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HD 87032


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The Fourier decomposition as a mode discriminator - New first overtone pulsators among Cepheids with P less than 5.5 D
New very accurate light curves of 12 Cepheids with P less than 5.5 d arepresented. Their Fourier decomposition enabled us to individuate eightother stars which do not follow the Hertzsprung progression. Theproperties of the Fourier parameters of this subclass, now composed by28 objects, are consequently better defined. In the phi(21)-P plane 2stars located on the lower sequence and 2 other stars located on thediscontinuity at 3 d were found. All these 28 stars occupy the sameregion in the R(21)-P plane and the phi(31) values, when available,originate a unique sequence in the phi(31)-P plane. All these loci arewell separated from those of the classical Cepheids, which arefundamental mode pulsators. The hypotheses of a first overtone pulsationand of a resonance between this mode and a higher overtone explain theobservational facts well.

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Observation and Astrometry data

Constellation:Carina
Right ascension:09h59m49.47s
Declination:-66°01'29.0"
Apparent magnitude:8.026
Distance:320.513 parsecs
Proper motion RA:-23.3
Proper motion Dec:6.5
B-T magnitude:9.34
V-T magnitude:8.135

Catalogs and designations:
Proper Names
HD 1989HD 87032
TYCHO-2 2000TYC 8954-787-1
USNO-A2.0USNO-A2 0225-07214739
HIPHIP 49001

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