ORBi: Hensberge H. - The frequency of Ap-stars with long rotation periods

Reference : The frequency of Ap-stars with long rotation periods


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/22212

Title :	The frequency of Ap-stars with long rotation periods
Language :	English
Author, co-author :	Hensberge, H. [Brussel, Vrije Universiteit, Brussels, Belgium; Wien, Universitaet, Vienna, Austria]
	Manfroid, Jean [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
	Renson, Pierre [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Evol. et stabilité des étoiles et des amas d'étoiles (ESEA) >]
	Schneider, H. [Universitaetssternwarte, Goettingen, West Germany]
	Catalano, F. A. [Osservatorio Astrofisico, Catania, Italy]
	Weiss, W. W. [Wien, Universitaet, Vienna, Austria]
	Floquet, M. [Meudon, Observatoire, Meudon, Hauts-de-Seine, France]
	Maitzen, H. M. [> > > >]
Publication date :	1-Mar-1984
Journal title :	Astronomy and Astrophysics
Publisher :	EDP Sciences
Volume :	132
Pages :	291-295
Audience :	International
ISSN :	0004-6361
e-ISSN :	1432-0746
City :	Les Ulis
Country :	France
Keywords :	[en] A STARS ; ASTRONOMICAL PHOTOMETRY ; PECULIAR STARS ; STELLAR ROTATION ; VARIABLE STARS ; STELLAR SPECTRA ; VARIABILITY
Abstract :	[en] Light variability was observed over time intervals of months to years in the stars HD 55540, HD 71066, HD 94660, and HD 187474. The significance of these results is discussed in terms of the frequency of chemically peculiar CP2 stars showing (light) variability with periods longer than one month. This frequency, relative to the whole CP2 population, must lie somewhere between 4 and 16 percent. Observations, properly distributed in time, of a small subgroup of CP2 stars will be sufficient to obtain an accurate ratio of the number of LP-CP2 stars to the total number of CP2 stars. These observations, when continued until the periodicity is detected, could contribute also to the discussion whether these long periods should be identified with the rotation period.
Target :	Researchers ; Students
Permalink :	http://hdl.handle.net/2268/22212
Other URL :	http://cdsads.u-strasbg.fr/abs/1984A%26A...132..291H

File(s) associated to this reference

Fulltext file(s):

	File	Commentary	Version	Size	Access
Restricted access	1984A+A...132..291H.pdf		Publisher postprint	104.69 kB	Request copy

All documents in ORBi are protected by a user license.

Dspace v1.5