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Optical and near-infrared photometry of the Vega-excess star SAO 26804=HD 233517.
UBVRIJHK photometry of the Vega-excess star SAO 26804=HD 233517andseveral stars of its environments obtained at the 1-meter telescope ofthe Tien-Shan Observatory in Kazakhstan is presented. It is shown thatthe star has a later spectral type than has been considered previously.Its effective temperature is estimated by the visual surface brightnessmethod as 4170K. The star has no excess radiation in the range of0.3-2.5μm. A comparison of its IR-excesses with those of other K-typestars with IR-excesses is made. HD 233517 is probably more evolved thanSAO 179815=HD 98800 having a very similar intrinsic spectral energydistribution (SED) and the largest IR-excess among K-type stars from theSAO catalogue.
| UBV photometry of stars whose positions are accurately known. II
The present report on the UBV observations of stars with favorableastrometric history gives attention to stars of the BD zones lyingbetween 50 and 54 deg. These observations and their reductions wereperformed from August 1983 to August 1984, as described by Oja (1984).Results are presented as tables for both the standard stars and theprogram stars. Comparisons are conducted between the present Vmagnitudes and those of the NPZT (1982) and AGK3R (1978) catalogs.
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