2020A&A...641A.144L


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.28CET22:06:42

2020A&A...641A.144L - Astronomy and Astrophysics, volume 641A, 144-144 (2020/9-1)

High-resolution X-ray spectroscopy of the stellar wind in Vela X-1 during a flare.

LOMAEVA M., GRINBERG V., GUAINAZZI M., HELL N., BIANCHI S., BISSINGER M., FURST F., KRETSCHMAR P., MARTINEZ-CHICHARRO M., MARTINEZ-NUNEZ S. and TORREJON J.M.

Abstract (from CDS):


Context. We present a ∼130 ks observation of the prototypical wind-accreting, high-mass X-ray binary Vela X-1 collected with XMM-Newton at orbital phases between 0.12 and 0.28. A strong flare took place during the observation that allows us to investigate the reaction of the clumpy stellar wind to the increased X-ray irradiation.
Aims. To examine the wind's reaction to the flare, we performed both time-averaged and time-resolved analyses of the RGS spectrum and examined potential spectral changes.
Methods. We focused on the high-resolution XMM-Newton RGS spectra and divided the observation into pre-flare, flare, and post-flare phases. We modeled the time-averaged and time-resolved spectra with phenomenological components and with the self-consistent photoionization models calculated via CLOUDY and XSTAR in the pre-flare phase, where strong emission lines due to resonant transitions of highly ionized ions are seen.
Results. In the spectra, we find emission lines corresponding to K-shell transitions in highly charged ions of oxygen, neon, magnesium, and silicon as well as radiative recombination continua (RRC) of oxygen. Additionally, we observe potential absorption lines of magnesium at a lower ionization stage and features identified as iron L lines. The CLOUDY and XSTAR photoionization models provide contradictory results, either pointing towards uncertainties in theory or possibly a more complex multi-phase plasma, or both .
Conclusions. We are able to demonstrate the existence of a plethora of variable narrow features, including the firm detection of oxygen lines and RRC that RGS enables to observe in this source for the first time. We show that Vela X-1 is an ideal source for future high-resolution missions, such as XRISM and Athena.

Abstract Copyright: © ESO 2020

Journal keyword(s): stars: massive - stars: winds, outflows - X-rays: binaries

Simbad objects: 5

goto Full paper

goto View the reference in ADS

Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* V662 Cas HXB 01 18 02.6973905772 +65 17 29.829417242 12.27 11.99 11.14 10.33 9.58 B1Iae 233 0
2 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 1978 1
3 V* GP Vel HXB 09 02 06.8610736194 -40 33 16.896402010 6.85 7.37 6.87 6.31 6.05 B0.5Ia 1380 0
4 HD 153919 HXB 17 03 56.7728262865 -37 50 38.912077679 6.06 6.78 6.51 6.08 5.90 O6Iafcp 762 1
5 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3957 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2020A&A...641A.144L and select 'bookmark this link' or equivalent in the popup menu


2020.11.28-22:06:42

© Université de Strasbourg/CNRS

    • Contact