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Cepheid studies. III - Energy changes in the beat Cepheid U Trianguli Australis
Four hundred and eighty-one UBVRI observations of the beat Cepheid U TrAobtained in the 1977 season are reported. The V luminosities have beenFourier analyzed to provide both improved estimates for the periods, andamplitude and phase values for the double-mode Fourier terms. Acomparison with extensive observations made 18 years ago indicates thatthere has been a redistribution of pulsation energy in favor of thefirst overtone at the expense of the fundamental. It is postulated thatthis is not due to mode-switching, but rather to the intermode couplingthat exists between the two pulsations.
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Osservazione e dati astrometrici
| Costellazione: | Triangolo Australe |
| Ascensione retta: | 16h16m38.82s |
| Declinazione: | -64°09'52.1" |
| Magnitudine apparente: | 8.044 |
| Distanza: | 285.714 parsec |
| Moto proprio RA: | 1.2 |
| Moto proprio Dec: | -22 |
| B-T magnitude: | 9.217 |
| V-T magnitude: | 8.141 |
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