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J/ApJ/669/424       H2O maser emissions of IRAS 19134+2131   (Imai+, 2007)

The spatio-kinematical structure and distance of the preplanetary nebula IRAS 19134+2131. Imai H., Sahai R., Morris M. <Astrophys. J., 669, 424-434 (2007)> =2007ApJ...669..424I
ADC_Keywords: Infrared sources ; Masers ; Proper motions ; Space velocities Keywords: masers - stars: AGB and post-AGB - stars: individual (IRAS 19134+2131) - stars: kinematics - stars: mass loss - stars: winds, outflows Abstract: Using the Very Long Baseline Array at six epochs, we have observed H2O maser emission in the preplanetary nebula IRAS 19134+2131 (I19134), in which the H2O maser spectrum has two groups of emission features separated in radial velocity by ∼100km/s. We also obtained optical images of I19134 with the Hubble Space Telescope to locate the bipolar reflection nebula in this source for the first time. Description: I19134 was imaged on UT date 2002 December 19 (GO program 9463) by the Wide Field Camera (WFC) of the Advanced Camera for Surveys (ACS), which has a plate scale of 0.05"/pi. Two dithered exposures of 338s each were obtained through each of the two filters (F606W, pivot wavelength lambda=0.599um and F814W, pivot wavelength lambda=0.806um). The VLBA observations were made at six epochs spanning the period from 2003 January 4 to 2004 April 26 (BI 25 and 28) Objects: --------------------------------------------------------------------- RA (2000) DE Designation(s) --------------------------------------------------------------------- 19 15 35.2 +21 36 34 IRAS 19134+2131 = 2MASS J19153520+2136340 --------------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 60 114 Parameters of the detected H2O maser features table3.dat 72 20 Relative and absolute proper motions of H2O maser features
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 10 A10 "YYYY/MM/DD" Date Observation date 12- 18 F7.2 km/s VLSR LSR velocity at the intensity peak 20- 27 F8.3 mas oRA Offset in right ascension (1) 29- 33 F5.3 mas e_oRA rms uncertainty on oRA 35- 41 F7.3 mas oDE Offset in Declination (1) 43- 47 F5.3 mas e_oDE rms uncertainty on oDE 49- 52 F4.2 Jy Ipeak Peak intensity of the feature (Jy/beam) 54- 57 F4.2 km/s DV Full velocity width of maser emission (2) 59- 60 I2 --- Feat ? Feature number listed in table3 (G1)
Note (1): Position offset with respect to the delay-tracking center at data correlation (RA=19:15:35.2150, DE=+21:36:33.900, J2000) Note (2): The minimum is equal to the velocity spacing of a spectral channel (0.21km/s).
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Feat Feature number (G1) 4- 10 F7.2 mas oRA Offset in right ascension from Feat#16 (1) 12- 16 F5.2 mas oDE Offset in Declination from Feat#16 (1) 18- 22 F5.2 mas/yr pmX Relative proper motion along X (2) 24- 27 F4.2 mas/yr e_pmX rms uncertainty on pmX 29- 33 F5.2 mas/yr pmY Relative proper motion along Y (2) 35- 38 F4.2 mas/yr e_pmY rms uncertainty on pmY 40- 44 F5.2 mas/yr PMX Absolute proper motion along X 46- 49 F4.2 mas/yr e_PMX rms uncertainty on PMX 51- 55 F5.2 mas/yr PMY Absolute proper motion along Y 57- 60 F4.2 mas/yr e_PMY rms uncertainty on PMY 62- 67 F6.2 km/s VZ Radial motion (3) 69- 72 F4.2 km/s e_VZ rms uncertainty on VZ (3)
Note (1): Relative value with respect to the location of the position-reference maser feature: IRAS 19134+2131:I2007 16. Note (2): Relative value with respect to the motion of the position-reference maser feature: IRAS 19134+2131:I2007 16. Note (3): Relative value with respect to the adopted systemic velocity VLSR=-67km/s.
Global notes: Note (G1): Identification of the maser feature. The feature is designated as IRAS 19134+2131:I2007 NN, where NN is the ordinal source number given in this column (I2007 stands for sources found by Imai et al., 2007, IAU Symp, 242, and listed therein). I2007 IRAS 19134+2131 NN in Simbad.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 15-Jan-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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