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Astron. Astrophys. 355, L35-L38 (2000) 2. Selection of the sample, observations and data reductionThe selection of the stars was based on their spectral type. As an initial choice, we have adopted values published in the literature. To have an independent check on the effective temperature of the selected stars, we have used the Strömgren photometry provided by the ESO catalogues of the LTPV project. Then, we have placed the stars in the dereddened color-color [m1]-[c1] diagram (see Strömgren 1966), and compared their position with the theoretical colors from model atmospheres (Kurucz 1992). As a result, we derived a sample of seven stars with spectral types between F5 and A5: V346 Ori, V351 Ori, BF Ori, BN Ori, NX Pup, HD 35929, and AK Sco. The photometric observations were performed in two runs with
different telescopes at ESO, La Silla. In the first period (Dec.
23-29, 1998), we used the 0.5k ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: March 21, 2000 ![]() |