Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97...97z&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, Jan. 1989, p. 97-106.
Astronomy and Astrophysics
Astronomy
68
Astronomical Spectroscopy, Galactic Structure, H Ii Regions, Mass To Light Ratios, Spiral Galaxies, Forbidden Transitions, Gratings (Spectra), H Beta Line, Metallicity, Oxygen Spectra
Scientific paper
Moderate-dispersion, 0l.7 A/pixel spectra of H II regions in M33 were taken, and the velocity as well as the excitation were measured by observing the spectral region around H-beta. Velocity measurements for 55 H II regions and excitation measurements for 42 regions are presented. The velocity data are used to measure the systemic velocity at -172 + or - 6 km/s, the inclination at 56 + or - 1 deg, the position angle of the major axis at 23 + or - 1 deg, the rotation curve of the H II regions, and their line-of-sight velocity dispersion at 9 + or - 4 km/s. These data are used to derive the M/L ratio from radii of 0.5-3.7 kpc. The excitation measurements are used to derive a metallicity gradient for M33 and to quantify the dispersion in the excitation values at a given radius.
Elston Richard
Hill James M.
Zaritsky Dennis
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