Table 1
Parameters of stars GG Tau Aa, Ab1, and Ab2.
| Stellar parameter | Value | Ref. | |
|---|---|---|---|
| GG Tau Aa | |||
| Spectral type | M0 | 2 | |
| Effective temperature | TAa | 3700 K | 6 |
| Stellar luminosity | LAa | 0.38 L⊙ | 3 |
| Stellar accretion luminosity |  |
0.122 L⊙ | 3 |
| Visual extinction | AV | 0.3 | 3 |
| GG Tau Ab1 | |||
| Spectral type | M2V | 2 | |
| Effective temperature | TAb1 | 3300 K | 6 |
| Stellar luminosity | LAb1 | 0.133 L⊙ | 2,3 |
| Stellar accretion luminosity |  |
0.053 L⊙ | 2,3 |
| Visual extinction | AV | 0.45 | 3 |
| GG Tau Ab2 | |||
| Spectral type | M3V | 2 | |
| Effective temperature | TAb2 | 3100 K | 6 |
| Stellar luminosity | LAb2 | 0.067 L⊙ | 2,3 |
| Stellar accretion luminosity |  |
0.026 L⊙ | 2,3 |
| Visual extinction | AV | 0.45 | 4 |
| Position/Distance | |||
| Distance to GG Tau A | d | 140 pc | 2,5 |
| Inclination | i | 37° | 4 |
| Separation* (Aa → Ab) | rAab | 43 au | 2 |
| Separation* (Ab1 → Ab2) | rAb12 | 5 au | 2 |
| Position angle* | PAstars | 335° | 1 |
Notes. The parameters with (*) are de-projected to obtain the correct values for the model space (see Fig. 1). The definitions of the position angle and inclination are illustrated in Fig. 2.
References. (1) Yang et al. (2017); (2) Di Folco et al. (2014); (3) Hartigan & Kenyon (2003); (4) Duchêne et al. (2004); (5) White et al. (1999); (6) Kaler (1997).
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