Abstract
NGC 7217 is an ordinary spiral galaxy with three rings whose size ratios are such that they can be associated with resonances, as for barred spirals. From 21-cm HI line data and BVRI CCD-images of this galaxy we find (cf. Verdes-Montenegro et al. 1995): 1) a nuclear ring strong in Hα, 2) an inner ring seen clearly in a B -I colour map, and 3) an outer ring, with blue colours and strong HI-emission. After deprojection the disk has a mean ellipticity of 0.04 ± 0.01, while the position angle of the deprojected galaxy changes suddenly at 65″ radius, where the minor axis becomes major axis. Thus a very mild oval distortion could exist, with the outer ring perpendicular to the oval. Merrifield and Kuijken (1994) find from the stellar kinematics that about 20–30 % of the stars are in retrograde orbits.
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© 1996 Springer Science+Business Media Dordrecht
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Athanassoula, E., Bosma, A., Guivarch, B., Verdes-Montenegro, L. (1996). A Possible Evolutionary Scenario for NGC 7217. In: Bender, R., Davies, R.L. (eds) New Light on Galaxy Evolution. International Astronomical Union / Union Astronomique Internationale, vol 171. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0229-9_51
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DOI: https://doi.org/10.1007/978-94-009-0229-9_51
Publisher Name: Springer, Dordrecht
Print ISBN: 978-0-7923-3976-2
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