MODEL ATMOSPHERE AND KINEMATICAL ANALYSES OF EARLY-TYPE, HIGH GALACTIC LATITUDE STELLAR CANDIDATES FROM THE UKST UBVRI-SURVEY

被引：14

作者：

HAMBLY, NC ^{[1
]}

CONLON, ES ^{[1
]}

DUFTON, PL ^{[1
]}

KEENAN, FP ^{[1
]}

LITTLE, JE ^{[1
]}

MILLER, L ^{[1
]}

机构：

[1] ROYAL OBSERV,EDINBURGH EH9 3HJ,MIDLOTHIAN,SCOTLAND

来源：

ASTROPHYSICAL JOURNAL | 1993年 / 417卷 / 02期

关键词：

STARS; ABUNDANCES; ATMOSPHERES; EARLY-TYPE; EVOLUTION;

D O I：

10.1086/173349

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

From the UKST UBVRI survey, six high Galactic latitude stars have been previously identified which may be young hydrogen-burning objects. Using high-dispersion optical spectra, model atmosphere analyses are presented for these targets. Two, have normal or nearly normal Population I chemical compositions, one appears to be subluminous while the remaining three are possibly normal late B-type stars. A kinematic analysis indicates that one star having normal parameters is an excellent candidate for formation in the halo, having an evolutionary age an order of magnitude less than the time required for it to attain its current position following ejection from the Galactic disk. A preliminary analysis implies that there may currently be a few thousand normal B-type stars in the Galactic halo with z-distances from the plane of the Galaxy in the ran 3 < z < 22 k

引用

页码：706 / 712

页数：7

共 24 条

[11] LOW-DISPERSION SPECTROSCOPY OF BLUE STARS FROM THE UK SCHMIDT TELESCOPE UBVRI SURVEY [J].