Study of the variability of the Delta Scuti stars. VI Pulsational behaviour of HR 1392 (69 Tau).

Details Study of the variability of the Delta Scuti stars. VI Pulsational behaviour of HR 1392 (69 Tau). Study of the variability of the Delta Scuti stars. VI Pulsational behaviour of HR 1392 (69 Tau).

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26as...53..395b&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 53, Sept. 1983, p. 395-397, 399-402.

Astronomy and Astrophysics

Astrophysics

2

Electrophotometry, Hertzsprung-Russell Diagram, Light Curve, Stellar Spectrophotometry, Variable Stars, Angular Velocity, Data Reduction, Pulsed Radiation, Stellar Rotation

Scientific paper

Photoelectric observations of the Delta Scuti star 69 Tau are discussed. An analysis of the light curves reveals a single sinusoidal component over the detectability threshold. The observed frequency is not in agreement with the fundamental pulsation mode. It is thought probable that the small observed amplitude is connected with the high rotational velocity. However, the presence in the same region of the HR diagram of monopulsating Delta Scuti stars involving pulsational energies that differ by orders of magnitude remains a problem. The long-term stability of the Delta Scuti star 20 CVn is then confirmed on the basis of 17 hours of observation in 1982. The presence of a second pulsational mode is suspected, although this star has been thought to be a monopulsator. The small pulsation amplitude, like that of many other similar variable stars, is still in need of an explanation. It is considered possible that it is associated with the excitation of several high-order modes which would be photometrically undetectable and/or with a possible peculiar metallicity.

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