Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.1903n&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 105, no. 5, p. 1903-1914.
Astronomy and Astrophysics
Astronomy
27
Color-Magnitude Diagram, Hertzsprung-Russell Diagram, Northern Sky, Sky Surveys (Astronomy), Stellar Oscillations, Variable Stars, Astronomical Photometry, Color-Color Diagram, Cool Stars, Ubv Spectra
Scientific paper
A high-speed photometric survey of 120 Ap stars in the northern sky, has been conducted, between 1985 and 1991, in order to search for rapid variability. Stars of spectral types, namely from B8 to F4, have been selected for the survey. The selected pulsational variable stars occupy the hotter regions of the instability strip of the Hertzsprung-Russel diagram. Noted is the absence of pulsations in the hotter B8-A3 Ap stars; this does not, however, preclude the existence of pulsations, since HD 218495 was recently discovered to be a rapidly oscillating Ap (roAp) star. The primary result of this study is that various combinations of photometric indices, while pointing towards roAp stars having the characteristic signatures of cool, SrCrEu stars, still fail to isolate the roAp phenomenon from similar nonpulsating Ap stars. Color-magnitude and color-color diagrams are presented in order to complete this survey.
Kreidl Tobias J.
Nelson Matthew J.
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