Astrometry and photometry for 156 ZNG UV-bright stars Virtual Observatory Resource

Authors
  1. Bond H.E.
  2. Published by
    CDS
Abstract

In 1972, Zinn, Newell, & Gibson (ZNG) published a list of 156 candidate UV-bright stars they had found in 27 Galactic globular clusters (GCs), based on photographs in the U and V bands. UV-bright stars lie above the horizontal branch (HB) and blueward of the asymptotic giant branch (AGB) and red giant branch in the clusters' color-magnitude diagrams. They are in rapid evolutionary phases-if they are members and not unrelated bright foreground stars. The ZNG list has inspired numerous follow-up studies, aimed at understanding late stages of stellar evolution. However, the ZNG candidates were presented only in finding charts, and celestial coordinates were not given. Using my own collection of CCD frames in u and V, I have identified all of the ZNG objects, and have assembled their coordinates, parallaxes, and proper motions from the recent Gaia Early Data Release 3 (EDR3). Based on the Gaia astrometry, I have determined which objects are probable cluster members (45% of the sample). For the members, using photometry from EDR3, I have assigned the stars to various evolutionary stages, including luminous post-AGB stars, and stars above the HB. I point out several ZNG stars of special interest that have still, to my knowledge, never been studied in detail. This study is an adjunct to a forthcoming survey of the Galactic GCs in the uBVI photometric system, designed for detection of low-gravity stars with large Balmer discontinuities.

Keywords
  1. globular-star-clusters
  2. giant-stars
  3. astrometry
  4. visible-astronomy
  5. trigonometric-parallax
  6. narrow-band-photometry
Bibliographic source Bibcode
2021AJ....161..204B
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/161/204
IVOA Identifier IVOID
ivo://CDS.VizieR/J/AJ/161/204
Document Object Identifer DOI
doi:10.26093/cds/vizier.51610204

Access

Web browser access HTML
https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/161/204
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/161/204
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/161/204
IVOA Table Access TAP
https://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/161/204/table1?
https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/161/204/table1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/161/204/table1?

History

2021-07-16T07:25:35Z
Resource record created
2021-07-16T07:25:35Z
Created
2022-09-30T21:45:41Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr