SIMBAD references

2014ApJ...791...58A - Astrophys. J., 791, 58 (2014/August-2)

Carbon and oxygen abundances across the Hertzsprung gap.

ADAMCZAK J. and LAMBERT D.L.

Abstract (from CDS):

We derived atmospheric parameters and spectroscopic abundances for C and O for a large sample of stars located in the Hertzsprung gap in the Hertzsprung-Russell diagram in order to detect chemical peculiarities and get a comprehensive overview of the population of stars in this evolutionary state. We have observed and analyzed high-resolution spectra (R = 60,000) of 188 stars in the mass range 2-5 M with the 2.7 m Harlan J. Smith Telescope at the McDonald Observatory including 28 stars previously identified as Am/Ap stars. We find that the C and O abundances of the majority of stars in the Hertzsprung gap are in accordance with abundances derived for local lower-mass dwarfs but detect expected peculiarities for the Am/Ap stars. The C and O abundances of stars with Teff< 6500 K are slightly lower than for the hotter objects but the C/O ratio is constant in the analyzed temperature domain. No indication of an alteration of the C and O abundances of the stars by mixing during the evolution across the Hertzsprung gap could be found before the homogenization of their atmospheres by the first dredge-up.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: atmospheres - stars: chemically peculiar - stars: evolution

VizieR on-line data: <Available at CDS (J/ApJ/791/58): table1.dat table2.dat table3.dat table4.dat table5.dat table6.dat table7.dat table9.dat>

Status at CDS:  

Simbad objects: 189

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2020.05.27-05:43:26

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