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Luminosity and colour distribution in the interacting system NGC 7770-71

I. Surface photometry of NGC 7771

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Abstract

Detailed surface photometry for the SB(s)a galaxy NGC 7771 has been carried out in the blue spectral band. Isophotes, luminosity profiles, and photometric parameters are obtained from photographs collected with the 74 inch telescope of Kottamia Observatory, Egypt. The total apparent magnitudem T =13.08 with maximum dimensions 3′.6±0′.5×2′.7±0′.5 (at threshold µ m = 27.38 mag s−2). The absolute magnitude isM T =−21.70 if the distance is Δ=90.2 Mpc. The major axis is in position angle θ=69°.5±1° and the mean axis ratio of the outer regionsq=〈b/a〉=0.45 corresponds to an inclinationi=66°. The equivalent effective radiusr * e =0′.29 and the effective surface brightness µ e = 22.30 mag s−2.

The equivalent luminosity distribution has been decomposed into two main components, anr 1/4 spheroid and an exponential disk. The total apparent magnitudes of the spheroidal and disk components are 14.36 and 13.48, which correspond to contributions of 31 and 69% to the total blue luminosity, respectively.

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Author notes

  1. A. M. I. Osman

    Present address: Astronomy Department, Faculty of Science, King Abdulaziz University, P.O. Box 9028, Jeddah, Saudi Arabia

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  1. Helwan Observatory, Cairo, Egypt

    A. M. I. Osman

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  1. A. M. I. Osman
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Osman, A.M.I. Luminosity and colour distribution in the interacting system NGC 7770-71. Astrophys Space Sci 124, 345–357 (1986). https://doi.org/10.1007/BF00656046

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  • DOI: https://doi.org/10.1007/BF00656046

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