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HD 138979


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Extremely metal-deficient red giants. I - A new objective-prism, photometric, and radial-velocity survey
Results of an extensive objective-prism survey to detect extremelymetal-deficient red giants and a subsequent investigation of thephotometric and radial velocity properties of the newly discovered starsare presented. The 132 red giants with Fe/H abundance ratios less thanor equal to -1.5 discovered in the present objective-prism survey on a10-deg prism down to B magnitudes of 11.5, and by previousobjective-prism and other surveys, are listed, together with results ofradial velocity and photometric measurements. Examination of theStromgren m1 index calibrated against high-resolution spectroscopicdeterminations of the Fe-H abundance ratio indicates that population IIIfield giants with abundance ratios less than -3 are extremely rare. TheStromgren c1 index is used as an indicator of surface gravity andanomalous CH strengths, resulting in the identification of field redhorizontal-branch stars, field asymptotic-branch giants and subgiants.Radial velocities obtained for about half the stars reveal thatessentially all of them have halo motions, and that the incidence ofspectroscopic binaries is very low.

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Osservazione e dati astrometrici

Costellazione:Triangolo Australe
Ascensione retta:15h38m44.23s
Declinazione:-61°49'38.8"
Magnitudine apparente:8.562
Distanza:10000000 parsec
Moto proprio RA:-13.5
Moto proprio Dec:-16.6
B-T magnitude:10.447
V-T magnitude:8.718

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 138979
TYCHO-2 2000TYC 9022-341-1
USNO-A2.0USNO-A2 0225-23397404
HIPHIP 76613

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