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HD 181359


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A Photometric and Spectroscopic Study of 3 Vulpeculae: An Observer's Nightmare
We describe photometry of 3 Vulpeculae obtained with the Four CollegeAutomated Photoelectric Telescope and spectroscopy obtained with the1.22 m telescope of the Dominion Astrophysical Observatory. We haveanalyzed differential uvby photometric observations obtained over 7 yr.Three main frequencies (f1=0.9719, f2=0.7923, andf3=0.8553 cycles day-1) were found, as well as asum frequency (f1+f2=1.76420 cyclesday-1). A study of the photographic region usinghigh-dispersion spectrograms obtained with a Reticon detector at thecoudé spectrograph confirms the variable nature of 3 Vul as a 53Persei star and indicates that the star's abundances are normal formain-sequence band B stars. The new spectra were combined with thosepreviously published to confirm an orbital period very close to 1 yr.Finally, comparison with models yielded both a mass (4.16Msolar) and an age (25 Myr), and a mass range for thecompanion (0.6-1.1 Msolar). With an orbital period of almost1 yr and a pulsation period of almost 1 day, this star is indeed anobserver's nightmare.

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Observation and Astrometry data

Constellation:Lyra
Right ascension:19h19m10.73s
Declination:+26°55'55.2"
Apparent magnitude:7.368
Distance:253.165 parsecs
Proper motion RA:9
Proper motion Dec:-17.5
B-T magnitude:7.528
V-T magnitude:7.382

Catalogs and designations:
Proper Names
HD 1989HD 181359
TYCHO-2 2000TYC 2132-2013-1
USNO-A2.0USNO-A2 1125-12145687
HIPHIP 94942

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