Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.202...59b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 202, Jan. 1983, p. 59-76.
Astronomy and Astrophysics
Astronomy
122
Carbon Stars, Magellanic Clouds, Milky Way Galaxy, Star Clusters, Stellar Evolution, Stellar Luminosity, Abundance, Astronomical Photometry, Asymptotic Giant Branch Stars, Hertzsprung-Russell Diagram, Red Giant Stars, Stellar Color, Stellar Envelopes, Stellar Magnitude, Stellar Mass, Stellar Spectra, Stellar Temperature
Scientific paper
Observations of relatively large numbers of stars in the SMC cluster NGC419 and the LMC cluster NGC1846, as well as of three stars in Kron 3 and two in NGC121 are presented with the aim of determining the effective temperature of the giant branch formed by oxygen-rich giants in stellar systems which contain carbon stars, and to determine the luminosity at which dredge-up of carbon first occurs in stellar systems of known age and abundance. The results of JHK photometry are presented, and the observed colors and magnitudes are listed. Absolute K magnitudes are plotted against intrinsic J-K color for all the measured stars, and individual H-R diagrams are plotted for all the clusters. It is estimated that carbon stars first appear on the asymptotic giant branch of the intermediate age Magellanic Cloud clusters at bolometric magnitude -4.3 to -4.6. It is deduced that dredge-up at helium shell flashes cannot produce carbon stars from stars with masses less than 0.9 solar masses if the abundance ratio Fe/H is about -1, or less than about 1.3 solar masses if the ratio is about zero.
Bessell Michael S.
Evans Tom Lloyd
Wood Peter R.
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