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Physical Parmeters of Late Type Spiral Galaxies - II. Surface Brightness Distribution of NGC 7793
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저자
Kim, Chang-Ha
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저널명
The Korean Space Science Society
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발행년도
1986
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권호
V .3, N .1
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Isophotes and surface brightness distribution were obtained for the late type normal spiral galaxy NGC 7793 (morphological type SA(s)d) which is one of the Sculptor group. The calculated total luminosity $M_{T}$ is obtained as 9.44 and the corrected face on magnitude ${B_T}^{circ}$ is 9.10. The revised distance to this galaxy $\Delta$ =3.1 Mpc (de Vaucouleurs and Davoust 1980) is used for calculating the absolute magnitude ${M_T}^{circ}$ = -18.36. From the isophotes, the position angle to the major axis is $101^{circ}$ , the mean axial ratio is q=b/a =0.65, and the inclination is i=50$^{circ}$ . The concentric indices $C_{21}$ =1069 and $C_{32}$ =1.50 are well agreed to the average value of Sd type galaxies.