Table B.2:

Accurate Hvar all-sky mean values for all comparison stars used. These were added to the magnitude differences var.-comp. and check-comp. for data from all stations. For comparison, also the magnitudes of 126 Tau from all-sky photometry by Johnson et al. (1966) and from 8C all-sky photometry by Johnson et al. (1967) transformed to by us.

Station	Star	HD	No. of	V	B	U	(B-V)	(U-B)
			obs.	(mag.)	(mag.)	(mag.)	(mag.)	(mag.)
01	HR 1860	36589	741	6.211 0.010	6.180 0.011	5.788 0.013	-0.031	-0.392
01	126 Tau	37711	635	4.853 0.011	4.728 0.012	4.086 0.014	-0.125	-0.642
01	121 Tau	36819	149	5.385 0.013	5.305 0.013	4.677 0.016	-0.080	-0.628
23	126 Tau	37711	3	4.862 0.028	4.743 0.033	4.108 0.045	-0.119	-0.635
30	126 Tau	37711	2	4.857 0.003	4.716 0.004	4.052 0.006	-0.141	-0.664

Photoelectric observations used in this study consist of numerous UBV, BV and V photometric measurements (or measurements in other photometric systems which we were able to transform to the Johnson system) from 14 different observatories. We used only those published data for which accurate dates of observations are known. The observations span an interval 1961-2007 and consist of both, already published observations and new data obtained by us. Basic information is provided in Table B.1. As seen there, most of the available data sets were secured differentially, relative to either HR 1860 = HD 36819 or 126 Tau = HD 37711 and there are also three data sets based on all-sky photometry.

Special effort was made to derive improved all-sky values for all comparison stars used, employing carefully standardized UBVobservations secured at Hvar over several decades of systematic observations. The new values are collected in Table B.2, together with the number of all-sky observations and the rms errors. They were added to the respective magnitude differences to obtain directly comparable standard magnitudes for all stations. We did our best to reduce all the data to the standard Johnson system. How well this was possible is explained in the detailed comments on individual data sets below where we provide also other useful pieces of information. It can also be judged by inspecting Table B.3 where we provide the mean magnitudes of the check stars observed at individual stations derived relatively to the Hvar all-sky values for HR 1860 or 126 Tau.

Hvar, Ondrejov, Limber, Sarajevo and Xing-Long observations were secured during an international campaign on photometry of Be stars (Harmanec et al. 1982). Those observations were reduced to the standard system using the HEC22 computer code (Harmanec & Horn 1998).

 

 

Table B.3: Mean values for the check stars used at individual observing stations derived differentially relative to their respective comparison stars (cf. Table B.1). They illustrate how closely the data could be transformed to a comparable standard system.

Station	Star	HD	No. of	V	B	U	(B-V)	(U-B)
			obs.	(mag.)	(mag.)	(mag.)	(mag.)	(mag.)
01	126 Tau	37711	971	4.852 0.011	4.727 0.010	4.085 0.013	-0.126	-0.642
04			10	4.852 0.019	4.735 0.018	4.094 0.013	-0.117	-0.641
09			6	4.855 0.025	4.735 0.026	4.065 0.048	-0.120	-0.671
15			1283	4.854 0.015	4.722 0.013	4.094 0.016	-0.132	-0.627
49			23	4.862 0.012	4.736 0.013	4.130 0.013	-0.125	-0.606
01	121 Tau	36819	248	5.382 0.013	5.303 0.012	4.676 0.015	-0.079	-0.627
04			4	5.380 0.012	5.311 0.016	4.677 0.009	-0.069	-0.634
20			12	5.388 0.004	5.303 0.004	4.688 0.008	-0.085	-0.614
73			17	5.379 0.010	5.301 0.017	4.676 0.029	-0.078	-0.625
20	HR 1860	36589	4	6.210 0.009	6.174 0.009	5.759 0.016	-0.036	-0.415

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