Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...289..162b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 289, no. 1, p. 162-168
Astronomy and Astrophysics
Astrophysics
12
Main Sequence Stars, Power Spectra, Stellar Magnitude, Stellar Oscillations, Variable Stars, Electrophotometers, Frequency Distribution, Light Curve, Modes, Pulse Amplitude, Stellar Spectrophotometry
Scientific paper
Multisite photoelectric B and V photometry of the delta Scuti star 63 Her was obtained on three continents. Three frequencies of pulsation (f1 = 11.32, f2 = 20.07 and f3 = 7.72 c/d) were detected with a signal/noise amplitude ratio greater than or = 4.0. The three frequencies fit all the available data ranging back to 1968. Reports in the literature of discepant behavior of the 1968 measurements were probably caused by overinterpretation. The new frequency values are in excellant agreement with the results found by Reed & Welch from their 1983 data, except for a 1 c/d alias in their value for f2. Two additional pulsation frequencies in the low-frequency g-mode domain with amplitudes near two millimag reported by the STEPHI group are not seen in the new campaign data. The new data show average noise levels just below one millimag in this frequency domain, so that the existence of these two frequencies cannot be disproved from the new data alone. However, a reanalysis of the STEPHI data also suggests that these frequencies might not be real. The results from the two multisite campaigns should be free of 1 c/d aliasing, so that a resonance hypothesis involving f2 = f1 + f3 can be rejected. The value of the pulsation constant associated with f3, Q = 0.046 +/- 0.008 d, is too high by 2 standard deviations to be explained by radial pulsation. The Q value is incompatible with those of nonradial p1 to p4 modes commonly found in delta Scuti stars.
Akan Can M.
Breger Michel
Evren Serdar
Ibanoglu Cafer
Jiang Shi-Yang
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