Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...267l..89b&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 267, April 15, 1983, p. L89-L92.
Astronomy and Astrophysics
Astronomy
20
Globular Clusters, Nitrogen, Stellar Evolution, Stellar Luminosity, Stellar Spectra, Ultraviolet Astronomy, Asymptotic Giant Branch Stars, Carbon, Iue, Mass To Light Ratios, Oxygen, Planetary Nebulae, Stellar Mass Ejection
Scientific paper
Ultraviolet images of the globular cluster M5 (NGC 5904) obtained with a rocket-borne telescope show a hot and luminous star ≡20arcsec from the cluster center. Spectra of this UV-bright star, obtained with the IUE satellite in the low-resolution mode, reveal an energy distribution very similar to that of μ Col, a Population I O9.5 IV star. Assuming an effective temperature of 35,000K for the UV-bright star, the authors find L = 1800 L_sun;, Mbol = -3.40, R = 1.15 R_sun;, and log g = 4.04. The N V λ1240 line is much stronger in the UV-bright star than in μ Col, indicating that the CNO cycle has converted the envelope C and O into N. A single emission line at the wavelength of the N IV intercombination line is also present, suggesting the possible existence of a planetary nebula.
Bohlin Ralph Charles
Cornett Robert H.
Hill Jesse K.
Smith Matthew A.
Stecher Theodore P.
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