SIMBAD references

2004A&A...420.1061D - Astronomy and Astrophysics, volume 420, 1061-1077 (2004/6-4)

Quasi-simultaneous XMM-Newton and VLA observation of the non-thermal radio emitter HD 168112 (O5.5III(f+)).

DE BECKER M., RAUW G., BLOMME R., WALDRON W.L., SANA H., PITTARD J.M., EENENS P., STEVENS I.R., RUNACRES M.C., VAN LOO S. and POLLOCK A.M.T.

Abstract (from CDS):

We report the results of a multiwavelength study of the non-thermal radio emitter HD 168112 (O5.5III(f+)). The detailed analysis of two quasi-simultaneous XMM-Newton and VLA observations reveals strong variability of this star both in the X-ray and radio ranges. The X-ray observations separated by five months reveal a decrease of the X-ray flux of ∼30%. The radio emission on the other hand increases by a factor 5-7 between the two observations obtained roughly simultaneously with the XMM-Newton pointings. The X-ray data reveal a hard emission that is most likely produced by a thermal plasma at kT∼2-3keV while the VLA data confirm the non-thermal status of this star in the radio waveband. Comparison with archive X-ray and radio data confirms the variability of this source in both wavelength ranges over a yet ill defined time scale. The properties of HD 168112 in the X-ray and radio domain point towards a binary system with a significant eccentricity and an orbital period of a few years. However, our optical spectra reveal no significant changes of the star's radial velocity suggesting that if HD 168112 is indeed a binary, it must be seen under a fairly low inclination.

Abstract Copyright:

Journal keyword(s): radiation mechanisms: non-thermal - stars: early-type - X-rays: stars - radio continuum: stars - stars: individual: HD 168112

CDS comments: Calibrator J1834-126 not identified.

Simbad objects: 11

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2020.06.03-23:43:53

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