Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26as...51..267m&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 51, Feb. 1983, p. 267-276. In French.
Astronomy and Astrophysics
Astrophysics
19
A Stars, Magnetic Stars, Peculiar Stars, Southern Sky, Stellar Spectrophotometry, Variable Stars, Binary Stars, Stellar Color
Scientific paper
From uvby measurements periods have been deduced for the Ap stars 25 Sex, HR 4327, β Hya, HD 112381, HR 4965, HR 5158, HR 5269, and HD 125630. The star HR 4109 (Sr?) remained constant during an interval of 23 d; the period is perhaps very long, or if HR 4109 actually does not vary, possibly it is not an Ap star. The observed variation for l Cen (Mn) was too weak to deduce a period. The variation range of HD 112381 (SiCr) is nearly as small as that of l Cen. The v and y variations for HD 125630 (SiCrSr), which are double-waved and nearly opposite to one another, have ranges among the largest known for Ap stars; the c1 range is also exceptionally large. For some Ap stars the variation curves show a dip of short duration in the four colours, and for a few stars a second one appears at a phase-interval of P/2. The nature of this phenomenon is discussed.
Manfroid Jean
Renson P.
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