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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28225
Title: A young contracting white dwarf in the peculiar binary HD 49798/RX J0648.0-4418?
Authors: Popov, S. B.
MEREGHETTI, Sandro 
Blinnikov, S. I.
Kuranov, A. G.
Yungelson, L. R.
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 474
Issue: 2
First Page: 2750
Abstract: HD 49798/RX J0648.0-4418 is a peculiar X-ray binary with a hot subdwarf (sdO) mass donor. The nature of the accreting compact object is not known, but its spin period P = 13.2 s and \dot{P} =-2.15 × 10^{-15} s s<SUP>-1</SUP> proves that it can be only either a white dwarf or a neutron star. The spin-up has been very stable for more than 20 yr. We demonstrate that the continuous stable spin-up of the compact companion of HD 49798 can be best explained by contraction of a young white dwarf with an age ∼2 Myr. This allows us to interpret all the basic parameters of the system in the framework of an accreting white dwarf. We present examples of binary evolution, which result in such systems. If correct, this is the first direct evidence for a white dwarf contraction in early evolutionary stages.
URI: http://hdl.handle.net/20.500.12386/28225
URL: https://academic.oup.com/mnras/article/474/2/2750/4622972
ISSN: 0035-8711
DOI: 10.1093/mnras/stx2910
Bibcode ADS: 2018MNRAS.474.2750P
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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