Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...416..787s&link_type=abstract
Astrophysical Journal v.416, p.787
Astronomy and Astrophysics
Astronomy
12
Stars: Abundances, Stars: Late-Type, Techniques: Spectroscopic
Scientific paper
A new spectrophotometric index, CRV, is assessed as a metallicity indicator for late-type stars. The index is the ratio of the measured photospheric fluxes in 20 Å wide passbands centered at 400t and 3901 Å. CRV correlates directly with the metallicity index, m1, of the Strömgren uvby system and with the metallicity index hk, of Anthony-Twarog et al. (1991).
Using observations of 236 dwarfs and 140 giants combined with stellar atmosphere models (Kurucz 1991), we compared the sensitivity of the CRV, m1, and hk indices to metal abundance. We also studied the sensitivity of the CRV, C1, and hk indices to surface gravity. The effect of interstellar extinction on all the indices was also studied from published mean extinction laws.
We find that the CRV index is sensitive to the variation of metal abundance, [M], over the range examined (-5.0 ≲ [M] ≲ 0.5). CRV is also more sensitive than the m1 index at metal-poor conditions ([M] ≲ -2.0). The CRV index has the following advantages: (1) the passbands of CRV are dominated by Fe lines, which reduce the uncertainty that may be introduced by the presence of lines of α-process elements with enhanced abundances at metal-poor conditions; (2) the effect of interstellar reddening is limited because the two passbands are separated in wavelength by only 100 Å. We also find that the atmospheric models produce results that agree qualitatively with the trends of observed indices on stellar parameters such as effective temperature, metallicity, and surface gravity.
Baliunas Sallie L.
Kurucz Robert L.
Soon Willie W.-H.
Zhang Qian
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