HD 45314: A new γ Cassiopeiae analog among Oe stars

G. Rauw, Y. Nazé, M. Spano, T. Morel, A. Ud-Doula

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15 Scopus citations

Abstract

Context. Oe stars possibly form an extension to higher temperatures of the Be phenomenon, but it is still unclear whether these stars have disks. Aims. X-ray spectra could provide hints for interactions of the star with a putative surrounding disk. Methods. We obtained XMM-Newton observations of two Oe stars, HD 45314 and HD 60848. Spectra and light curves were extracted and analysed. Optical spectra were also obtained to support the X-ray observations. Results. We find that both stars display very different X-ray properties. Whilst HD 60848 has an X-ray spectrum and emission level typical for its spectral type, HD 45314 displays a very hard X-ray emission, dominated by a thermal plasma with kT ∼ 21 keV. Furthermore, HD 45314 displays count rate variations by a factor 2 on timescales of ∼ 103 s and a high log (LX/L bol) =-6.10 ± 0.03. Conclusions. The X-ray properties of HD 45314 indicate that this star is a new member of the class of γ Cas analogs, the first one among the original category of Oe stars.

Original languageEnglish (US)
Article numberL9
JournalAstronomy and Astrophysics
Volume555
DOIs
StatePublished - 2013

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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