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HD 1424


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The period distribution of unevolved close binary systems
Period distributions have been examined for various spectral types ofabout 600 (eclipsing and spectroscopic) close binaries, which are likelyto be substantially unevolved. The comparison with the previouscorresponding analyses of extensive (but heterogeneous) binary samplesallows a clarification of the extent of the evolutionary andobservational selection effects. Remarkably, this analysis reveals agreat deficiency of short period binaries (with periods corresponding tocase A mass transfer) in the whole spectral range. For the late spectraltypes, this result may be connected with postformation angular momentumloss caused by stellar wind magnetic braking; at least for the late Band A spectral range, a ready interpretation of this finding is thatclose binaries of corresponding periods and spectral types are rarelyformed.

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Observation and Astrometry data

Constellation:Phoenix
Right ascension:00h18m09.99s
Declination:-52°58'04.8"
Apparent magnitude:9.294
Proper motion RA:10.7
Proper motion Dec:-189.8
B-T magnitude:10.092
V-T magnitude:9.36

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 1424
TYCHO-2 2000TYC 8465-246-1
USNO-A2.0USNO-A2 0300-00085877
HIPHIP 1457

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