Astronomy & Astrophysics

Table 2: Astrophysical data for HD 31993.
Parameter Value

Classification K2III, single star

Distance (Hipparcos) 238 ⁺⁸³_-49 pc

Luminosity, L 93 ⁺⁷⁶_-34 $L_\odot$

$\log g$ 2.5 ^+0.2_-0.4

Mass $1.9\pm0.3$ $M_\odot$

$T_{\rm eff}$ $4500\pm50$ K

$(B-V)_{\rm Hipparcos}$ $1.254\pm0.015$ mag

$(V-I)_{\rm Hipparcos}$ $1.21\pm0.02$ mag

$v\sin i$ $33.2\pm0.5$ km s^-1

Inclination, i $65\pm10$ $^\circ$

Period, $P_{\rm rot}$ $25.3\pm0.3$ days

Radius, R 18.3^+2.0_-1.1 $R_\odot$

Microturbulence, $\xi$ 2.0 km s^-1

Macroturbulence, $\zeta_{\rm R} = \zeta_{\rm T}$ 3.0 km s^-1

Abundance, Fe $\approx$ 7.7

Abundance, Ca $\approx$ 6.5

**Table 2:** Astrophysical data for HD 31993.
Parameter	Value
Classification	K2III, single star
Distance (Hipparcos)	238 ⁺⁸³_-49 pc
Luminosity, L	93 ⁺⁷⁶_-34 $L_\odot$
$\log g$	2.5 ^+0.2_-0.4
Mass	$1.9\pm0.3$ $M_\odot$
$T_{\rm eff}$	$4500\pm50$ K
$(B-V)_{\rm Hipparcos}$	$1.254\pm0.015$ mag
$(V-I)_{\rm Hipparcos}$	$1.21\pm0.02$ mag
$v\sin i$	$33.2\pm0.5$ km s^-1
Inclination, i	$65\pm10$ $^\circ$
Period, $P_{\rm rot}$	$25.3\pm0.3$ days
Radius, R	18.3^+2.0_-1.1 $R_\odot$
Microturbulence, $\xi$	2.0 km s^-1
Macroturbulence, $\zeta_{\rm R} = \zeta_{\rm T}$	3.0 km s^-1
Abundance, Fe	$\approx$ 7.7
Abundance, Ca	$\approx$ 6.5

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