Issue |
A&A
Volume 657, January 2022
|
|
---|---|---|
Article Number | A58 | |
Number of page(s) | 8 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361/202141608 | |
Published online | 10 January 2022 |
Broad-band analysis of X-ray pulsar 2S 1845–024
1
Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
e-mail: armin.nabizadeh@utu.fi
2
Space Research Institute of the Russian Academy of Sciences, Profsoyuznaya Str. 84/32, Moscow 117997, Russia
3
School of Physics and Astronomy, Sun Yat-Sen University, Zhuhai, Guangdong 519082, PR China
4
Nordita, KTH Royal Institute of Technology and Stockholm University, 10691 Stockholm, Sweden
Received:
21
June
2021
Accepted:
12
October
2021
We present the results of a detailed investigation of the poorly studied X-ray pulsar 2S 1845−024 based on data obtained at the NuSTAR observatory during the type I outburst in 2017. Neither pulse phase-averaged nor phase-resolved spectra of the source show evidence for a cyclotron absorption feature. We also used data obtained from other X-ray observatories (Swift, XMM-Newton and Chandra) to study the spectral properties as a function of orbital phase. The analysis reveals a high hydrogen column density for the source reaching ∼1024 cm−2 around periastron. Using high-quality Chandra data we were able to obtain an accurate localization of 2S 1845−024 at RA = 18h48m16.s8 and Dec = −2°25′25.″1 (J2000), which allowed us to use infrared (IR) data to roughly classify the optical counterpart of the source as an OB supergiant at a distance of ≳15 kpc.
Key words: accretion, accretion disks / magnetic fields / pulsars: individual: 2S 1845–024 / stars: neutron / X-rays: binaries
© ESO 2022
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