An18.9 min blue large-amplitude pulsator crossing the 'Hertzsprung gap' of hot subdwarfs
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F23%3A00566329" target="_blank" >RIV/67985815:_____/23:00566329 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1038/s41550-022-01783-z" target="_blank" >https://doi.org/10.1038/s41550-022-01783-z</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1038/s41550-022-01783-z" target="_blank" >10.1038/s41550-022-01783-z</a>
Alternative languages
Result language
angličtina
Original language name
An18.9 min blue large-amplitude pulsator crossing the 'Hertzsprung gap' of hot subdwarfs
Original language description
We report a comprehensive study of the peculiar BLAP discovered by the Tsinghua University-Ma Huateng Telescopes for Survey (TMTS), namely, TMTS J035143.63+584504.2 (TMTS-BLAP-1). This new BLAP has an 18.9 min pulsation period and is similar to the BLAPs with a low surface gravity and extended helium-enriched envelope, suggesting that it is a low-gravity BLAP at the shortest-period end. In particular, the long-term monitoring data reveal that this pulsating star has an unusually large rate of period change, namely, P ̇ /P = 2.2 × 10-6 yr-1. Such a significant and positive value challenges its origins from both helium-core pre-white-dwarfs and core helium-burning subdwarfs, but is consistent with that derived from shell helium-burning subdwarfs. The particular pulsation period and unusual rate of period change indicate that TMTS-BLAP-1 is at a short-lived (~106 yr) phase of shell helium ignition before the stable shell helium burning, in other words, TMTS-BLAP-1 is going through a `Hertzsprung gap' of hot subdwarfs.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/GA22-34467S" target="_blank" >GA22-34467S: Binary interaction on the red giant branch: Hot subdwarfs as a test case.</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Nature Astronomy
ISSN
2397-3366
e-ISSN
2397-3366
Volume of the periodical
7
Issue of the periodical within the volume
2
Country of publishing house
DE - GERMANY
Number of pages
11
Pages from-to
223-233
UT code for WoS article
000863153200002
EID of the result in the Scopus database
2-s2.0-85138998652