Table 1
Several important stellar, orbital and stellar-wind parameters of the η Car binary system and their values as determined by various studies.
| Parameter | Value | Reference |
|
|
||
| d | 2.3 ± 0.1 kpc | Davidson & Humphreys (1997) |
| P | 2024 ± 2 d | Corcoran et al. (2005) |
| i | 45° | Okazaki et al. (2008) |
| e | 0.9 | Smith et al. (2004) |
| Φ | 27° | Okazaki et al. (2008) |
| 0−30° | Parkin et al. (2009) | |
| a | 15.4 AU | Corcoran (2001) |
| M A | 90 M⊙ | Hillier et al. (2001) |
| M B | 30 M⊙ | Verner et al. (2005) |
| Ṁ A | 10-3M⊙ yr-1 | Hillier et al. (2001) |
| 2.5 × 10-4M⊙ yr-1 | Pittard & Corcoran (2002) | |
| Ṁ B | 10-5M⊙ yr-1 | Pittard & Corcoran (2002) |
| 1.5 × 10-5M⊙ yr-1 | Parkin et al. (2009) | |
| V ∞, A | 500 km s-1 | Hillier et al. (2001) |
| V ∞, B | 3000 km s-1 | Pittard & Corcoran (2002) |
Notes. P and d are the orbital period and the distance from the Earth. i, e and a are inclination angle, eccentricity and semi-major axis. The parameter Φ represents the angle between the projection of the orbital plane along the line of sight and the apastron side of the semi-major axis in the prograde direction: Φ = 270°−ω, with ω being the commonly used periastron longitude angle. M, Ṁ and V∞ are stellar mass, mass-loss rate and terminal velocity of the stellar wind for the stars A and B in the system.
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