The Simbad FHB Stars

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In 1966 Oke, Greenstein and Gunn, from photoelectric spectral scans, suggested six stars as field horizontal branch stars. Later investigations by others removed HD 106223 and BD +17 4708 from the list leaving HD 2857, 86986, 109995 and 161817 among the brightest FHB stars known. Other sources of FHB stars were studies made at the NGP (Slettebak and Stock 1959), the SGP (Philip and Sanduleak 1968) and studies made in a number of high galactic latitude areas by Philip from Schmidt spectral plates obtained at Cerro Tololo. In all these areas A-type stars were identified and then measured photoelectrically in the Strömgren photometric system. FHB stars were indicated by their high c1 indices and low m1 indices. IUE spectra have been taken of many of these stars to confirm their FHB classification. In the Simbad database 71 stars are listed as FHB stars. However there are a number of these stars that have been misidentified. For example a star with a published magnitude of 13.2 is identified as a 6th magnitude star with an HD number. These identifications will be corrected in the poster paper. The stars range in V magnitude 6 to 14 and (b-y) color of 0.0 to 0.27. Recently new surveys, such as the Sloan Digital Sky Survey, 2MASS and the Hamburg ESO Sky Survey have identified many thousands of new FHB stars. The stars discussed here are important because they are so much brighter and high dispersion spectra can be obtained to make more detailed studies.

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