Table 1
Stellar parameters for Sigma Ori AB (also known as 48 Ori, HD 37468, and HIP 26549) and calculated space velocity parameters.
| RA (J2000) | 05:38:44.768 | Caballero (2007) |
| Dec (J2000) | –02:36:00.25 | |
| Spectral type | O9.5V + B0.5 V | Hoffleit & Jaschek (1982) |
| L (log(L⋆/L⊙)) | 4.78 | Lee (1968) |
| log Q0 (s-1) | 47.88 | Martins et al. (2005a) |
| μα (mas yr-1) | 4.61 ± 0.88 | Perryman et al. (1997) a |
| μδ (mas yr-1) | –0.4 ± 0.53 | Perryman et al. (1997) |
| μα (km s-1) | 6.8 | |
| μδ (km s-1) | 5.7 | |
| vrad(LSR) (km s-1) | 11.45 | Caballero (2008) |
| d (pc) | 334 |
Caballero (2008) |
(M⊙ yr-1) |
8.0 × 10-8 | Howarth & Prinja (1989) |
| 2.0 × 10-10 | Najarro et al. (2011) | |
| v∞ (km s-1) | 1060 | Howarth & Prinja (1989) |
| 1500 | Najarro et al. (2011) | |
|
|
||
| θ (°) | 49.9 | This work |
| i (°) | 49.4 | |
| v⋆ (km s-1) | 15.1 | |
Notes. L is the luminosity of the star;
Q0 is the ionizing photon flux;
vrad is the radial velocity;
μα and
μδ are the
proper motions in RA and Dec, respectively; d is the measured
distance;
is the
mass-loss rate. The proper motion position angle θ is measured from
north to east; i is the inclination angle with respect to the
sky and v⋆ is the total
space velocity of σ Ori AB.
Values for proper motion published in van Leeuwen (2007) show a large discrepancy between different members σ Ori central cluster. Therefore, we adopt proper motion parameters from Perryman et al. (1997). In this case, proper motions between σ Ori AB are similar to the values for σ Ori D and σ Ori E listed in Caballero (2007).
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