Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jkas...29..255a&link_type=abstract
Journal of the Korean Astronomical Society, vol. 29, no. 2, p. 255-268
Astronomy and Astrophysics
Astronomy
Scientific paper
We present VR CCD photometry and long-slit spectroscopy of a late type spiral galaxy NGC 7678. The grey scale images and isophotal maps illustrate the presence of a weak bar from which spiral arms emerge. There are many HII regions along the spiral arms, but bright giant HII regions are more concentrated in the massive southern arm. The bright compact nucleus of NGC 7678 is bluer than bulge and bar. The spectral features of the nucleus and HII regions are very similar but the nuclear spectra shows higher [NII]lambda 6583/H_alpha than those of the HII regions. The nucleus of NGC7678 seems to be intermediate type between HII region nulcei and LINERs by the ratio of [NII]lambda 6583/H_alpha, but it is more likely to be HII region-like nucleus if we consider the [SNII]lambda 6716, 6731/H_alpha together. The star formation rate is estimated to be about 0.2 Mo/yr based on the H_alpha flux.
Ann Hong Bae
Kim Jeong-Mi
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