New Hot Subdwarf Stars Identified in Gaia DR2 with LAMOST DR5 Spectra. II.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F19%3A00511508" target="_blank" >RIV/67985815:_____/19:00511508 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.3847/1538-4357/ab2edc" target="_blank" >https://doi.org/10.3847/1538-4357/ab2edc</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-4357/ab2edc" target="_blank" >10.3847/1538-4357/ab2edc</a>

Jazyk výsledku

angličtina

Název v původním jazyce

New Hot Subdwarf Stars Identified in Gaia DR2 with LAMOST DR5 Spectra. II.

Popis výsledku v původním jazyce

Together with the 294 hot subdwarf stars found by Lei et al., we identified 682 hot subdwarf stars in total by using the Gaia HR-diagram and LAMOST spectra. These results demonstrate the efficiency of our method to combine large surveys to search for hot subdwarf stars. We found a distinct gap in our He-sdOB stars based on their He abundance, which is also presented in extreme horizontal branch (EHB) stars of the globular cluster omega Cen. The number fraction of the sample size for the two subgroups is very different between the two counterparts. However, the distinct gap between the H-sdB stars and He-sdOB stars in omega Cen is not visible in our sample. More interestingly, the He-sdB population with the highest He abundance in our sample is completely missing in omega Cen. The discrepancy between our field hot subdwarf stars and the EHB stars in omega Cen indicate different origins for the two counterparts.

Název v anglickém jazyce

New Hot Subdwarf Stars Identified in Gaia DR2 with LAMOST DR5 Spectra. II.

Popis výsledku anglicky

Together with the 294 hot subdwarf stars found by Lei et al., we identified 682 hot subdwarf stars in total by using the Gaia HR-diagram and LAMOST spectra. These results demonstrate the efficiency of our method to combine large surveys to search for hot subdwarf stars. We found a distinct gap in our He-sdOB stars based on their He abundance, which is also presented in extreme horizontal branch (EHB) stars of the globular cluster omega Cen. The number fraction of the sample size for the two subgroups is very different between the two counterparts. However, the distinct gap between the H-sdB stars and He-sdOB stars in omega Cen is not visible in our sample. More interestingly, the He-sdB population with the highest He abundance in our sample is completely missing in omega Cen. The discrepancy between our field hot subdwarf stars and the EHB stars in omega Cen indicate different origins for the two counterparts.

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/GA18-20083S" target="_blank" >GA18-20083S: Gaia-GALEX přehled horkých podtrpaslíků</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Astrophysical Journal

ISSN

1538-4357

e-ISSN

—

Svazek periodika

881

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

135

Kód UT WoS článku

000482527100018

EID výsledku v databázi Scopus

2-s2.0-85072315871