The spectral types of stars can be classified by using Balmer discontinuity(DB DB ) and wavelength(λB λB ) expressed in terms of effective temperatures appeared in Balmer discontinuity. In this research, in order to classify stars, we used the well established observational data of high dispersion spectrophotometry for the spectral types and luminosity classes of stars in the Breger(1976) catalogue. Balmer discontinuity by effective temperatures of stars was accurately measured, and the λB λB was replaced to luminosity classes of MK system, because of the close relationship between the As and luminosity classes. We measured the energy gradients(ϕR ϕR ) of stars which were expressed as a function of spectral types in the interval of λλ4,000∼4600\AA λλ4,000∼4600\AA , and then obtained a new physical parameter(ϕ ϕ ) from the DB DB and ϕB ϕB . The new parameter, ϕ ϕ can be used instead of HD classifications of stars and can be used widely for spectrophotometrical classifications of stars.

• 우종옥(한국교원대학교 지구과학 교육과) | U Jong-Ok