1 mag Hmag 2MASS H magnitude
22- 25 F4.1 mag Kmag 2MASS K magnitude
27- 32 F6.1 Jy F12um IRAS flux density at 12um
34- 39 F6.1 Jy F25um IRAS flux density at 25um
41- 45 F5.1 Jy Fa ?=- MSX flux density in A band (8.28um)
47- 52 F6.1 Jy Fc ?=- MSX flux in density in C band (12.13um)
54- 58 F5.1 Jy Fe ?=- MSX flux in density in E band (21.3um)
60- 63 F4.2 kpc Dist ?=- Luminosity distances to the target (1)
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Note (1): These luminosity distances were calculated from bolometric fluxes
obtained by integrating infrared fluxes given in Table 1 under the
assumption of 8000L☉, which is a typical absolute luminosity of
stellar SiO maser sources (e.g., Nakashima et al., 2000PASJ...52..275N 2000PASJ...52..275N)
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- IRAS IRAS name (HHMMm+DDMM)
12- 20 A9 --- OName Other name
22- 39 A18 --- Trans Observed transition
41- 45 F5.1 km/s VLSR ? Local standard of rest radial velocity
47- 52 F6.2 K TPeak ? Peak intensity
54 A1 --- l_S Limit flag on S
55- 61 F7.2 K.km/s S Velocity-integrated intensity
63- 67 F5.3 K rms The rms noise level
69- 80 A12 --- Obs.Date Date of the observation (YYYY/MM/DD.d)
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 16-Jan-2010