Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..363m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 2, p. 363-368
Astronomy and Astrophysics
Astrophysics
16
H Alpha Line, H Ii Regions, Size Determination, Spiral Galaxies, Stellar Luminosity, Velocity Distribution, Fabry-Perot Interferometers, Radial Velocity, Radio Observation, Red Shift, Spatial Resolution, Spectral Resolution, Telescopes
Scientific paper
The galaxy NGC 7331 has been observed with an IPCS through an H alpha filter for direct imagery and through a scanning Fabry-Perot interferometer at H aplha wavelength with the 2.60 m Byurakan telescope to study the main physical parameters of 47 H II regions, diameter and luminosity, as well as their velocities. The cumulative diameter distribution of H II regions is well represented by an exponential function with the parameters N0 = 272 and D0 = 95 pc. The H alpha luminosity function is described by a power law with index - 1.6. The H alpha velocity field of the galaxy is in good agreement with radio observations. Much less extended but offering a higher spatial resolution, it reveals non-circular motions, like the classical wiggles of the isovelocity lines when crossing a spiral arm, or the Z shape distortions of the isovelocity lines in the center possibly revealing an unseen bar.
Amram Ph.
Boulesteix Jacques
Marcelin Michel
Petrosian Artashes R.
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