Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...239...69s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 239, no. 1-2, Nov. 1990, p. 69-77.
Astronomy and Astrophysics
Astrophysics
Astronomical Photometry, Astronomical Spectroscopy, Elliptical Galaxies, Galactic Bulge, Charge Coupled Devices, Galactic Evolution, H Ii Regions, Ionized Gases, Star Formation
Scientific paper
The properties of the galaxy UGC 11,000 were investigated using broad-band and narrow-band CCD images, K-band photometry, long-slit optical spectroscopy, and 21-cm radio observations. Results show that the UGC 11,000 can be classified as belonging to the SB(s)dm IV galaxy type. Its heliocentric velocity was found to be equal to (1398 + or - 15) km/sec, which is about a factor of 4 larger than that assumed previously. Three dominant stellar populations were distinguished in UGC 11,000: (1) a bulge with colors corresponding to early-F main sequence stars; (2) a young disk populaton with median colors of late-A type, associated with the spiral-arm pattern and numerous giant H II regions; and (3) an older population of G to K stars corresponding to the outermost regions of the galaxy. The giant H II regions exhibit high star-forming activity and high oxygen abundance. The bulge and the outer disk are free of ionized gas and contain red stars.
Hopp Ulrich
Schulte-Ladbeck Regina E.
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