Magnitude-range brightness variations of overactive K giants

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Volume 572 (December 2014)

A&A, 572 (2014) A94

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Table 8

Summary of the photometric characteristics, temperatures, and luminosities of IL Hya, XX Tri and DM UMa from V − I_C at maximum and minimum brightness.

Parameter	IL Hya	XX Tri	DM UMa

Cycle from V	trend + 9 + 14 yr	trend + 6 yr	trend + 17 yr
Cycle from B − V	...	yes	17 yr cycle
Cycle from U − B	...	yes	17 yr cycle
Cycle from V − I_C	trend+7 yr cycle	trend+6.5 yr cycle	small amplitude, uncertain
Total brightness change in V,V − I_C [mag]	0.9, 0.17 (0.25)^a	1.05, 0.3	0.65, ≈0.0^b
Change of the maxima in V,V − I_C [mag]	0.5, 0.12	0.6, 0.17	0.4, ≤0.05
Total change in m_bol [mag]	0.55	0.7	0.22
Change of the maxima in m_bol [mag]	0.36	0.46	0.09
Temperature change during rotation [K]	50−150	50−200	50−100
Temperature change of maxima [K]	210	190	70
Flux change from m_bol [%]	39	54	1
Flux change from T_eff [%]	20	16	5

Notes..

^(a)

The first two (uncertain) I-band data were measured in the Kron-Eggen system (see Sect. 2), which result in a much higher V − I_C amplitude. See text in Sect. 3.2

^(b)

For DM UMa, at low V brightness, there is no corresponding V − I_C data.

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