Type I X-ray bursts’ spectra and fuel composition from the atoll and transient source 4U 1730–22
NICER observed two outbursts from the neutron star low-mass X-ray binary 4U 1730–22 in 2021 and 2022, which showed a similar spectral evolution in the hardness-intensity diagram. Seventeen type I X-ray bursts were identified in both outbursts. The X-ray burst spectra showed clear deviations from the...
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| Veröffentlicht in: | Astronomy and astrophysics (Berlin) 2023-02, Vol.670, p.A87 |
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| container_title | Astronomy and astrophysics (Berlin) |
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| creator | Lu, Yongqi Li, Zhaosheng Pan, Yuanyue Yu, Wenhui Chen, Yupeng Ji, Long Ge, Mingyu Zhang, Shu Qu, Jinlu Song, Liming Falanga, Maurizio |
| description | NICER observed two outbursts from the neutron star low-mass X-ray binary 4U 1730–22 in 2021 and 2022, which showed a similar spectral evolution in the hardness-intensity diagram. Seventeen type I X-ray bursts were identified in both outbursts. The X-ray burst spectra showed clear deviations from the blackbody model, firstly ∼10 s after onset. Adding the enhanced persistent emission due to the Poynting-Robertson drag or the reflection from the accretion disk both significantly improved the fitting results. We found that 12 out of 17 X-ray bursts showed the photospheric radius expansion (PRE) characteristic. Considering the nine PRE bursts out of ten X-ray bursts observed by Insight-HXMT, 78% of bursts from 4U 1730–22 exhibited PRE. According to the burst rise time, the duration, the local accretion rate, and the burst fuel composition estimated from recurrence time, we propose that these PRE bursts were powered by pure helium. From the touchdown flux of PRE bursts, we estimate the source distance of
d
= 7.54 ± 0.46(
X
= 0) kpc for a canonical neutron star with
M
NS
= 1.4
M
⊙
and
R
NS
= 10 km. |
| doi_str_mv | 10.1051/0004-6361/202244984 |
| format | Article |
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d
= 7.54 ± 0.46(
X
= 0) kpc for a canonical neutron star with
M
NS
= 1.4
M
⊙
and
R
NS
= 10 km.</description><identifier>ISSN: 0004-6361</identifier><identifier>EISSN: 1432-0746</identifier><identifier>DOI: 10.1051/0004-6361/202244984</identifier><language>eng</language><ispartof>Astronomy and astrophysics (Berlin), 2023-02, Vol.670, p.A87</ispartof><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c294t-26d004a873463823d0f3f20e9596b1fbb44eb7dc2590d18ecc045e96242fc22e3</citedby><cites>FETCH-LOGICAL-c294t-26d004a873463823d0f3f20e9596b1fbb44eb7dc2590d18ecc045e96242fc22e3</cites><orcidid>0000-0003-3095-6065 ; 0000-0003-2310-8105</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,3727,27924,27925</link.rule.ids></links><search><creatorcontrib>Lu, Yongqi</creatorcontrib><creatorcontrib>Li, Zhaosheng</creatorcontrib><creatorcontrib>Pan, Yuanyue</creatorcontrib><creatorcontrib>Yu, Wenhui</creatorcontrib><creatorcontrib>Chen, Yupeng</creatorcontrib><creatorcontrib>Ji, Long</creatorcontrib><creatorcontrib>Ge, Mingyu</creatorcontrib><creatorcontrib>Zhang, Shu</creatorcontrib><creatorcontrib>Qu, Jinlu</creatorcontrib><creatorcontrib>Song, Liming</creatorcontrib><creatorcontrib>Falanga, Maurizio</creatorcontrib><title>Type I X-ray bursts’ spectra and fuel composition from the atoll and transient source 4U 1730–22</title><title>Astronomy and astrophysics (Berlin)</title><description>NICER observed two outbursts from the neutron star low-mass X-ray binary 4U 1730–22 in 2021 and 2022, which showed a similar spectral evolution in the hardness-intensity diagram. Seventeen type I X-ray bursts were identified in both outbursts. The X-ray burst spectra showed clear deviations from the blackbody model, firstly ∼10 s after onset. Adding the enhanced persistent emission due to the Poynting-Robertson drag or the reflection from the accretion disk both significantly improved the fitting results. We found that 12 out of 17 X-ray bursts showed the photospheric radius expansion (PRE) characteristic. Considering the nine PRE bursts out of ten X-ray bursts observed by Insight-HXMT, 78% of bursts from 4U 1730–22 exhibited PRE. According to the burst rise time, the duration, the local accretion rate, and the burst fuel composition estimated from recurrence time, we propose that these PRE bursts were powered by pure helium. From the touchdown flux of PRE bursts, we estimate the source distance of
d
= 7.54 ± 0.46(
X
= 0) kpc for a canonical neutron star with
M
NS
= 1.4
M
⊙
and
R
NS
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d
= 7.54 ± 0.46(
X
= 0) kpc for a canonical neutron star with
M
NS
= 1.4
M
⊙
and
R
NS
= 10 km.</abstract><doi>10.1051/0004-6361/202244984</doi><orcidid>https://orcid.org/0000-0003-3095-6065</orcidid><orcidid>https://orcid.org/0000-0003-2310-8105</orcidid><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| source | Bacon EDP Sciences France Licence nationale-ISTEX-PS-Journals-PFISTEX; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; EDP Sciences |
| title | Type I X-ray bursts’ spectra and fuel composition from the atoll and transient source 4U 1730–22 |
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