J/AJ/123/2772 OH-selected AGB and post-AGB objects. I. (Sevenster+, 2002)
OH-selected AGB and post-AGB objects. I. Infrared and maser properties.
Sevenster M.N.
<Astron. J. 123, 2772 (2002)>
=2002AJ....123.2772S 2002AJ....123.2772S
ADC_Keywords: Stars, giant ; Masers ; Infrared sources ; Radio sources ;
Spectroscopy
Keywords: stars: AGB and post-AGB
Abstract:
Using 766 compact objects found in a systematic survey of the Galactic
plane in the 1612MHz masing OH line, new light is cast on the IR
properties of evolved stars on the thermally pulsing asymptotic giant
branch (AGB) and beyond. The usual mid-IR selection criteria for
post-AGB, based on IRAS colors, largely fail to distinguish early
post-AGB stages. A two-color diagram from much narrower band MSX flux
densities, with bimodal distributions, provides a better tool for
doing this. Four mutually consistent selection criteria for OH-masing
red protoplanetary nebulae are given, as well as two for early
post-AGB masers and one for all post-AGB masers including the earliest
ones. All these criteria miss a group of blue, high-outflow post-AGB
sources with 60µm excess; these will be discussed in detail in
Paper II (Sevenster, 2002AJ....123.2772S 2002AJ....123.2772S). The majority of post-AGB
sources show regular double-peaked spectra in the OH 1612MHz line,
with fairly low outflow velocities, although the fractions of single
peaks and irregular spectra may vary with age and mass. The OH flux
density shows a fairly regular relation with the stellar flux and the
envelope optical depth, with the maser efficiency increasing with IRAS
color R21. The OH flux density is linearly correlated with the
60µm flux density.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
doublede.dat 89 318 OH double detections
lbv.dat 105 766 Final 766 sources data
tablevla.dat 131 286 VLA region
infrared.dat 171 766 Infrared data
vla/* . 775 *VLA spectra
atca/* . 18 ATCA spectra
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Note on vla/* : There are 9 spectra of objects that are not in tablevla.dat:
OH006.235-01.115, OH008.328-01.802, OH008.885-00.516, OH008.933-00.015,
OH009.055-00.156, OH009.334+00.129, OH009.575-02.032, OH009.877-00.128,
OH010.028-00.063
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See also:
J/A+AS/122/79 : Galactic Bulge Region OH 1612MHz survey. I. (Sevenster+ 1997)
J/A+AS/124/509 : ATCA/VLA OH 1612MHz survey. II. (Sevenster+ 1997)
Byte-by-byte Description of file: doublede.dat
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Bytes Format Units Label Explanations
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2- 17 A16 --- Name Source name, based on galactic coordinates
19- 20 I2 h RAh Right ascension (J2000)
22- 23 I2 min RAm Right ascension (J2000)
25- 30 F6.3 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- 43 F5.2 arcsec DEs Declination (J2000)
45- 50 F6.1 km/s Vlsr LSR velocity
52- 55 F4.1 km/s Vexp Expansion velocity
57- 62 F6.2 Jy Sblue Blue peak flux density
64- 69 F6.2 Jy Sred Red peak flux density
71- 80 A10 --- IRAS Name of nearest IRAS point source II/125
82- 87 F6.2 --- NIRAS Distance between OH pos and IRAS pos in
fractions of IRAS error ellipse in the
direction of the OH source
89 A1 --- Tel [ABVW] Telescope (1)
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Note (1): Telescope coded as follows:
A = for ATCA
V = for VLA
W = for VLA (also detected by ATCA)
(B and W sources are the same objects)
B = for ATCA (also detected by VLA)
(B and W sources are the same objects)
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Byte-by-byte Description of file: lbv.dat
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Bytes Format Units Label Explanations
