Table 1.
Stellar parameters.
| Source | L (L⊙) | Teff (K) | D (pc) | Ṁpd,d (M⊙ yr−1) | υexp,d (km s−1) | Rsh (") | ΔRsh (") |
|---|---|---|---|---|---|---|---|
| U Ant | 4000 | 2300 | 230 | 1 × 10−9 | 4 | 50 | 7.0 |
| DR Ser | 4000 | 2550 | 720 | 1 × 10−9 | 5 | 7.6 | 1.2 |
| V644 Sco | 4000 | 2315 | 760 | 1 × 10−9 | 5 | 9.4 | 2.0 |
Notes. The luminosities L and present-day dust-mass-loss rates (Ṁ) are assumed and are consistent with modelled upper limits (Schöier et al. 2005). Effective temperatures Teff and distances D are derived in the dust modelling. The dust-expansion velocities (υexp,d) are assumed to be the same as the gas-expansion velocities, and are taken from Schöier et al. (2005). The assumed shell radii Rsh and full-width-half-maximum (FWHM) ΔRsh are also given (from Ramstedt et al. 2011; Maercker et al. 2010, 2014).
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