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Table 2

Observational measurements of water masers.

Star Date Dur Bm σrms ri ro υi υo ϵ NC NF Imax Nfit
(yymmdd) (hr) (mas) (mJyb-1) (AU) (km s-1) (Jy) (AU) (km s-1)
S Per1 940324 14.5 10 17 55 175 9.0 16 0.51 1040 93 72 18 ± 9 50 0.77 ± 0.29
S Per 990110 13.0 10    8 39 175 8.0 22 0.56 689 100 47 12 ± 6 56 0.91 ± 0.34
U Ori 940417 12.6 15 12 10 32 2.5 7.5 0.93 64 14 26 2.7 ± 1.8 2 0.65 ± 0.12
U Ori 990109 9.1 20 20 12 36 2.5 5.5 0.72 94 13 44 4.8 ± 2.6 6 0.51 ± 0.16
U Ori 000410 8.2 18 25 7 36 2.0 6.0 0.65 142 31 8 2.7 ± 2.2 5 0.46 ± 0.23
U Ori 010506 5.8 18 27 7 29 2.0 5.5 0.68 165 25 10 4.9 ± 4.4 10 0.74 ± 0.23
U Her 940413 13.7 15 14 13 47 4.0 9.5 0.69 126 34 22 2.3 ± 1.7 18 0.68 ± 0.35
U Her 000519 7.6 18 40 10 41 3.0 8.0 0.72 303 44 141 4.9 ± 4.4 22 0.71 ± 0.27
U Her 010427 6.1 18 35 10 41 3.0 8.0 0.72 212 37 38 3.9 ± 3.5 16 0.62 ± 0.32
IK Tau1 940415 11.0 15 10 16 66 5.0 16 0.82 742 256 25 2.0 ± 0.6 57 0.68 ± 0.28
IK Tau 000520 7.3 15 35 16 72 6.0 18 0.73 407 72 84 3.4 ± 3.1 36 0.98 ± 0.41
IK Tau 010427 3.9 15 40 16 72 6.0 18 0.73 175 40 24 3.2 ± 2.9 19 0.81 ± 0.31
RT Vir 940816 11.8 20 12 6 25 4.0 10 0.65 581 55 394 1.4 ± 0.6 40 1.04 ± 0.38
RT Vir 960405 4.5 12 25 5 19 3.5 11 0.81 389 58 389 1.2 ± 0.9 21 0.87 ± 0.37
RT Vir 960421 10.8 12 30 5 19 3.5 11 0.81 400 52 516 1.2 ± 0.9 20 0.90 ± 0.36
RT Vir 960429 11.5 12 15 5 19 3.5 11 0.81 450 50 526 0.9 ± 0.6 23 0.97 ± 0.41
RT Vir 960515 9.5 12 25 5 19 3.5 11 0.81 433 41 727 1.0 ± 0.8 20 1.05 ± 0.42
RT Vir 960524 7.7 12 20 5 19 3.5 11 0.81 401 51 706 0.9 ± 0.7 19 0.88 ± 0.31
RT Vir 960612 8.4 12 35 5 19 3.5 11 0.81 246 38 791 0.9 ± 0.6 19 0.80 ± 0.25

Notes. The first 5 columns give the target, date, duration, resolution and sensitivity of each observation. ri, ro, υi and υo are the inner and outer limits of the H2O maser shell. ϵ is the logarithmic velocity gradient (Sect. 3.1.4). The total number of individual maser components (NC) and features (NF) made up of contiguous series of components are given, along with the maximum total intensity Imax of the brightest spatially distinct component, is the mean size of each feature, Nfit is the number for which a Gaussian spectral profile could be fitted at  >3σ and is the mean FWHM of these. All observations used 0.105 km s-1 channel width apart from S Per epoch 990110 and IK Tau epochs 000520 and 010427, when 0.21 km s-1 was used. 1 NC, NF and υo are probably underestimates since the observational bandwidth was less than the likely velocity extent of emission.

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