The Helium and Nitrogen-Rich UV-Bright Star UIT-644 in Omega Cen

Details The Helium and Nitrogen-Rich UV-Bright Star UIT-644 in Omega Cen The Helium and Nitrogen-Rich UV-Bright Star UIT-644 in Omega Cen

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.0715l&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #07.15; Bulletin of the American Astronomical Society, Vol. 34, p.1103

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We report on STIS medium-resolution echelle (E230M) observations of the UV-Bright star UIT-644, located near the center of the globular cluster Omega Centauri. The observations cover the wavelength region 1625 -- 2364 Å with a resolution R=30,000. Earlier low-resolution optical spectra with the CTIO-4m have been used to derive the temperature (20,000 K), gravity (log g = 3.5) and bolometric luminosity (log L/LSun = 2.9), while revealing the star to be helium-rich (Y=0.68). The STIS spectra are used to show that the star is also extremely nitrogen-rich ([N/H] ~ 10), while having a typical cluster iron abundance ([Fe/H] = -1.5). The large nitrogen abundance probably requires that the products of helium burning be mixed to the surface, with the carbon subsequently converted to nitrogen. We speculate on a scenario in which UIT-644 ejected its envelope subsequent to a helium flash on the AGB.

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