Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...245..136p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 245, no. 1, May 1991, p. 136-140.
Astronomy and Astrophysics
Astrophysics
5
Astronomical Photometry, Light Curve, Stellar Oscillations, Variable Stars, Astronomical Observatories, Least Squares Method, Power Spectra
Scientific paper
The results of 13 quasi-consecutive nights of observation of the Delta Scuti star HD101158 are presented. The observations are carried out on a 50-cm reflector and are subjected to 1234B measurements, a frequency analysis, and a Stromgen analysis. Three terms and their corresponding semiamplitudes are identified: f1 = 12.16222c/d, f2 = 10.83219c/d, and f3 = 9.27215c/d, corresponding to semiamplitudes of 0.0155 mag, 0.007 mag, and 0.006 mag, respectively. The ratios of these terms, considered in conjunction with the pulsational constants Qi, offer the possibility that the star is pulsating in both the first overtone and the fundamental radial mode with the excitation of a nonradial mode. Comparisons with earlier observations show that the star has been stable for a time interval of four years. The measurements show that the star is well inside the instability strip, and it is very close to the hot borderline of the fundamental radial mode.
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