A search for rapidly oscillating AP stars. I - The Ap-rich open cluster NGC 2516. II - Evidence for oscillations in the field star HD 116763

Details A search for rapidly oscillating AP stars. I - The Ap-rich open cluster NGC 2516. II - Evidence for oscillations in the field star HD 116763 A search for rapidly oscillating AP stars. I - The Ap-rich open cluster NGC 2516. II - Evidence for oscillations in the field star HD 116763

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pasp..100..255m&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 100, Feb. 1988, p. 255-261. NSERC-supported research.

Astronomy and Astrophysics

Astronomy

6

A Stars, Open Clusters, Peculiar Stars, Southern Sky, Stellar Oscillations, Electrophotometry, Fourier Analysis, Light Curve, Star Clusters

Scientific paper

Four stars in the southern open cluster NGC 2516, suspected by Antonello and Mantegazza (1986) of being peculiar A stars and also lying at the red edge of the lower instability strip, were monitored photoelectrically for rapid variability in broad-band light during February/March 1987. No oscillations were detected, with upper limits of roughly 0.001 magnitude in amplitude; however, in light of the amplitude modulation which is observed in the known rapidly oscillating Ap (roAp) stars, these stars cannot yet be rejected as candidates. We also obtained rapid photometry of the field Ap star HD 116763. Frequency analysis of nine hours of data taken on four nights indicates the presence of coherent oscillations with periods of about 7.1 and 19.8 minutes. We urge further rapid photometry of this star by observers in the Southern Hemisphere to establish whether HD 116763 is in fact the 13th member of the class of roAp stars to be detected.

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