Article (Scientific journals)
Evolution of the periodicity of the W UMa system Epsilon CrA
Manfroid, Jean; Heck, A.; Lunel, M. et al.
1987In Astronomy and Astrophysics, 176, p. 180-182
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Keywords :
ECLIPSING BINARY STARS; PERIODIC VARIATIONS; STELLAR SPECTROPHOTOMETRY; STELLAR MASS EJECTION; UBV SPECTRA; VARIABLE STARS
Abstract :
[en] Photometric uvby observations of Epsilon CrA obtained with the 1-m telescope at ESO during 1985 are compiled in tables along with published photometry from the period 1960-1984 and analyzed comprehensively. The results are presented in O-C diagrams and discussed, and a relative increase of 0.00001 in the period of the object is detected. It is pointed out that this change may have been gradual (over a 5-10-yr period) or abrupt (at about HJD 2,440,000), but that the period appears to have become stable again in the most recent observations.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Manfroid, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Heck, A.;  Observatoire Astronomique, Strasbourg, France
Lunel, M.;  Lyon, Observatoire, Saint-Genis-Laval, France
Bergeat, J.;  Lyon, Observatoire, Saint-Genis-Laval, France
Language :
English
Title :
Evolution of the periodicity of the W UMa system Epsilon CrA
Publication date :
01 April 1987
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
176
Pages :
180-182
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 11 February 2010

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