Amplitude variability of Tau Pegasi and the nature of singly-periodic Delta Scuti stars

Details Amplitude variability of Tau Pegasi and the nature of singly-periodic Delta Scuti stars Amplitude variability of Tau Pegasi and the nature of singly-periodic Delta Scuti stars

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250..107b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 1, Oct. 1991, p. 107-112.

Astronomy and Astrophysics

Astrophysics

29

Light Curve, Stellar Oscillations, Variable Stars, Amplitude Distribution Analysis, Orbital Elements, Scutum Constellation, Stellar Spectrophotometry

Scientific paper

Previously unavailable photometric data from the McDonald Observatory are presented and analyzed. A frequency and amplitude analysis of these data, combined with other available measurements, are provided. The pulsation modes are determined, and the results are integrated into the general picture of Delta-Scuti stars. Tau-Peg = HR 8880 shows a dominant pulsation frequency of 18.4052 cycles/d with an amplitude changing slowly from 0.005 mag (or less) to 0.012 mag over 13 years. This is accompanied by smooth changes in phase, suggesting small period changes. The variations in amplitude and phasing are similar to those recently discovered in other nonradially pulsating delta-Scuti stars. The mode identification and the observed amplitude variability show that Tau-Peg is a typical nonradially pulsating Delta-Scuti star with fast rotation. This star shows that for small amplitudes the detection of only a single frequency is not an indication of radial pulsation. This is in contrast to the results found for large-amplitude Delta-Scuti stars which are radial pulsators.

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