An18.9 min blue large-amplitude pulsator crossing the 'Hertzsprung gap' of hot subdwarfs

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

An18.9 min blue large-amplitude pulsator crossing the 'Hertzsprung gap' of hot subdwarfs

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

An18.9 min blue large-amplitude pulsator crossing the 'Hertzsprung gap' of hot subdwarfs

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GA22-34467S" target="_blank" >GA22-34467S: Interakce dvojhvězd na větvi červených obrů: horcí podtrpaslíci jako testovací případ.</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Nature Astronomy

ISSN

2397-3366

e-ISSN

2397-3366

Svazek periodika

7

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

11

Strana od-do

223-233

Kód UT WoS článku

000863153200002

EID výsledku v databázi Scopus

2-s2.0-85138998652