TY - JOUR
T1 - A spectroscopic survey of FHB stars near the south galactic pole
AU - Rossi, Silvia
AU - Ortiz, Roberto
AU - Wilhelm, Ronald
AU - Costa, Roberto
AU - Beers, Timothy C.
PY - 2009/8
Y1 - 2009/8
N2 - We present the results of a medium-resolution spectroscopic survey of 43 field horizontal-branch (FHB) candidates carried out near the south galactic pole, selected from the original list of FHB candidates compiled by Beers et al. (2007). The observation list includes only stars classified as "high-probability" candidates, according to their 2MASS infrared colours. Atmospheric parameters of some stars have been obtained by comparing some spectral features with theoretical models provided by Kurucz (1993). A comparison between the grid of model atmospheres with some parameters of the Hδ line allowed the determination of log g, whilst [Fe/H] was estimated by the equivalent widths of the MgΠ 4481 and CaΠ lines. About 77% of the sample have been classified as FHB stars, 10% as subdwarfs, whilst the remaining 13% are probably main-sequence A-type stars far from the Galactic plane.
AB - We present the results of a medium-resolution spectroscopic survey of 43 field horizontal-branch (FHB) candidates carried out near the south galactic pole, selected from the original list of FHB candidates compiled by Beers et al. (2007). The observation list includes only stars classified as "high-probability" candidates, according to their 2MASS infrared colours. Atmospheric parameters of some stars have been obtained by comparing some spectral features with theoretical models provided by Kurucz (1993). A comparison between the grid of model atmospheres with some parameters of the Hδ line allowed the determination of log g, whilst [Fe/H] was estimated by the equivalent widths of the MgΠ 4481 and CaΠ lines. About 77% of the sample have been classified as FHB stars, 10% as subdwarfs, whilst the remaining 13% are probably main-sequence A-type stars far from the Galactic plane.
KW - Galaxy: halo
KW - Galaxy: stellar content
KW - Stars: horizontal-branch
UR - http://www.scopus.com/inward/record.url?scp=84884960093&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84884960093&partnerID=8YFLogxK
U2 - 10.1017/S1743921310003522
DO - 10.1017/S1743921310003522
M3 - Article
AN - SCOPUS:84884960093
SN - 1743-9213
VL - 5
SP - 422
EP - 423
JO - Proceedings of the International Astronomical Union
JF - Proceedings of the International Astronomical Union
IS - S262
ER -