IUE observations of UV bright stars in the globular clusters M15 and Omega CEN

Details IUE observations of UV bright stars in the globular clusters M15 and Omega CEN IUE observations of UV bright stars in the globular clusters M15 and Omega CEN

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...139..285c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 139, no. 2, Oct. 1984, p. 285-288.

Astronomy and Astrophysics

Astronomy

22

Globular Clusters, Stellar Spectra, Ultraviolet Astronomy, Far Ultraviolet Radiation, Iue, Stellar Temperature

Scientific paper

IUE spectra in the low dispersion mode are reported for three UV-bright stars. Two of them (stars K 559 and K 996) are members of the very metal poor cluster M15 and one (star ROA 5701) is a member of the populous cluster ω Cen. The authors find E(B-V) = 0.11 as a lower limit for the reddening of ω Cen whereas the reddening of M15 should not be larger than E(B-V) ≅ 0.08. Effective temperatures and bolometric magnitudes are evaluated for all the stars. Comparison with previous estimates shows that such temperatures tend to be generally lower than previously expected on a (B-V) basis. This difference is of the order of 2000K for ROA 5701, but it reaches more than 7000K for the two other stars. Evolutionary implications are discussed briefly.

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