Chromospheric activity and photospheric variation of α Ori during the great dimming event in 2020

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Table 2

Giants used for the transformation of the S_{II_TIGRE} into the Mount Wilson scale.

Object	T_eff [K]	log(g)	S_{II_MWO}	No. of S_{II_MWO}	S_{II_TIGRE}	TIGRE S_{II_MWO}	No. of S_{II_TIGRE}	Difference [%]
HD 4128	4800	2.5	0.38 ± 0.04	486	0.0167 ± 0.0013	0.422 ± 0.033	29	11.0
HD 6805	4600	2.5	0.229 ± 0.005	35	0.0089 ± 0.0003	0.238 ± 0.011	37	3.9
HD 6860	3800	1.5	0.536 ± 0.01	45	0.0212 ± 0.0013	0.528 ± 0.034	35	−1.4
HD 8512	4700	2.5	0.217 ± 0.006	45	0.008 ± 0.0003	0.216 ± 0.01	32	−0.4
HD 27371	5000	2.5	0.325 ± 0.043	774	0.0126 ± 0.0008	0.326 ± 0.022	57	0.4
HD 27697	5000	2.5	0.251 ± 0.011	777	0.0095 ± 0.0006	0.253 ± 0.017	56	1.1
HD 28305	4900	2.5	0.228 ± 0.006	741	0.0092 ± 0.0009	0.245 ± 0.022	32	7.4
HD 28307	5000	3.0	0.361 ± 0.02	725	0.0122 ± 0.0005	0.317 ± 0.015	33	−12.3
HD 29139	3900	1.0	0.446 ± 0.026	204	0.0169 ± 0.0005	0.428 ± 0.016	35	−4.1
HD 31398	4200	1.5	0.459 ± 0.021	320	0.0181 ± 0.0011	0.457 ± 0.028	28	−0.6
HD 39801	3600	0.0	0.542 ± 0.07	292	0.0212 ± 0.0018	0.528 ± 0.045	73	−2.6
HD 71369	5200	2.5	0.258 ± 0.003	398	0.0099 ± 0.0003	0.263 ± 0.011	71	1.8
HD 81797	4100	1.5	0.351 ± 0.029	66	0.0135 ± 0.0003	0.348 ± 0.013	41	−0.8
HD 82210	5300	3.5	0.643 ± 0.042	503	0.0272 ± 0.0015	0.671 ± 0.04	79	4.4
HD 96833	4600	2.5	0.23 ± 0.003	44	0.0085 ± 0.0002	0.228 ± 0.009	69	−0.8
HD 109379	5100	2.5	0.264 ± 0.005	99	0.01 ± 0.0003	0.265 ± 0.011	42	0.4
HD 111812	5600	3.0	0.727 ± 0.022	322	0.0299 ± 0.0008	0.735 ± 0.027	32	1.1
HD 115659	5100	2.5	0.278 ± 0.012	331	0.0106 ± 0.0003	0.279 ± 0.012	67	0.5
HD 164058	3900	1.5	0.407 ± 0.008	15	0.0139 ± 0.0017	0.357 ± 0.041	23	−12.4
HD 124897	4300	1.5	0.247 ± 0.004	917	0.0091 ± 0.0004	0.243 ± 0.012	72	−1.4
HD 159181	5200	1.5	0.69 ± 0.032	611	0.0296 ± 0.0006	0.728 ± 0.024	70	5.6
HD 186791	4200	1.5	0.505 ± 0.04	461	0.0196 ± 0.0006	0.492 ± 0.019	28	−2.5
HD 202109	4900	2.5	0.241 ± 0.011	222	0.0087 ± 0.0003	0.234 ± 0.01	68	−3.0
HD 205435	5100	3.0	0.477 ± 0.029	461	0.0164 ± 0.0012	0.417 ± 0.031	66	−12.7
HD 209750	5200	1.5	0.486 ± 0.024	543	0.0197 ± 0.0011	0.494 ± 0.03	52	1.7

Notes. The listed T_eff [K] and log(g) are the values for the PHOENIX spectrum that used for the TIGRE S -index estimation.

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