SIMBAD references

2002A&A...386..576E - Astronomy and Astrophysics, volume 386, 576-582 (2002/5-1)

The blue to red supergiant ratio in young clusters at various metallicities.


Abstract (from CDS):

We present new determinations of the blue to red supergiant ratio (B/R) in young open clusters at various metallicities. For this purpose, we examine the HR diagrams of 45 clusters in the Galaxy and of 4 clusters in the Magellanic Clouds. The identification of supergiants is based on spectroscopic measurements (with photometric counts to check the results). The new counts confirm the increase of the B/R ratio when the metallicity increases with the following normalized relation: (B/R)/((B/R))≃0.05.e3(Z)/(Z☉_)^, where Z=0.02 and (B/R) is the value of B/R at Z which depends on the definition of B and R and on the age interval considered (e.g. for spectroscopic counts including clusters with logage between 6.8 and 7.5, (B/R)≃3 when B includes O, B and A supergiants).

Abstract Copyright:

Journal keyword(s): stars: evolution - stars: supergiants - galaxies: Magellanic Clouds

Simbad objects: 56

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