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3- 9 F7.3 deg GLON [-46/45] Galactic longitude
12- 18 F7.3 deg GLAT Galactic latitude
20- 27 F8.3 km/s Vlsr LSR velocity
31- 36 F6.3 km/s Vout Outflow velocity
39- 45 F7.3 Jy Sblue Blue peak flux density
48- 54 F7.3 Jy Sred Red peak flux density
56- 79 A24 --- vla VLA spectrum name (vla/spectrumname)
81-105 A25 --- atca ATCA spectrum name (atca/spectrumname)
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Byte-by-byte Description of file: tablevla.dat
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Bytes Format Units Label Explanations
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2- 4 I3 --- Seq Source number
7- 22 A16 --- Name Source name, based on galactic coordinates
25 A1 --- Type Spectrum type (double/single/irregular)
28- 29 I2 h RAh Right ascension (J2000)
31- 32 I2 min RAm Right ascension (J2000)
34- 39 F6.3 s RAs Right ascension (J2000)
42 A1 --- DE- Declination sign (J2000)
43- 44 I2 deg DEd Declination (J2000)
46- 47 I2 arcmin DEm Declination (J2000)
49- 53 F5.2 arcsec DEs Declination (J2000)
56- 59 F4.2 arcsec Delta Theoretical positional error from IMFIT
(not practical)
61- 64 F4.1 arcmin Offset Offset from pointing centre
66- 71 F6.1 km/s Vlow Low velocity
73- 78 F6.1 km/s Vhigh High velocity
80- 85 F6.1 km/s Vc Central star velocity
89- 92 F4.1 km/s Vout Outflow velocity shell
96- 99 F4.1 Jy Slow Low flux density
102-106 F5.1 Jy Shigh High flux density
108-110 I3 mJy rms rms noise in empty cubes
112 A1 --- Ref [*+x-] Reference symbol OH
114-123 A10 --- IRAS Name of nearest IRAS point source II/125
125-131 F7.3 arcmin Dist Distance to IRAS PS (confidence radii)
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Byte-by-byte Description of file: infrared.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name OH name
18- 24 F7.3 deg GLON [-46/45] Galactic longitude
25- 31 F7.3 deg GLAT Galactic latitude
33- 38 F6.1 km/s Vlsr LSR velocity
40- 43 F4.1 km/s Vexp Expansion velocity
45- 50 F6.2 Jy Sblue blue peak flux
52- 57 F6.2 Jy Sred red peak flux
59- 68 A10 --- IRAS IRAS name
70- 75 F6.2 --- NIRAS Distance between OH pos and IRAS pos in
fractions of IRAS error ellipse IN THE
DIRECTION of the OH source
77- 83 F7.2 Jy S12um ? Flux density at 12µm if N<1.5 (1)
85- 91 F7.2 Jy S25um ? Flux density at 25µm if N<1.5 (1)
93-100 F8.2 Jy S60um ? Flux density at 60µm if N<1.5 (1)
102-109 F8.2 Jy S100um ? Flux density at 100µm if N<1.5 (1)
111-116 F6.2 Jy S4um ? MSX flux density at 4µm (B2 band)
if within 5" (1)
118-123 F6.2 Jy S8um ? MSX flux density at 8µm if within 5" (1)
125-131 F7.2 Jy S12umM ? MSX flux density at 12µm if within 5" (1)
133-139 F7.2 Jy S15um ? MSX flux density at 15µm if within 5" (1)
141-147 F7.2 Jy S21um ? MSX flux density at 21µm if within 5" (1)
149-155 F7.2 mag Jmag ? 2MASS J magnitude if within 3" (1)
157-163 F7.2 mag Hmag ? 2MASS H magnitude if within 3" (1)
165-171 F7.2 mag Kmag ? 2MASS Ks magnitude if within 3" (1)
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Note (1): Negative flux densities AND magnitudes indicate upper limits !
No data if no IR detection within specified distances
Limits are 3" for 2MASS, 5" for MSX, and N=1.5 for IRAS
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Byte-by-byte Description of file: vla/* atca/*
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Bytes Format Units Label Explanations
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1- 13 E13.6 km/s Vel Velocity
16- 28 E13.6 Jy Flux Flux
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References:
Sevenster, Paper II 2002AJ....123.2788S 2002AJ....123.2788S
History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 09-Jul-2002