Table 2
Results from the HD consistent model for the Vela X-1 donor star HD 77581.
| Quantity | GG2016a | HD models | ||
|---|---|---|---|---|
| Empirical | No LX | “Moderate”b | “Strong”c | |
| log (TX [K]) | 7 | – | 6.6 | 7, 8.9 |
| Xfill | 0.05 | – | 0.05 | 0.05, 2.0 |
| R0 [R*] | 1.2 | – | 1.2 | 1.2, 1.8 |
| log (LX [erg s−1]) | 33.7 | – | 33.4 | 36.9 |
| Rcrit [R*] | – | 1.34 | 1.33 | 1.30 |
| log (Ṁ [M⊙ yr−1]) | −6.20 | −6.19 | −6.18 | −6.07 |
| v∞ [km s−1] | 700 | 532 | 584 | 378 |
 |
2.20 | 2.12 | 2.14 | 1.94 |
 |
−12.12 | −11.94 | −11.99 | −11.60 |
| T2∕3 [kK] | 24.4 | 23.5 | 23.5 | 23.8 |
| log (g2∕3 [cm s−2]) | 2.79 | 2.69 | 2.70 | 2.72 |
 |
0.77 | 0.75 | 0.75 | 0.77 |
| Γe | 0.34 | 0.35 | 0.35 | 0.36 |
| η = Ṁv∞c∕L | 0.07 | 0.06 | 0.06 | 0.05 |
 |
28.7 | 28.6 | 28.6 | 28.6 |
Notes. (a) Empirical values derived by Giménez-García et al. (2016). (b) Moderate X-ray illumination of the donor wind with LX corresponding to eclipse measurement. (c) Strong X-ray illumination of the donor wind with LX corresponding to an unobscured NS situation. (d) Transformed radius Rt and wind strength parameter Qws, see Sect. 4.2 of Sander et al. (2017) for definitions and model usage. (e) Mean ionization parameter qion, as introduced in Sander et al. (2015). (f) Modified wind momentum in units of g cm s−2, defined as 
(see, e.g., Kudritzki & Puls 2000).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.