Article (Scientific journals)
π Aquarii is another γ Cassiopeiae object
Nazé, Yaël; Rauw, Grégor; Cazorla, Constantin
2017In Astronomy and Astrophysics, 602
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Keywords :
stars: early-type; stars: emission-line; Be; X-rays: stars; stars: individual:πAqr
Abstract :
[en] The γ Cas category is a subgroup of Be stars displaying a strong, hard, and variable thermal X-ray emission. An XMM-Newton observation of π Aqr reveals spectral and temporal characteristics that clearly make this Be star another member of the γ Cas category. Furthermore, π Aqr is a binary but, contrary to γ Cas, the nature of the companion to the Be star is known; it is a non-degenerate (stellar) object and its small separation from the Be star does not leave much room for a putative compact object close to the Be disk. This renders the accretion scenario difficult to apply in this system, and, hence, this discovery favors a disk-related origin for the γ Cas phenomenon. Based on observations collected with the ESA science mission XMM-Newton, an ESA Science Mission with instruments and contributions directly funded by ESA Member States and the USA (NASA).
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Nazé, Yaël  ;  Université de Liège > Groupe d'astrophysique des hautes énergies (GAPHE)
Rauw, Grégor  ;  Université de Liège > Groupe d'astrophysique des hautes énergies (GAPHE)
Cazorla, Constantin ;  Université de Liège > Groupe d'astrophysique des hautes énergies (GAPHE)
Language :
English
Title :
π Aquarii is another γ Cassiopeiae object
Publication date :
01 May 2017
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
602
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 16 June 2017

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