Useful transformations between photometric systems

¹ Astronomical Institute of the Charles University, V Holešovičkách 2, 180 00 Praha 8, Czech Republic
² Astronomical Institute, Academy of Sciences, 251 65 Ondřejov, Czech Republic
³ Hvar Observatory, Faculty of Geodesy, Zagreb University, Kačićeva 26, 10000 Zagreb, Croatia e-mail: hbozic@geodet.geof.hr

Corresponding author: P. Harmanec, hec@sunstel.asu.cas.cz

Received: 15 August 2000
Accepted: 31 January 2001

Abstract

In the course of detailed studies of the long-term variations of particular Be stars, we have practically verified that the non-linear transformations, needed for a reliable transformation between a standard and an instrumental photometric system can also be successfully used to the transformations between two particular standard photometric systems. To demonstrate the importance and power of non-linear transformations and to provide pieces of information useful for a broader astronomical community, we summarize the transformation formulæalready published (but hidden from the general community in papers dealing with particular Be stars) and present several other useful transformations derived by us. All transformation formulæpresented here are transformations from various photometric systems to Johnson's UBV system. However, the general procedures applied here would allow construction of similar transformations between other photometric systems, too.