Other
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228..394k&link_type=abstract
Astrophysical Journal, Part 1, vol. 228, Mar. 1, 1979, p. 394-404.
Other
57
Astrometry, H Alpha Line, H Ii Regions, Nebulae, Astronomical Photography, Astronomical Photometry, Hydrogen Ions
Scientific paper
H-alpha photographic and photometric data have been obtained for 40 of the late-type galaxies measured by Sandage and Tammann (1974) in their calibration of the extragalactic distance scale. Microphotometric maps derived for the largest three H II regions in each galaxy are used to examine the physical reality and consistency of their subjective core and halo H II region diameters. While the structure of many nebulae is consistent with the visual data, a majority exhibit a more complex morphology which precludes the definition of meaningful metric diameters, visually or otherwise. Microphotometric metric diameters are found to be very susceptible to distance-dependent systematic errors, but carefully chosen and seeing-corrected isophotal diameters appear to offer a superior alternative as standard yardsticks.
No associations
LandOfFree
H II regions as extragalactic distance indicators. I - Observations and structural considerations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with H II regions as extragalactic distance indicators. I - Observations and structural considerations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and H II regions as extragalactic distance indicators. I - Observations and structural considerations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1649049