Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....90l..17m&link_type=abstract
Astronomy and Astrophysics, vol. 90, no. 1-2, Oct. 1980, p.L17-L20.
Astronomy and Astrophysics
Astrophysics
94
Chemical Composition, Galactic Structure, Red Giant Stars, Supergiant Stars, Hot Stars, Magellanic Clouds, Stellar Evolution, Stellar Mass Ejection
Scientific paper
It is shown that the ratio NR/NWR of the numbers of red supergiants to the number of WR stars varies very strongly with galactocentric distance, by a factor of about 90 between zones located at 7-9 kpc and 11-13 kpc from the galactic center. However, the ratio of the sum of the numbers of red supergiants and WR stars to that of blue supergiants, (NR+NWR)/NB, remains almost constant with galactocentric distance. A relation, also satisfied by the LMC and SMC, is obtained between the NR/NWR ratio and the metal content Z.
We suggest that the strong gradients in NR/NWR result from the effects of the abundance of heavy ts on the rate of mass loss, which in turn strongly influences the relative duration of the red supergiant and WR phases.
Azzopardi Marc
Lequeux James
Maeder Andre
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