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HD 145766


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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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Observation and Astrometry data

Constellation:Τρίγωνον Νότιον
Right ascension:16h16m38.82s
Declination:-64°09'52.1"
Apparent magnitude:8.044
Distance:285.714 parsecs
Proper motion RA:1.2
Proper motion Dec:-22
B-T magnitude:9.217
V-T magnitude:8.141

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 145766
TYCHO-2 2000TYC 9044-202-1
USNO-A2.0USNO-A2 0225-24983931
HIPHIP 79751

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