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Astron. Astrophys. 351, 860-868 (1999)


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BVRI-H[FORMULA] surface photometry of peculiar ring galaxies *

I. HRG 2302

M.L.M. Myrrha 1, L.P.R. Vaz 1, M. Faúndez-Abans 2, M. de Oliveira-Abans 2 and D.S.L. Soares 1

1 Departamento de Física, ICEX-UFMG, C.P. 702, 30.123-970 Belo Horizonte, MG, Brazil
2 CNPq/Laboratório Nacional de Astrofísica, C.P. 21, 37.500-000, Itajubá, MG, Brazil (leticia@fisica.ufmg.br, lpv@fisica.ufmg.br, mfaundez@lna.br, mabans@lna.br, dsoares@fisica.ufmg.br)

Received 11 February 1999 / Accepted 22 September 1999

Abstract

Detailed BVRI-H[FORMULA] photometry has been obtained for the ring galaxy HRG 2302. This is probably a still interacting system which shows two principal components: the target, which is a knotted ringed-disk, and the intruder, an elongated galaxy with two substructures probably caused by the interaction. The existence of HII emission regions is suggested by H[FORMULA] images and medium dispersion spectra of the three brightest parts of this system. Analysis of a color-color diagram suggests recent star formation, in agreement with the behavior of interacting galaxies with nuclear emission. HRG 2302 has been previously classified as a Polar Ring galaxy (Faúndez-Abans & de Oliveira-Abans 1998a), but we have reclassified it as Elliptical-Knotted, based on the morphological substructures found. This work reveals, for the first time, the existence of at least 15 fainter galaxies in the field within [FORMULA] around HRG 2302, giving positions and integrated standard magnitudes for all of them.

Key words: galaxies: formation – galaxies: individual: HRG 2302 – galaxies: interactions – galaxies: peculiar – galaxies: structure

* Based on observations made at the Observatório do Pico dos Dias (OPD), operated by the MCT/CNPq/Laboratório Nacional de Astrofísica, in the state of Minas Gerais, Brazil

Send offprint requests to: M.L.M. Myrrha

© European Southern Observatory (ESO) 1999

Online publication: November 16, 1999

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