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We present in this paper the results of a 270 ks Chandra HETGS observation inthe context of a large multiwavelength campaign on the Seyfert galaxy Mrk 509.The HETGS spectrum allows us to study the high ionisation warm absorber and theFe-K complex in Mrk 509. We search for variability in the spectral propertiesof the source with respect to previous observations in this campaign, as wellas for evidence of ultra-fast outflow signatures. The Chandra HETGS X-rayspectrum of Mrk 509 was analysed using the SPEX fitting package. We confirm thebasic structure of the warm absorber found in the 600 ks XMM-Newton RGSobservation observed three years earlier, consisting of five distinctionisation components in a multikinematic regime. We find little or novariability in the physical properties of the different warm absorber phaseswith respect to previous observations in this campaign, except for component D2which has a higher column density at the expense of component C2 at the sameoutflow velocity (-240 km/s). Contrary to prior reports we find no -700 km/soutflow component. The O VIII absorption line profiles show an average coveringfactor of 0.81 +/- 0.08 for outflow velocities faster than -100 km/s, similarto those measured in the UV. This supports the idea of a patchy wind. Therelative metal abundances in the outflow are close to proto-solar. The narrowcomponent of the Fe Kalpha emission line shows no changes with respect toprevious observations which confirms its origin in distant matter. The narrowline has a red wing that can be interpreted to be a weak relativistic emissionline. We find no significant evidence of ultra-fast outflows in our newspectrum down to the sensitivity limit of our data.

Multiwavelength campaign on Mrk 509 XIV. Chandra HETGS spectra