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Broadband UBVRCIC photometry of horizontal-branch and metal-poor candidates from the HK and Hamburg/ESO surveys. I.

Beers, Timothy C.; Flynn, Chris; Rossi, Silvia; Sommer-Larsen, Jesper; Wilhelm, Ronald; Marsteller, Brian; Lee, Young Sun; De Lee, Nathan; Krugler, Julie and Deliyannis, Constantine P., et al. (2007) In The Astrophysical Journal Supplement Series 168(1). p.128-139
Abstract
We report broadband UBV and/or BVRCIC CCD photometry for a total of 1857 stars in the thick-disk and halo populations of the Galaxy. The majority of our targets were selected as candidate field horizontal-branch or other A-type stars (FHB/ A, N = 576), or candidate low-metallicity stars (N = 1221), from the HK and Hamburg/ESO objective-prism surveys. Similar data for a small number of additional stars from other samples are also reported. These data are being used for several purposes. In the case of the FHB/ A candidates they are used to accurately separate the lower gravity FHB stars from various higher gravity A-type stars, a subsample that includes the so-called blue metal poor stars, halo and thick-disk blue stragglers, main-sequence... (More)
We report broadband UBV and/or BVRCIC CCD photometry for a total of 1857 stars in the thick-disk and halo populations of the Galaxy. The majority of our targets were selected as candidate field horizontal-branch or other A-type stars (FHB/ A, N = 576), or candidate low-metallicity stars (N = 1221), from the HK and Hamburg/ESO objective-prism surveys. Similar data for a small number of additional stars from other samples are also reported. These data are being used for several purposes. In the case of the FHB/ A candidates they are used to accurately separate the lower gravity FHB stars from various higher gravity A-type stars, a subsample that includes the so-called blue metal poor stars, halo and thick-disk blue stragglers, main-sequence A-type dwarfs, and Am and Ap stars. These data are also being used to derive photometric distance estimates to high-velocity hydrogen clouds in the Galaxy and for improved measurements of the mass of the Galaxy. Photometric data for the metal-poor candidates are being used to refine estimates of stellar metallicity for objects with available medium-resolution spectroscopy, to obtain distance estimates for kinematic analyses, and to establish initial estimates of effective temperature for analysis of high-resolution spectroscopy of the stars for which this information now exists. (Less)
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keywords
techniques : photometric, stars : Population II, stars : early-type, stars : horizontal-branch
in
The Astrophysical Journal Supplement Series
volume
168
issue
1
pages
128 - 139
publisher
University of Chicago Press
external identifiers
  • wos:000243387200005
  • scopus:33846810079
ISSN
0067-0049
DOI
10.1086/509324
language
English
LU publication?
yes
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2a804805-469b-4c1a-9ea1-59877d806c69 (old id 679586)
date added to LUP
2007-12-07 15:00:03
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2017-09-24 04:24:54
@article{2a804805-469b-4c1a-9ea1-59877d806c69,
  abstract     = {We report broadband UBV and/or BVRCIC CCD photometry for a total of 1857 stars in the thick-disk and halo populations of the Galaxy. The majority of our targets were selected as candidate field horizontal-branch or other A-type stars (FHB/ A, N = 576), or candidate low-metallicity stars (N = 1221), from the HK and Hamburg/ESO objective-prism surveys. Similar data for a small number of additional stars from other samples are also reported. These data are being used for several purposes. In the case of the FHB/ A candidates they are used to accurately separate the lower gravity FHB stars from various higher gravity A-type stars, a subsample that includes the so-called blue metal poor stars, halo and thick-disk blue stragglers, main-sequence A-type dwarfs, and Am and Ap stars. These data are also being used to derive photometric distance estimates to high-velocity hydrogen clouds in the Galaxy and for improved measurements of the mass of the Galaxy. Photometric data for the metal-poor candidates are being used to refine estimates of stellar metallicity for objects with available medium-resolution spectroscopy, to obtain distance estimates for kinematic analyses, and to establish initial estimates of effective temperature for analysis of high-resolution spectroscopy of the stars for which this information now exists.},
  author       = {Beers, Timothy C. and Flynn, Chris and Rossi, Silvia and Sommer-Larsen, Jesper and Wilhelm, Ronald and Marsteller, Brian and Lee, Young Sun and De Lee, Nathan and Krugler, Julie and Deliyannis, Constantine P. and Simmons, Andrew T. and Mills, Elisabeth and Zickgraf, Franz-Josef and Holmberg, Johan and Oenehag, Anna and Eriksson, Anders and Terndrup, Donald M. and Salim, Samir and Andersen, Johannes and Nordström, Birgitta and Christlieb, Norbert and Frebel, Anna and Rhee, Jaehyon},
  issn         = {0067-0049},
  keyword      = {techniques : photometric,stars : Population II,stars : early-type,stars : horizontal-branch},
  language     = {eng},
  number       = {1},
  pages        = {128--139},
  publisher    = {University of Chicago Press},
  series       = {The Astrophysical Journal Supplement Series},
  title        = {Broadband UBVRCIC photometry of horizontal-branch and metal-poor candidates from the HK and Hamburg/ESO surveys. I.},
  url          = {http://dx.doi.org/10.1086/509324},
  volume       = {168},
  year         = {2007},
}