NGC 7716 (Fig. 5t).-Thirty H II regions form a complete ring in this barred
galaxy. No gradients or correlations to the bar are observed.
NGC 7716: Laine et al. (2002). Outer-bar measurements are from the
publically available K-band image of Mulchaey et al. (1997); inner-bar
measurements are from a NICMOS2 F160W image.
NGC 7716 (CS)
Because the nucleus is close to the edge of the H image, it is
difficult to get a detailed picture of the circumnuclear dust
morphology. There is a weak spiral arm that extends to the north,
although to the south there are only a few scattered dust clumps.
Bar is visible in both the ellipse fits and the K_S_image. Unbarred in the
July 22/23, 1976
103aO + GG13
Like NGC 2196, NGC 7716 has features of both the grand design and
the MAS spiral types.
The central part of the image consists of a
high-surface-brightness bulge whose major axis position angle is
tipped by 15 deg to the position angle of the smooth inner disk,
inside of which no spiral structure exists. Both of these features
(the bulge and the smooth inner disk) are nearly burned out on the
The spiral pattern begins at the rim of the smooth inner
disk. Knots, presumably HII regions, reside primarily on the rim of
the disk. The system of two principal thin, tightly wound arms begins
on this rim, As the arms wind outward they fragment into several
branches. Many knots (H II regions?) exist in the outer arms,
indicating an appreciable recent star-formation rate.
SAB(r)b: (de Vaucouleurs)
Very bright nucleus. Very faint bar. Bright (r): 0.45 arcmin x 0.3 arcmin.
Several faint, narrow, filamentary arms with some branches.
One aberrant value of (B-V) (source C) was rejected