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Table 2

Observational parameters and measurements of 22-GHz masers.

Star Date θB σrms ri ro vi vo ϵ Kgrad NC NF Nprev Imax
(yymmdd) mas2 mJy b-1 (AU) (km s-1) (km s-1 AU-1) (Jy) (AU) (km s-1)
VX Sgr 940426 40·20 51 85 350 9.0 20.0 0.57 0.04 520 92 – 294 14 ± 3 1.3 ± 0.3
VX Sgr 990116 40·20 42 95 355 10.0 20.5 0.54 0.04 497 97 42 102 12 ± 4 1.1 ± 0.5
S Per1 940324 10·10 17 55 175 9.0 16 0.51 0.06 1040 93 – 72 18 ± 9 0.8 ± 0.3
S Per 990110 10·10 8 30 165 8.5 22 0.56 0.23 689 100 40 47 12 ± 6 0.9 ± 0.3
U Ori 940417 15·15 12 10 32 2.5 7.0 0.88 0.20 95 14 – 26 2.7 ± 2.6 0.6 ± 0.1
U Ori 990109 20·20 20 12 36 2.5 5.5 0.72 0.13 94 12 – 44 4.8 ± 3.1 0.5 ± 0.2
U Oriφ 000410 18·18 25 7 36 2.0 6.0 0.65 0.14 187 33 0 8 2.7 ± 1.5 0.5 ± 0.2
U Oriφ 010506 18·18 27 7 29 2.0 5.5 0.68 0.16 212 25 9 10 4.9 ± 2.0 0.7 ± 0.3
U Her 940413 15·15 14 13 47 4.0 9.5 0.69 0.16 282 34 – 22 2.3 ± 1.3 0.7 ± 0.4
U Her 000519 18·18 40 10 41 3.0 8.0 0.72 0.16 412 48 – 141 4.4 ± 2.0 0.6 ± 0.3
U Herφ 010427 18·18 35 10 41 3.0 8.0 0.72 0.16 324 36 20 38 3.8 ± 1.9 0.6 ± 0.3
IK Tau1 940415 15·15 10 16 66 5.0 16 0.82 0.22 1490 256 – 25 2.0 ± 1.3 0.7 ± 0.3
IK Tauφ 000520 15·15 35 16 72 6.0 18 0.73 0.21 502 72 – 84 3.4 ± 1.8 1.0 ± 0.4
IK Tauφ 010427 15·15 40 20 72 6.0 18 0.73 0.21 236 40 24 24 3.2 ± 2.0 0.8 ± 0.3
RT Vir 940416 20·20 12 6 25 4.0 10 0.65 0.32 847 55 – 394 1.4 ± 1.0 1.0 ± 0.4
RT Vir 960405 12·12 25 4.5 19 3.5 11 0.80 0.52 494 59 – 389 1.2 ± 0.9 0.9 ± 0.4
RT Vir 960421 12·12 30 4.5 19 3.5 11 0.80 0.52 512 52 23 516 1.2 ± 0.8 0.9 ± 0.4
RT Vir 960429 12·12 15 4.5 19 3.5 11 0.80 0.52 586 50 25 526 0.9 ± 0.5 1.0 ± 0.4
RT Vir 960515 12·12 25 4.5 19 3.5 11 0.80 0.52 551 41 33 727 1.0 ± 0.7 1.1 ± 0.4
RT Vir 960524 12·12 20 4.5 19 3.5 11 0.80 0.52 483 51 36 706 0.9 ± 0.8 0.9 ± 0.3
RT Vir 960612 12·12 35 4.5 19 3.5 11 0.80 0.52 433 38 29 791 0.9 ± 0.6 0.8 ± 0.3
W Hyaφ 990209 50·35 65 6 25 3.5 5.5 0.31 0.11 216 29 – 32 1.5 ± 1.0 0.8 ± 0.3
W Hyaφ 000405 25·25 55 6 25 3.5 5.5 0.31 0.11 152 17 5 95 1.2 ± 0.9 0.6 ± 0.2
W Hyaφ 010430 25·25 40 7 16 3.5 5.5 0.55 0.22 147 18 7 137 1.5 ± 1.1 0.6 ± 0.2
W Hyaφ 020405 28·22 50 6 16 3.5 5.5 0.46 0.20 125 16 9 268 1.3 ± 1.0 0.7 ± 0.1

Notes.  Epochs when phase referencing was attempted are marked φ. θB is the restoring beam used (major axis N–S). σrms is the noise in channels which are not dynamic-range limited. ri, ro, vi and vo are the radii and expansion velocities of the inner and outer maser shell limits, ϵ is the logarithmic velocity gradient and Kgrad is the velocity gradient. The total number of individual maser components (NC) and features (NF) made up of contiguous series of components are given. Nprev is the number of features matched with a previous epoch, see Sect. 2.1. Imax is the maximum total intensity of the brightest component. is the mean feature size, and is the mean FWHM of those features to which a Gaussian spectral profile could be fitted at  ≥ 3σ.

(1)

Denotes epochs where the bandwidth was probably slightly less than the total velocity extent of the source.

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