Table 1
Non-exhaustive history of the determination of the Baade-Wesselink projection factor in the case of δ Cep.
| Method | p | Reference |
|
|
||
| Geometrical models | ||
|
|
||
| Centroid | 1.415 | Getting (1934) |
| Centroid | 1.375 | van Hoof & Deurinck (1952) |
| Centroid | 1.360 | Burki et al. (1982) |
| Centroid | 1.328 | Neilson et al. (2012) |
|
|
||
| Hydrodynamical models | ||
|
|
||
| Bisector | 1.34 | Sabbey et al. (1995) |
| Gaussian | 1.27 ± 0.01 | Nardetto et al. (2004) |
| cc-g (Pp) | 1.25 ± 0.05 | Nardetto et al. (2009) |
|
|
||
| Observations | ||
|
|
||
| cc-g | 1.273 ± 0.021 ± 0.050 | Mérand et al. (2005) |
| cc-g | 1.245 ± 0.030 ± 0.050 | Groenewegen (2007) |
| cc-g | 1.290 ± 0.020 ± 0.050 | Merand et al. (2015) |
|
|
||
| cc-g (Pp) | 1.47 ± 0.05 | Gieren et al. (2005b) |
| cc-g (Pp) | 1.29 ± 0.06 | Laney & Joner (2009) |
| cc-g (Pp) | 1.41 ± 0.05 | Storm et al. (2011b) |
| cc-g (Pp) | 1.325 ± 0.03 | Groenewegen (2013) |
Notes. The method used to derive the radial velocity is indicated, and cc-g corresponds to a Gaussian fit of the cross-correlated line profile. For the values of the projection factor derived from a published period projection factor relation, we consistently use a period of P = 5.366208 days (Engle et al. 2014).
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