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For refcode 1996AJ....111.1880E:
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1996AJ....111.1880E NEAR-INFRARED OBSERVATIONS OF ISOPHOTAL TWISTS IN BARRED SPIRAL GALAXIES DEBRA MELOY ELMEGREEN Vassar College Observatory, Poughkeepsie, New York 12601 BRUCE G. ELMEGREEN IBM T. J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598 FREDERICK R. CHROMEY, DAVID ALAN HASSELBACHER, AND BRADLEY A. B1SSELL Vassar College Observatory, Poughkeepsie, New York 12601 Received 1995 December 5; revised 1996 February 7 ABSTRACT We present observations in JHK passbands for 12 barred galaxies and in BI passbands for 9 galaxies in order to study isophotal twists in early- and late-type barred spirals. We also summarize previous observations and examine high-resolution atlas images to compile data on twists as a function of Hubble type. Twists have been detected only in early-type spirals. This result is consistent with the hypothesis that only early- type bars have inner Lindblad resonances and that twists are associated with ILRs. The transition occurs around type SBbc and parallels the transition from bars with relatively flat intensity profiles to bars with exponential profiles in later types.
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