G. Zhao et al 2001 ApJ 551 L85 doi:10.1086/319832
High-Resolution Spectroscopic Observations of Hipparcos Red Clump Giants: Metallicity and Mass Determinations
FREEG. Zhao1,2, H. M. Qiu1,2 and Shude Mao3
Show affiliationsWe obtain high-resolution and high signal-to-noise ratio spectra of 39 red clump giants selected from the Hipparcos Catalogue. We determine their atmospheric parameters, iron abundances, α-element enhancements, and masses. We find that the sample can be divided into a metal-poor group and a metal-rich group. The majority of the stars are metal-rich (Z > 0.3 Z
) with mass around 2 M, while the metal-poor group has lower surface gravity and lower mass. The variation of α-element abundances with [Fe/H] agrees with that of local G and K disk dwarfs. We also show that the metallicity is weakly correlated with the I-band absolute magnitude and the V-I color, in agreement with Udalski's recent findings. We make the high-resolution spectra available over the internet for interested readers.
- Subject headings
- Dates
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Issue 1 (2001 April 10)
Received 2000 November 2, accepted for publication 2001 March 2
Published 2001 March 29
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High-Resolution Spectroscopic Observations of Hipparcos Red Clump Giants: Metallicity and Mass Determinations
G. Zhao et al 2001 ApJ 551 L85
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