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Testing the companion hypothesis for the origin of the X-ray emission from intermediate-mass main-sequence stars
| Content Provider | Semantic Scholar |
|---|---|
| Author | Stelzer, Beate Micela, Giuseppina Hubrig, Swetlana |
| Copyright Year | 2006 |
| Abstract | Context. The X-ray emission from B-type main-sequence stars is a long sta ding mystery in stellar coronal research. Since there i s no theory at hand that explains intrinsic X-ray emission from interme diate-mass main-sequence stars, the observations have oft en been interpreted in terms of (unknown) late-type magnetically active companio n stars. Aims. Resolving the hypothesized companions requires high spati al resolution observations in the infrared and in X-rays. We us Chandra imaging observations to spatially resolve a sample of mainsequence B-type stars with recently discovered companions at arcsecond separation. Methods. Our strategy is to search for X-ray emission at the position o f both the B-type primary and the faint companion. Results. We find that all spatially resolved companions are X-ray emit ters, but seven out of eleven intermediate-mass stars are al so X-ray sources. If this emission is interpreted in terms of ad ditional sub-arcsecond or spectroscopic companions, this implies a high multiplicity of B-type stars. Firm results on B star multipl icity pending, the alternative, that B stars produce intrin sic X-rays, can not be discarded. The appropriate scenario in this vein is proba bly magnetically confined wind, as suggested for the X-ray e mission of the magnetic Ap star IQ Aur. However, the only Ap star in the Chand r sample is not detected in X-rays, and therefore does not su pport this picture. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.astropa.unipa.it/Library/OAPA_preprints/aa4405.ps.gz |
| Alternate Webpage(s) | http://arxiv.org/pdf/astro-ph/0602517v1.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | ABRA gene Diagnostic radiologic examination GUCY2C protein, human Radiation Second Unit of Plane Angle Standard Industrial Classification Star Trek: Stars, Celestial Stellar (payment network) X-Ray (Amazon Kindle) multiplicity |
| Content Type | Text |
| Resource Type | Article |
