SIMBAD references

2012ApJ...746..142N - Astrophys. J., 746, 142 (2012/February-3)

High-resolution X-ray spectroscopy of the magnetic of?p star HD 148937.


Abstract (from CDS):

High-resolution data of the peculiar magnetic massive star HD 148937 were obtained with Chandra-HETGS, and are presented here in combination with a re-analysis of the older XMM-RGS data. The lines of the high-Z elements (Mg, Si, S) were found to be unshifted and relatively narrow (FWHM of about 800 km/s), i.e., narrower than the O line recorded by RGS, which possibly indicates that the hot plasma is multi-thermal and has several origins. These data further indicate a main plasma temperature of about 0.6 keV and a formation of the X-ray emission at about one stellar radius above the photosphere. From the spectral fits and the H-to-He line ratios, the presence of very hot plasma is, however, confirmed, though with a smaller relative strength than for the prototype magnetic oblique rotator θ1 Ori C. Both stars thus share many similarities, but HD 148937 appears less extreme than θ1 Ori C despite also having a large magnetic confinement parameter.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: individual: HD148937 - stars: massive - X-rays: stars

Status at CDS:  

Simbad objects: 12

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