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The Space, Luminosity And Velocity Distribution Of Faint Stars

Published online by Cambridge University Press:  03 August 2017

William F. van Altena ,
John T. Lee ,
Wean-Shun Tsay  and
Phillip K. Lu
William F. van Altena
Affiliation:
Yale University Observatory, New Haven, CT 06511
John T. Lee
Affiliation:
Yale University Observatory, New Haven, CT 06511
Wean-Shun Tsay
Affiliation:
Yale University Observatory, New Haven, CT 06511
Phillip K. Lu
Affiliation:
Department of Physics and Astronomy, Western Connecticut State University, Danbury, CT 06810

Extract

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The objective of this investigation is the determination of absolute parallaxes and proper motions with respect to faint galaxies for three fields at mid galactic latitudes and one field near the south galactic pole. The three mid galactic latitude fields were photographed on a IIIa-J + GG385 plate/filter combination by van Altena at the prime focus of the KPNO 4-meter in the mid 1970s, while the south polar region was photographed on a IIIa-F + RG610 plate/filter combination by van Altena and C.E. Lopez (Univ. of San Juan, Argentina) at the prime focus of the CTIO 4-meter; all plates were hypersensitized by baking and exposed to the sky limit. In this paper we report on the progress of an investigation of the mid galactic latitude field at R.A. = 7h 07m 31s and Dec. = +7o 19.7′ (1950) which contains the faint binary white dwarf LP543-32/33. Preliminary measurements of selected stars in this field were made some time ago and a parallax of the white dwarf binary were published by van Altena and Mora (1977). Those measurements showed that the plates were of very high astrometric quality and that it would be possible to obtain accurate parallaxes for very faint stars.

Type
Part II: Current Research
Information
Symposium - International Astronomical Union , Volume 133: Mapping the Sky: Past Heritage and Future Directions , 1988 , pp. 475 - 477
Copyright
Copyright © Kluwer 1988 

References

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