Spectra disentangling applied to the Hyades binary θ2 Tauri AB: new orbit, orbital parallax and component properties

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Table 5

Fundamental properties of θ² Tau A and B components.

Component A	This work	AM06	TSL97

T_eff,A (K)	7800 ± 170	–	8250¹
V_Asini (km s^-1)	68.4 ± 1.5	–	70¹
log (L/L_⊙)	1.77⁶ ± 0.05	1.74 ± 0.05	1.78 ± 0.07
M_A (M_⊙)	2.86 ± 0.06	2.15 ± 0.12	2.42 ± 0.30
M_V (mag)	0.33 ± 0.03	0.48 ± 0.05	0.37 ± 0.08
log g (cm s^-2)	3.6 ± 0.1	–	4.0¹

Component B	This work	AM06	TSL97

T_eff,B (K)	7800 ± 170	–	8250¹
V_Bsini (km s^-1)	113 ± 6	–	110 ± 4
log (L/L_⊙)	1.32⁶ ± 0.04	1.29 ± 0.06	1.34 ± 0.07
M_B (M_⊙)	2.16 ± 0.02	1.87 ± 0.11	2.11 ± 0.17
M_V (mag)	1.44 ± 0.03	1.61 ± 0.06	1.47 ± 0.08
log g (cm s^-2)	3.9 ± 0.1	–	4.5¹

	This work	AM06	TSL97

	0.754 ± 0.002	0.873³	0.873 ± 0.048
Δm_550 nm (mag)	1.11 ± 0.01⁴	1.12 ± 0.03	1.10 ± 0.01⁵
π_orb (mas)	20.90 ± 0.14	22.30 ± 0.36²	21.22 ± 0.76
σ_{π_orb} (%)	0.7	1.6	3.6
Tot. mass (M_⊙)	5.02 ± 0.12	4.03 ± 0.20	4.53 ± 0.51
σ_Sum (%)	2	5	11
Method used	VB-SB orbit	VB orbit + π_dyn	VB-SB orbit

Notes. The fundamental properties of θ² Tau A and B derived in this work (second column), by Armstrong et al. (2006) (third column) and by Torres et al. (1997) (fourth column) are described here. The listed uncertainties may be slightly different from the formal uncertainties in Table 3 as they take into account the increased error budget of K_B.

⁽¹⁾

Adopted.

⁽²⁾

de Bruijne et al. (2001).

⁽³⁾

from Torres et al. (1997).

⁽⁴⁾

from Eq. (2).

⁽⁵⁾

from Peterson et al. (1993).

⁽⁶⁾

M_Bol, ⊙ = 4.75 mag.

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