Table 1
Comparison between Hipparcos,TGAS, and HST parallaxes.
| Name | IDHIPPARCOS* | ϖHIPPARCOS | σ ϖ HIPPARCOS | ϖ TGAS | σ ϖ TGAS | ϖ HST | σ ϖ HST | HST Reference |
| (mas) | (mas) | (mas) | (mas) | (mas) | (mas) | |||
|
|
||||||||
| Classical Cepheids | ||||||||
|
|
||||||||
| FF Aql** | 93124 | 2.110 | ± 0.330 | 1.640 | ±0.89 | 2.810 | ±0.180 | Benedict et al. (2007) |
| SS CMa | 36088 | 0.400 | ±1.780 | 0.686 | ±0.234 | 0.348 | ±0.038 | Casertano et al. (2016) |
| SY Aur | 24281 | –1.840 | ±1.720 | 0.687 | ±0.255 | 0.428 | ±0.054 | Riess et al. (2014) |
|
|
||||||||
| Type II Cepheids | ||||||||
|
|
||||||||
| VY Pyx | 434736 | 5.00 | ± 0.44 | 3.85 | ± 0.28 | 6.44 | ± 0.23 | Benedict et al. (2011) |
|
|
||||||||
| RR Lyrae stars | ||||||||
|
|
||||||||
| RR Lyr | 95497 | 3.46 | ±0.64 | 3.64 | ±0.23 | 3.77 | ±0.13 | Benedict et al. (2011) |
| RZ Cep | 111839 | 0.59 | ±1.48 | 2.65 | ±0.24 | 2.12 (2.54)*** | ±0.16 | Benedict et al. (2011) |
| SU Dra | 56734 | 0.20 | ±1.13 | 1.43 | ±0.29 | 1.42 | ±0.16 | Benedict et al. (2011) |
| UV Oct | 80990 | 2.44 | ±0.81 | 2.02 | ±0.22 | 1.71 | ±0.10 | Benedict et al. (2011) |
| XZ Cyg | 96112 | 2.29 | ±0.84 | 1.56 | ±0.23 | 1.67 | ±0.17 | Benedict et al. (2011) |
Notes.
Gallenne et al. (2012) have estimated the distance to FF Aql via the interferometric Baade-Wesselink technique; the corresponding parallax is 2.755 ± 0.554 mas.
Two different parallax values are provided for this star by Benedict et al. (2011); in the table we list both values.
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