Abstract
UBV photometry of the central star of the Trid nebula - HD 164492, which has so far been sus- pected of photometric as well as of radial velocity vari- ability - is presented. The results of our photometry do not conrm any variability. Moreover, based on new high resolution CCD spectra any radial velocity variability can be discarded. Photometry of several other members of the multiple stellar system is included; according to this pho- tometry, the system is a physical one. Equivalent widths for the main component of HD 164492 are given. Positions measured on CCD exposures are presented too.
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