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)|
|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|
|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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