Spot evolution on the red giant star XX Triangulum - A starspot-decay analysis based on time-series Doppler imaging

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Table 1

Astrophysical properties of XX Tri (HD 12545).

Parameter	Value	Based on

Classification, MK	K0III	Strassmeier (1999)
Distance, pc		van Leeuwen (2007)
V_max, mag	7.76	Oláh et al. (2014)
V − I_C, mag	1.18	Oláh et al. (2014)
Rotation period, d	≈24.0	Strassmeier (1999)
Orbital period, d	23.9674^a	radial velocities
Inclination, deg	60 ± 10	Strassmeier (1999)
vsini, km s^-1	19.9 ± 0.7	spectrum synthesis
Temperature, K	4,620 ± 30	spectrum synthesis
Log gravity, cgs	2.82 ± 0.04	spectrum synthesis
Metallicity, [Fe/H]_⊙	−0.13 ± 0.04	spectrum synthesis
Microturb., km s^-1	1.5	spectrum synthesis
Macroturb., km s^-1	3.0	spectrum synthesis
Radius, R_⊙	10.9 ± 1.2	from Rsini and i
Luminosity, L_⊙		from M_bol
Mass, M_⊙	1.26 ± 0.15	evolutionary tracks
Age, Gyr	7.7 ± 3.1	evolutionary tracks

Notes. Values not cited in the third column were obtained in this paper. Note that the errors for spectrum-synthesis related parameters are internal errors.

^(a)

±0.0005, see text.

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