2006/12/18 by R. Iaria, T. Di Salvo, G. Lavagetto +3
Physics and Astronomy · #Absorption (acoustics) #Accretion (finance) #Accretion disc #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Corona (planetary geology) #Emission spectrum #Line (geometry) #RADIUS #Spectral line #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1051/0004-6361:20065644
8 pages, 10 figs, accepted by A&A on 6 December 2006
openalex publication_date 2006/12/18 · arxiv created 2006/12/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present the results of a 53 ks long Chandra observation of the dipping source XB 1254–690. During the observation neither bursts or dips were observed. From the zero-order image we estimated the precise X-ray coordinates of the source with a 90% uncertainty of 0.6´´. Since the lightcurve did not show any significant variability, we extracted the spectrum corresponding to the whole observation. We confirmed the presence of the Kα absorption lines with a larger accuracy with respect to the previous XMM EPIC pn observation. Assuming that the line width were due to a bulk motion or a turbulence associated to the coronal activity, we estimate that the lines were produced in a photoionized absorber between the coronal radius and the outer edge of the accretion disk.