Four decades of photometry of XX Trianguli, ‘the most spotted star’ in the sky

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Table 1.

Relevant astrophysical data of XX Tri adopted from Paper I.

Parameter	Value
Spectral type	K0III
Distance [pc]	196.3 ± 1.1
V_br [mag]	7.64
Average V − I_C [mag]	1.18
P_rot [d]^a	23.470 − 24.716
P_orb [d]	23.9674 ± 0.0005
Inclination [°]	60 ± 10
v sin i [ kms⁻¹]	20.0 ± 0.6
T_eff [K]^b	4627±26
log g (cgs)	2.82 ± 0.05
Metallicity [Fe/H]	−0.13±0.04
Radius [R_⊙]^c	$10 . 95_{- 0.95}^{+ 1.4}$ $10.95^{+1.4}_{-0.95}$
Radius [R_⊙]^d	8.95 ± 0.23
Luminosity [L_⊙]^d	337 ± 2
Mass [M_⊙]	$1 . 1_{- 0.3}^{+ 0.2}$ $1.1^{+0.2}_{-0.3}$
Age [Gyr]	$7 . 4_{- 3.2}^{+ 2.3}$ $7.4^{+2.3}_{-3.2}$

Notes.

^(a)

This paper, extreme values, cf. Fig. 2 and Table 2.

^(b)

From fitting 16 years’ of spectroscopic data with synthetic spectra.

^(c)

Derived from v sin i, P_rot, and i.

^(d)

Derived from V_br, T_eff, and Gaia DR3 parallax.

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