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A search for rapidly oscillating Ap stars in the northern hemisphere

Published online by Cambridge University Press:  03 August 2017

Tobias J. Kreidl
Tobias J. Kreidl*
Affiliation:
Lowell Observatory, Mars Hill Rd., 1400 West Flagstaff, AZ 86001, U.S.A.

Abstract

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Since 1984, efforts have been underway at Lowell Observatory to monitor Ap stars for rapid oscillations utilizing a photoelectric photometer on 0.6- to 1.8-meter telescopes. These variables, first discovered and designated as a subgroup of Ap stars by D.W. Kurtz, pulsate with periods between 4 and 15 minutes and light variations less than about 0.m016 in B. This strongly suggests high overtone p-mode oscillations as the cause of rapid variability. To attempt to increase the known number, Ap stars of spectral type B9 and later are being monitored. As members currently span the range A5 to F0, it is important to establish within what limits rapid oscillations are present. So far, only one new member has been found at Lowell (HD 134214), bringing the known total to eleven. The coordination of observations for known members has proved to be useful; no fewer than five rapidly oscillating Ap stars have been observed via multi-site, coordinated photometry. In this context, the status of this observing program and its future goals are presented.

Type
Chapter 4: Asteroseismology: Results and Prospects
Information
Symposium - International Astronomical Union , Volume 123: Advances In Hello- and Asteroseismology , 1988 , pp. 269 - 272
Copyright
Copyright © Reidel 1988 

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