Comparison of spectra from stars of different metallicities

Sept. 1998

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B8III

HD079158 [Fe/H]=0.60 / HD078316 [Fe/H]=-0.02

-> 3700A - 4800A
-> 4500A - 5500A
-> 5700A - 6400A
-> 6000A - 6600A
-> 6500A - 7200A
-> 7200A - 7900A
-> 8400A - 9300A

F4V

HD087822 [Fe/H]=0.16 / HD101606 [Fe/H]=-0.82 / HD094028 [Fe/H]=-1.51

-> 4000A - 4800A
-> 4600A - 5800A
-> 5800A - 6400A
-> 6100A - 6850A
-> 8400A - 8950A

The following graph shows, from these 3 stars spectra, the dependance of lines equivalent widths with [Fe/H]:
They are the red CaII lines 8498A, 8542A and 8662A

In the next graph, a normalized equivalent width is plotted vs [Fe/H] for CaII lines H (x), K (+), 8498A (o), 8542A (*) and 8662A (filled o). Yellow points correspond to F4V stars and orange ones to F5V stars.



The stars contributing to this graph are:

star spectral type [Fe/H]
HD 87822 F4V +0.16
HD 134083 F5V +0.10
HD 99747 F5V -0.61
HD 101606 F4V -0.82
HD 97916 F5V -1.10
HD 94028 F4V -1.51
HD 108177 F5V -1.87
HD 84937 F5V -2.34

Same graph for G0V stars.



The stars contributing to this graph are:

star spectral type [Fe/H]
HD 115383 G0Vs +0.10
HD 141004 G0V -0.04
HD 157214 G0V -0.41
HD 63077 G0V -0.90
HD 21581 G0 -1.73
HD 39587 G0V -0.05
HD 110897 G0V -0.40
HD 63077 G0V -1.00
HD 6268 G0 -2.40

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