Abundances in globular cluster red giants. II - M92 and M15
A detailed abundance analysis is performed for four stars in M92 and two stars in M15 by using LTE line-blanketed model atmospheres. The deduced result of [Fe/H] with respect to the Sun is —2.35 for M92 and —2.20 for Ml5. There are no obvious changes in the pattern of abundance as a function of atomic number except for a general lowering by a constant factor when M92 and M13 are compared. The dispersion in the Fe abundance of the M92 stars is very small. Implications for the mass and number of previous generations of stars and for mixing in the protoglobular cluster are discussed.
Additional Information© American Astronomical Society • Provided by the NASA Astrophysics Data System. Received 1978 December 4; accepted 1979 January 23. I am grateful to Dr. R. Kurucz for the use of his computer codes and to Mr. E. Carder, who carried out the PDS tracing of the echelle spectra. Mr. A. Phillips helped in averaging the from the spectra and did extensive keypunching. I thank Drs. E. Persson and P. Hintzen for their unpublished photometry.
Published - 1979ApJ___231__751C.pdf