Table 4
Regions in U Her’s H2O maser shell contributing emission to the prominent spectral components G (composed of G′ and G″ at Vlos∽−15 ± 0.5 km s−1) and D″ (Vlos~−18 km s−1).
| Map date | Xoff | Yoff | Vlos | Sv | Region | Instr. | Reference |
|---|---|---|---|---|---|---|---|
| [mas] | [mas] | [km s−1] | [Jy] | ||||
| 1988 Dec. | 5 | −46 | −14.7 | ~210 | SE | VLA | Bowers & Johnston (1994) |
| 1990 Feb. | 15 | −54 | −14.9 | 230.0 | SE | VLA | This paper, Table 3 |
| 1990 June | 15 | −52 | −15.0 | 145.0 | SE | VLA | This paper, Table 3 |
| 1990 June | 22 | −42 | −14.6 | 117.2 | SE | VLA | Colomer et al. (2000) |
| 1992 Dec. | 14 | −46 | −15.3 | 14.0 | SE | VLA | This paper, Table 3 |
| 1994 Apr. | 21 | −63 | −14.8 | 8.4 | SE | MERLIN | Richards et al. (2012) |
| 1994 Apr. | 21 | −46 | −14.8 | 2.2 | SE | MERLIN | Richards et al. (2012) |
| 1995 June | 23 | −55 | −14.8 | 4.1 | SE | VLBA | Marvel (1996) |
| 2000 May | – | – | – | n.d. | SE | MERLIN | Richards et al. (2012)(†) |
| 2001 Apr. | – | – | – | n.d. | SE | MERLIN | Richards et al. (2012)(†) |
| 1994 Apr. | −65 | −8 | −15.2 | 10.7 | W | MERLIN | Richards et al. (2012) |
| 1995 June | −36 | −21 | −15.5 | 10.6 | W | VLBA | Marvel (1996) |
| 2000 May | −50 | −2 | −15.0 | 141.0 | W | MERLIN | Richards et al. (2012) |
| 2001 Apr. | −59 | −8 | −15.9 | 38.0 | W | MERLIN | Richards et al. (2012) |
| 1988 Dec. | −8 | −51 | −17.6 | ~110 | SW | VLA | Bowers & Johnston (1994) |
| 1990 Feb. | −9 | −60 | −18.2 | 52.0 | SW | VLA | This paper, Table 3 |
| 1990 June | −9 | −60 | −18.1 | 7.3 | SW | VLA | This paper, Table 3 |
| 1990 June | −2 | −52 | −18.3 | 11.0 | SW | VLA | Colomer et al. (2000) |
| 1992 Dec. | −8 | −68 | −18.2 | 3.0 | SW | VLA | This paper, Table 3 |
| 1994 Apr. | −30 | −62 | −17.9 | 2.4 | SW | MERLIN | Richards et al. (2012)(††) |
| 1995 June | −26 | −44 | −17.9 | 2.0 | SW | VLBA | Marvel (1996)(††) |
| 2000 May | −69 | −13 | −17.8 | 12.3 | SW | MERLIN | Richards et al. (2012)(††) |
| 2001 Apr. | −17 | −15 | −17.9 | 4.7 | SW | MERLIN | Richards et al. (2012)(††) |
Notes. The position of the star in the maps presented by Colomer et al. (2000) and Marvel (1996) was set by us to (−20, +43) and (+35, +20) mas, respectively, relative to their map origin. (†)n.d. = not detected. The non-detection of component G in 2000/2001 means that it is not seen in the southeast quadrant anymore. (††)The spatial components in the southwest quadrant might have originated in different regions before and after 1993.
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