Table 3
Properties of H2O masers.
| Star | Date |
|
TB0 min | TB0 max |
|
|
α | Nβ | β |
|
|
|||||||||
| S Per | 940324 | 4.5 × 1011 | 2.6 × 1006 | 3.5 × 1013 | –0.2 | 9 ± 6 | −1.6 ± 0.1 | 539 | 1.8 ± 0.1 |
| S Per | 990110 | 2.5 × 1011 | 3.6 × 1006 | 2.2 × 1013 | –0.2 | 13 ± 7 | −1.3 ± 0.1 | 195 | 1.0 ± 0.1 |
| U Ori | 940417 | 6.7 × 1009 | 3.1 × 1006 | 9.3 × 1010 | –0.4 | 10 ± 3 | 0.6 ± 0.1 | 15 | 0.8 ± 0.2 |
| U Ori | 990109 | 2.2 × 1012 | 2.7 × 1006 | 2.7 × 1013 | –0.2 | 2 ± 5 | −3.1 ± 0.2 | 14 | 0.4 ± 0.1 |
| U Ori | 000410 | 7.3 × 1008 | 2.4 × 1006 | 2.3 × 1010 | –1.7 | 8 ± 3 | 1.1 ± 0.2 | 6 | 0.8 ± 0.3 |
| U Ori | 010506 | 8.2 × 1008 | 3.0 × 1006 | 1.9 × 1010 | –3.2 | 10 ± 4 | 1.5 ± 0.1 | 52 | 0.9 ± 0.2 |
| U Her | 940413 | 3.7 × 1010 | 1.3 × 1006 | 5.7 × 1011 | –0.5 | 16 ± 7 | 1.6 ± 0.1 | 38 | 1.0 ± 0.1 |
| U Her | 000519 | 1.6 × 1011 | 5.3 × 1006 | 5.3 × 1012 | –0.5 | 13 ± 5 | 2.0 ± 0.1 | 101 | 1.2 ± 0.1 |
| U Her | 010427 | 2.4 × 1010 | 2.6 × 1006 | 7.1 × 1011 | –0.4 | 10 ± 5 | 0.8 ± 0.1 | 36 | 1.0 ± 0.3 |
| IK Tau | 940415 | 9.8 × 1007 | 2.2 × 1006 | 8.8 × 1009 | –4.4 | 12 ± 3 | 1.2 ± 0.1 | 141 | 1.0 ± 0.1 |
| IK Tau | 000520 | 3.4 × 1009 | 6.3 × 1006 | 1.4 × 1011 | –1.6 | 14 ± 3 | −3.4 ± 0.1 | 181 | 0.8 ± 0.1 |
| IK Tau | 010427 | 1.0 × 1010 | 6.0 × 1006 | 3.7 × 1011 | –1.2 | 14 ± 4 | −2.5 ± 0.1 | 67 | 1.0 ± 0.2 |
| RT Vir | 940816 | 5.1 × 1009 | 6.2 × 1006 | 2.0 × 1011 | –1.4 | 17 ± 2 | −1.1 ± 0.1 | 199 | 0.9 ± 0.1 |
| RT Vir | 960405 | 3.3 × 1009 | 8.1 × 1006 | 1.2 × 1011 | –0.7 | 21 ± 5 | −0.5 ± 0.1 | 106 | 0.8 ± 0.1 |
| RT Vir | 960421 | 3.5 × 1010 | 1.4 × 1007 | 8.1 × 1011 | –0.3 | 19 ± 4 | 0.1 ± 0.1 | 116 | 0.6 ± 0.1 |
| RT Vir | 960429 | 1.1 × 1012 | 1.1 × 1007 | 5.3 × 1013 | –0.2 | 23 ± 5 | −0.8 ± 0.1 | 172 | 0.8 ± 0.1 |
| RT Vir | 960515 | 8.1 × 1010 | 8.7 × 1006 | 2.1 × 1012 | –0.5 | 25 ± 4 | −0.4 ± 0.1 | 142 | 1.0 ± 0.1 |
| RT Vir | 960524 | 2.5 × 1010 | 9.4 × 1006 | 4.4 × 1011 | –0.6 | 25 ± 3 | −0.5 ± 0.1 | 154 | 0.9 ± 0.1 |
| RT Vir | 960612 | 2.2 × 1012 | 7.2 × 1007 | 5.4 × 1013 | –0.1 | 24 ± 6 | −1.0 ± 0.1 | 100 | 0.9 ± 0.1 |
Notes. All temperatures are in K. The brightness temperature TB0 was derived using Eq. (1). is the mean value for the peaks of all features in each source, given along with the minimum and maximum values for the feature peaks. The mean values of the maser excitation temperature and optical depth were derived as described in Sect. 3.2, which explains the uncertainties and dispersions; the given values are probably lower limits. α parametrises the relationship between component size and intensity for spherical, same-size clouds, as defined in Eq. (6). Nβ is the number of components for which the line profile fitting was better than 3σ, sυ > 3σs, sυ > s0 and the component lies within a feature velocity span of ≤ ΔVD. β parametrises the relationship between component size, position in the line profile and the effect of the internal velocity gradient see Eq. (A.2). Numbers in italics indicate unreliable results where < 30% of the data for that epoch meet these requirements.
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