Late B-type stars and their candidate companions resolved with Chandra ?

@article{Stelzer2003LateBS,
  title={Late B-type stars and their candidate companions resolved with Chandra ?},
  author={Beate Stelzer and Nuria Huelamo and Swetlana Hubrig and Hans Zinnecker and G.I.F.C.O.C.N.R. Palermo and - Eso Chile and - AI Potsdam},
  journal={Astronomy and Astrophysics},
  year={2003},
  volume={407},
  pages={1067-1078}
}
We present the first results from a series of Chandra observations carried out with the aim to examine the origin of X-ray emission in main-sequence late B-type stars. X-ray detections of late-B and early A-type stars have remained a mystery as none of the two major theories for stellar X-ray emission applies in this spectral range: while O- and early B-type stars drive strong winds that are subject to instabilities, late-type stars produce X-rays as a result of magnetic dynamo action. Since… 

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References

SHOWING 1-10 OF 47 REFERENCES

ADONIS observations of hard X-ray emitting late B-type stars in Lindroos systems

We present adaptive optics JHK S imaging observations of three main-sequence late B-type stars listed in the Lindroos Catalogue: HD 123445, HD 127971 and HD 129791. Given their spectral types, these

ROSAT detections of X-ray emission from young B-type stars

We present first results of a series of pointings of the Rosat HRI at visual binaries consisting of a B-star with a later-type companion. The binaries selected for this study are very likely physical

THE X-RAY EMISSION OF A-TYPE STARS

From X-ray images in the ROSAT public archives, we determine soft X-ray fluxes, or flux upper limits, for 74 A-type stars, which have been observed during deep integrations with the PSPC. Nine

An Einstein Observatory X-ray survey of main-sequence stars with shallow convection zones

The results of an X-ray survey of bright late A and early F stars on the main B-V sequence between 0.1 and 0.5 are presented. All the stars were observed with the Einstein Observatory for a period of

X-ray studies of coeval star samples. II - The Pleiades cluster as observed with the Einstein Observatory

Coronal X-ray emission of the Pleiades stars is investigated, and maximum likelihood, integral X-ray luminosity functions are computed for Pleiades members in selected color-index ranges. A detailed

Einstein Observations of T Tauri Stars in Taurus-Auriga. II. Relationships between X-Ray Emission and Pre-Main-Sequence Activity

On the basis of the full set of reanalyzed Einstein IPC X-ray data on Tau-Aur pre-main-sequence stars, presented in a companion paper, we have studied the relationships between the X-ray emission and

X-ray emission from young stars in Taurus-Auriga-Perseus: Luminosity functions and the rotation - activity - age - relation

We report on a systematic search for X-ray emission from pre-main sequence and young main sequence stars in the Taurus-Auriga-Perseus region. Our stellar sample consists of all T Tauri stars from the

An Einstein Observatory SAO-based catalog of B-type stars

About 4000 X-ray images obtained with the Einstein Observatory are used to measure the 0.16-4.0 keV emission from 1545 B-type SAO stars falling in the about 10 percent of the sky surveyed with the

Chandra Observations of the Pleiades Open Cluster: X-Ray Emission from Late B- to Early F-Type Binaries

We present the analysis of a 38.4 and 23.6 ks observation of the core of the Pleiades open cluster. The Advanced CCD Imaging Spectrometer on board the Chandra X-Ray Observatory detected 99 X-ray

Detection of a dozen X-ray-emitting main-sequence B6-A3 stars in Orion

The detection of 12 X-ray-emitting main-sequence B6-A3 stars in the Orion Nebula is reported. The luminosity of these stars in the 0.2-3.5 keV band is considerably in excess of field stars of the