Astronomy and Astrophysics – Astronomy
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246...38t&link_type=abstract
Astrophysical Journal, Part 1, vol. 246, May 15, 1981, p. 38-47.
Astronomy and Astrophysics
Astronomy
44
Abundance, Interstellar Gas, Star Formation, Stellar Spectrophotometry, Balmer Series, Electron Energy, Emission Spectra, H Ii Regions, Helium, Infrared Astronomy, K Stars, Line Spectra, Neon, Nitrogen, Nuclear Fusion, Oxygen, Red Shift, Spectrum Analysis, Sulfur, Supergiant Stars
Scientific paper
Photometry in J, H, and K bands reveals that there is an unresolved source of infrared emission associated with the brightest H II region in VII Zw 403, and the colors suggest the presence of a substantial number of K and M supergiants in addition to the hot O stars that must be present to account for the ionized gas. Spectrophotometry of this emission region indicates that reddening is substantial, and that the interpretation of the observed Balmer decrement in terms of reddening is not straightforward. The primary nucleosynthesis products O, S, and Ne are underabundant compared with the sun by a factor of 15; N is underabundant compared with the sun by a factor of 160; and the helium abundance suggests that either there could have been only a small number of star formation episodes or the galaxy is younger than the time scale of the process that deposits N in the interstellar medium.
Boesgaard Ann Merchant
Dyck Mel H.
Schempp William V.
Tully Brent R.
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