Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13q.578a&link_type=abstract
In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J
Astronomy and Astrophysics
Astronomy
Stellar Abundances, Lyman-Alpha Systems
Scientific paper
Whilst it is known that oxygen is produced in massive stars and is dispersed into the ISM by type II supernovae the origins and yields of carbon are less certain. Carbon is produced during helium burning in both massive intermediate-mass and low-mass stars but the dependence of the carbon yield on stellar mass and initial composition is not well known. A reliable determination of the C/O abundance ratio as a function of the oxygen abundance for main-sequence stars will be helpful in gaining an understanding of these problems.
Previous studies have measured the C/O ratio for disk stars using forbidden lines ([CI] 8727.1 A [OI] 6300.3 A). In halo main-sequence stars with [Fe/H] < -1 the forbidden carbon line is too weak to be measured. Tomkin et al. (1992) use instead four high excitation CI lines around 9100A together with the oxygen triplet at 7774 A. To test and expand on their results which hint at interesting features in the trend of [C/O] we derive C and O abundances for 35 metal-poor halo stars from high resolution near-IR VLT/UVES spectra. Combined with the previous [C/O] measurements a more detailed trend with oxygen abundance is derived.
Akerman Chris J.
Asplund Martin
Carigi Leticia
Nissen Poul Erik
Pettini Marco
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