Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

A SURVEY FOR SMALL-AMPLITUDE VARIABILITY AMONG POPULATION II STARS

R. S. McMILLAN, M. BREGER, G. J. FERLAND and G. L. LOUMOS
Publications of the Astronomical Society of the Pacific
Vol. 88, No. 524 (August 1976), pp. 495-509
Stable URL: http://www.jstor.org/stable/40675958
Page Count: 15
  • Read Online (Free)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A SURVEY FOR SMALL-AMPLITUDE VARIABILITY AMONG POPULATION II STARS
Preview not available

Abstract

A search for small-amplitude variability among members of old stellar populations reveals no variability > 0ṃ01 among 15 metal-deficient or high-velocity F- and G-type subdwarfs, 13 old-disk main-sequence F stars, four cluster blue stragglers, and seven blue horizontal-branch field stars. Variability was detected in two A-type stars: A metal-deficient main-sequence A star, BDS 1269A = HD 15165 is shown to have δ Scuti-like variability, and the variability of the high-velocity field blue straggler HD 100363 reported by Eggen (1971) is confirmed. The high-velocity sdAp star GD-210, a suspected variable, showed no amplitude > 0ṃ017 for three hours. Teff and log g of ten high-velocity, short-period variables are similar to those of the δ Scuti stars with Teff ≤ 7800° K, although the low-mass variables in the sample probably do not share the same evolutionary history as the higher-mass field blue stragglers.

Page Thumbnails

  • Thumbnail: Page 
495
    495
  • Thumbnail: Page 
496
    496
  • Thumbnail: Page 
497
    497
  • Thumbnail: Page 
498
    498
  • Thumbnail: Page 
499
    499
  • Thumbnail: Page 
500
    500
  • Thumbnail: Page 
501
    501
  • Thumbnail: Page 
502
    502
  • Thumbnail: Page 
503
    503
  • Thumbnail: Page 
504
    504
  • Thumbnail: Page 
505
    505
  • Thumbnail: Page 
506
    506
  • Thumbnail: Page 
507
    507
  • Thumbnail: Page 
508
    508
  • Thumbnail: Page 
509
    509