Abundance markers in H II regions of late spiral galaxies

Details Abundance markers in H II regions of late spiral galaxies Abundance markers in H II regions of late spiral galaxies

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt........20b&link_type=abstract

Ph.D. Thesis Laval Univ. (Quebec). Faculte des sciences et de genie.

Other

5

H Ii Regions, Spiral Galaxies, Stellar Composition, Stellar Spectrophotometry, Abundance, Hydrogen, Oxygen

Scientific paper

Large scale spectro photometric measurements were obtained for 130 and 160 H II regions from the spiral galaxies NGC628 (M74) and NGC6946 at the 1.6-m Mount Megantic Observatory telescope. The method of monochromatic imaging, carried out with the aid of narrow bandpass interference filters, has allowed integrating the flux in the spectral lines H-alpha, H-beta, O(III)(500.7 nm), and N(II)(658.4 nm). The O/H abundances and the abundance gradients were determined using the semi-empirical calibration of Edmunds and Pagel and O(III)/H-beta measurements in the H II regions observed. The high statistical reliability of the abundance gradients gives by extrapolation estimates of average abundance of 9.36 for NGC6946 and 9.20 for NGC628. The slopes of the two abundance gradients remain constant for all the radial domain covered in each galaxy. By comparing with the O/H abundance measurements of many other galaxies, it is shown that the gradient slopes, with a few exceptions, stay identical. The absence of correlation between the various gradients of the galaxies exists for all the physical parameters considered, in spite of the relatively wide domains of O/H abundance (8.4 and 9.4) and luminosity (9.5 to 10.5).

Affiliated with

Also associated with

No associations

Rating

Abundance markers in H II regions of late spiral galaxies 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 Abundance markers in H II regions of late spiral galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Abundance markers in H II regions of late spiral galaxies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1129614