SIMBAD references

2001AJ....121..458Y - Astron. J., 121, 458-475 (2001/January-0)

Detection of metal-poor stars in the direction of the North Galactic Pole.


Abstract (from CDS):

A simple approach to detecting metal-poor stars is to measure a magnesium index, which depends on the Mg H band plus the three nearby Mg b lines and is derived through intermediate-band interference filters. An empirically established line of demarcation in the Mg index versus B-V diagram separates metal-poor stars from solar-abundance stars. A further separation between metal-poor dwarfs and giants depends on B-V; primarily dwarfs for B-V<0.55, giants for B-V>0.7, with both dwarfs and giants falling in the transition region. For the metal-poor giants the distance from the demarcation line correlates well with [Fe/H], permitting estimates of stellar abundances. Stars in two regions on the sky in the vicinity of the north Galactic pole have been observed with such a set of filters. Eighteen stars (6% of the population of 299) in the sample covering the V range 8.7 to 15.6 and 48 stars (31% of the population of 163) in a deeper probe to V=19.9 found through this process are suspected metal-poor stars according to their Mg indices. Twenty-three are specifically deemed giants, with <[Fe/H]>≤-1.5.

Abstract Copyright:

Journal keyword(s): Galaxy: Halo - Galaxy: Stellar Content - Stars: Population II

Nomenclature: Table 3: [YDM2001] NNN (Nos 1-291).

CDS comments: Table 2: Stars are 'Weis NNNNNN'.

Simbad objects: 407

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