On its way to the neutron star-white dwarf binary graveyard, IGR J16194-2810, a first ascent M giant X-ray binary
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866917656596054016 |
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| author | Hinkle, K. H. Fekel, F. C. Straniero, O. Maas, Z. G. Joyce, R. R. Lebzelter, T. Muterspaugh, M. W. Sowell, J. R. |
| author_facet | Hinkle, K. H. Fekel, F. C. Straniero, O. Maas, Z. G. Joyce, R. R. Lebzelter, T. Muterspaugh, M. W. Sowell, J. R. |
| contents | A single-lined spectroscopic orbit for the M giant in the X-ray binary IGR J16194-2810 is determined from a time-series of optical spectra. The spectroscopic orbital period of 192.5 days is twice that of the photometric period, confirming that the M giant in the system is an ellipsoidal variable. The giant is identified as a first ascent giant approaching the red giant tip. The primary is a neutron star (NS) with its M giant companion filling its Roche lobe verifying the system classification as a Low-Mass X-ray binary (LMXB). Stellar C, N, O and Fe abundances are derived for the M giant with the C, N, O values typical for a field giant with [Fe/H] = -0.14. The system does not have a large kick velocity. Models for the evolution of the system into a binary NS-white dwarf (WD) are presented. The X-ray properties are discussed in the context of this model. This binary is a rare example of a luminous, long orbital period, LMXB early in the transient ellipsoidal phase. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2405_02270 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | On its way to the neutron star-white dwarf binary graveyard, IGR J16194-2810, a first ascent M giant X-ray binary Hinkle, K. H. Fekel, F. C. Straniero, O. Maas, Z. G. Joyce, R. R. Lebzelter, T. Muterspaugh, M. W. Sowell, J. R. Solar and Stellar Astrophysics High Energy Astrophysical Phenomena A single-lined spectroscopic orbit for the M giant in the X-ray binary IGR J16194-2810 is determined from a time-series of optical spectra. The spectroscopic orbital period of 192.5 days is twice that of the photometric period, confirming that the M giant in the system is an ellipsoidal variable. The giant is identified as a first ascent giant approaching the red giant tip. The primary is a neutron star (NS) with its M giant companion filling its Roche lobe verifying the system classification as a Low-Mass X-ray binary (LMXB). Stellar C, N, O and Fe abundances are derived for the M giant with the C, N, O values typical for a field giant with [Fe/H] = -0.14. The system does not have a large kick velocity. Models for the evolution of the system into a binary NS-white dwarf (WD) are presented. The X-ray properties are discussed in the context of this model. This binary is a rare example of a luminous, long orbital period, LMXB early in the transient ellipsoidal phase. |
| title | On its way to the neutron star-white dwarf binary graveyard, IGR J16194-2810, a first ascent M giant X-ray binary |
| topic | Solar and Stellar Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2405.02270 |