J/MNRAS/344/1 22GHz observations of VX Sgr (Murakawa+, 2003) ================================================================================ The radially expanding molecular outflow of VX Sagittarii. Murakawa K., Yates J.A., Richards A.M.S., Cohen R.J. =2003MNRAS.344....1M ================================================================================ ADC_Keywords: Stars, supergiant ; Masers Keywords: masers - circumstellar matter - stars: kinematics - stars: late-type - stars: mass-loss - radio lines: stars Abstract: We used MERLIN to observe 22-GHz H_2_O maser emission from the red supergiant VX Sgr in 1994 and 1999. The masers lie in a region 300-400mas in diameter. The angular size and the velocity distribution of the masers are similar at both epochs, although the total flux density in 1999 is only half of that seen in 1994. Description: The 22-GHz H_2_O maser emission from VX Sgr was observed on 1994 April 26 and 1999 January 16 for 5 and 7hr, respectively, in both left and right circular polarization, using 5 antennas of MERLIN. Objects: ------------------------------------------------- RA (2000) DE Designation(s) ------------------------------------------------- 18 08 04.05 -22 13 26.6 VX Sgr = HIP 88838 ------------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file tables1.dat 63 92 22GHz H_2_O maser features in the CSE of VX Sgr observed by MERLIN in 1994 tables2.dat 61 97 22GHz H_2_O maser features in the CSE of VX Sgr observed by MERLIN in 1999 tables3.dat 64 43 Summary of the proper motion analysis for common features between 1994 and 1999 -------------------------------------------------------------------------------- See also: J/ApJ/640/982 : 43GHz SiO maser features around VX Sgr (Chen+, 2006) J/A+A/524/A99 : Polarisation of S Per and VX Sgr in OH (Szymczak+, 2010) Byte-by-byte Description of file: tables1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- ID1 [1/92] ID number, 1994 observation 4- 8 F5.1 km/s Vlsr Flux-weighted mean LSR velocity 10- 12 F3.1 km/s DV Change in VLSR across the whole feature, {Delta}V 14- 17 F4.2 km/s DV1/2 Velocity FWHM, {Delta}V_1/2_ 19- 22 F4.2 km/s e_DV1/2 rms uncertainty on DV1/2 24- 29 F6.1 mas x Error-weighted centroid 31- 33 F3.1 mas e_x rms uncertainty on x 35- 40 F6.1 mas y Error-weighted centroid 42- 46 F5.2 mas e_y rms uncertainty on y 47- 54 F8.3 Jy P P flux density (in Jy/beam), at 22GHz 56- 60 F5.1 Jy.km/s S Integrated flux density, at 22GHz 62- 63 I2 --- ID2 [1/97]? ID number, 1999 observation -------------------------------------------------------------------------------- Byte-by-byte Description of file: tables2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- ID2 [1/97] ID number, 1999 observation 4- 8 F5.1 km/s Vlsr Flux-weighted mean LSR velocity 10- 12 F3.1 km/s DV Change in VLSR across the whole feature, {Delta}V 14- 17 F4.2 km/s DV1/2 Velocity FWHM, {Delta}V_1/2_ 19- 22 F4.2 km/s e_DV1/2 rms uncertainty on DV1/2 24- 29 F6.1 mas x Error-weighted centroid 31- 33 F3.1 mas e_x rms uncertainty on x 35- 40 F6.1 mas y Error-weighted centroid 42- 44 F3.1 mas e_y rms uncertainty on y 46- 52 F7.3 Jy P P flux density (in Jy/beam), at 22GHz 54- 58 F5.1 Jy.km/s S Integrated flux density, at 22GHz 60- 61 I2 --- ID1 [1/92]? ID number, 1994 observation -------------------------------------------------------------------------------- Byte-by-byte Description of file: tables3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- ID1 [1/92] ID number, 1994 observation 4- 5 I2 --- ID2 [1/97] ID number, 1999 observation 7- 11 F5.2 mas Delta Total angular separation between 1994 and 1999 13- 16 F4.2 mas e_Delta rms uncertainty on Delta 18- 23 F6.2 mas Da Radial component of the total angular separation between 1994 and 1999, {Delta}a 25- 28 F4.2 mas e_Da rms uncertainty on Da 30- 35 F6.2 mas Dtheta Tangential component of the total angular separation between 1994 and 1999 37- 41 F5.2 mas e_Dtheta rms uncertainty on e_Dtheta 43- 47 F5.1 km/s Va Radial component of the proper motion expansion velocity 49- 52 F4.1 km/s e_Va rms uncertainty on Va 54- 58 F5.1 km/s Vtheta Tangential component of the proper motion expansion velocity 60- 64 F5.1 km/s e_Vtheta rms uncertainty on Vtheta -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Patricia Vannier [CDS] 16-Jul-2012