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A Preliminary Speckle Orbit of the Old Disk Population Star HR 1071

Published online by Cambridge University Press:  12 April 2016

H.A. McAlister ,
W.I. Hartkopf  and
B.D. Mason
H.A. McAlister
Affiliation:
Center for High Angular Resolution Astronomy, Georgia State University, Atlanta, GA 30303, USA
W.I. Hartkopf
Affiliation:
Center for High Angular Resolution Astronomy, Georgia State University, Atlanta, GA 30303, USA
B.D. Mason
Affiliation:
Center for High Angular Resolution Astronomy, Georgia State University, Atlanta, GA 30303, USA

Extract

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The F7V star HR 1071 has attracted little individual attention in the literature. Eggen (1972, 1973) included HR 1071 among some 250 metal–deficient stars, of which 20 are halo population objects, in a photometric calibration of their absolute magnitudes. HR 1071 stands out in Eggen’s sample as a disk population star of extreme space velocity compared with stars of similar moderate metal deficiency, having (U, V, W) = (−60, −39, +8) km s−1. Kinematically, HR 1071 would be considered an old disk population star although this classification would be strengthened if the metallicity were lower. More recently, Balachandran (1990, hereafter BAL) took Eggen’s (1973) sample as a basis for studying the possible effects of rotational breaking on Li depletion in old–disk population F stars. HR 1071 possesses the fifth lowest Li abundance (the Li λ6707 Å equivalent width was less than 1 mÅ) and the third lowest observed rotational velocity of 5 km s−1 in BAL’s sample.

Type
High Resolution At Visual Wavelengths
Information
International Astronomical Union Colloquium , Volume 135: Complementary Approaches to Double and Multiple Star Research , 1992 , pp. 564 - 566
Copyright
Copyright © Astronomical Society of the Pacific 1992

References

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