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J/AJ/107/1868        Cyclic period variability in SW Cyg     (Berrington+, 1994)

The cyclic period variability in SW Cygni BERRINGTON R.C., HALL D.S. <Astron. J. 107, 1868 (1994)> =1994AJ....107.1868B (SIMBAD/NED Reference)
ADC_Keywords: Binaries, eclipsing Abstract: Timings of primary eclipse up through 1992 are collected, plus a few overlooked in earlier studies. Analysis shows that, after decreasing until ∼1919 and increasing since then, the period has now started decreasing again, with the inflection point of the O-C curve being ∼1972. The shortest period was 4.5727 days, the longest 4.5732 days, with a full cycle length of 96 yr. Explanation by the time-delay effect, due to orbital motion around a third body, would require an unseen black hole companion of ≥10M. A magnetic cycle operating in the K-type subgiant, an active dynamo star because of its convection and rapid rotation, is the best explanation. Addresses: Berrington R.C. & Hall D.S. Dyer Observatory, Vanderbilt University, Nashville, Tennesee 37235 File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1 47 226 Times of primary minimum for SW Cygni
Byte-by-byte Description of file: table1
Bytes Format Units Label Explanations
1- 5 I5 --- Cycle Cycle number 7- 13 F7.4 d O-C O-C curve value 15- 21 F7.4 d O-C' O-C' curve value 23- 35 F13.4 d JD Julian date 38- 43 F6.4 d Error []? Uncertainty or error in original source 44 A1 --- n_Error Weights assigned by Slovochotova (1954) 46- 47 I2 --- Ref Reference (1)
Note (1): References: 1. Slovochotova 1954, P.Z., 10, 21 [pg,vp,ve] 2. Whitney 1959, AJ, 64, 258 [pg] 3. Szczepanowska 1956, AcA, 6, 144 [ve] 4. Lange 1959b, Astr. Circ. No. 201, 13 [ve] 5. Lange 1960, Astr. Circ. No. 209, 23 [ve] 6. Walter 1971, A&A, 13, 249 [pe] 7. Hall 1968, IBVS, No. 281 [pe] 8. Hall, Garrison 1972, PASP, 84, 552 [pe] 9. Frieboes-Conde, Herczeg 1973, A&AS, 12, 1 [pe] 10. Hall et al. 1979, AcA, 29, 653 [pe] 11. B.B.S.A.G. [ve] 12. Olson 1981, IBVS Mo. 1938 [pe] 13. Olson 1982, ApJ, 259, 702 [pe] 14. Flin 1983, M.V.S. 9, 89 [ve] 15. Kordylewski 1963, IBVS No. 35 [ve] 16. Scholz 1964, Harthaer Beobachtungs Zirkular No. 28 [pg] 17. B.A.A.V.S.S. [ve] 18. Struve 1946, ApJ, 104, 253 [sp] 19. Baldwin 1973, IBVS No. 795 [ve] 20. Parenago 1931, Russian AJ, 8, 229 [pg,vp] pg = photographic pe = photoelectric sp = spectroscopic ve = visual estimates vp = visual photometer
References: Slovochotova N.P., 1954, P.Z., 10, 21 Origin: AAS CD-ROM series, Volume 3, 1995
(End) Lee Brotzman [ADS] 16-Aug-1994, Patricia Bauer [CDS] 15-Feb-1995
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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