He-rich hot subdwarf stars observed in Gaia DR3 and LAMOST DR7: Carbon and nitrogen abundances and kinematics
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00584412" target="_blank" >RIV/67985815:_____/24:00584412 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0353290" target="_blank" >https://hdl.handle.net/11104/0353290</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/1538-4365/ad1ab2" target="_blank" >10.3847/1538-4365/ad1ab2</a>
Alternative languages
Result language
angličtina
Original language name
He-rich hot subdwarf stars observed in Gaia DR3 and LAMOST DR7: Carbon and nitrogen abundances and kinematics
Original language description
We conducted an analysis of the abundances of He, C, and N in 210 He-rich hot subdwarfs observed within both the Gaia Data Release 3 (DR3) and LAMOST DR7 data sets. This analysis involved fitting the LAMOST spectra with Tlusty/Synspec non-LTE synthetic spectra. By examining the Galactic spatial positions, velocity vectors, and orbital parameters of these stars, we determined their Galactic population memberships utilizing LAMOST radial velocities and Gaia DR3 parallaxes along with proper motions. Our investigation revealed two positive correlations of C and one positive correlation of N with respect to the He abundance. We found a clear C abundance dichotomy where approximately 82% of the stars show N enrichment above the solar value. Moreover, we observed a bimodal distribution of C abundances, prominently evident in both the Galactic thin and thick disks but absent in the halo population. Furthermore, we found that the scenario of the merger channel of double helium white dwarfs is inadequate to explain the formation of C-deficient He-rich 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
—
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
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astrophysical Journal Supplement Series
ISSN
0067-0049
e-ISSN
1538-4365
Volume of the periodical
271
Issue of the periodical within the volume
1
Country of publishing house
US - UNITED STATES
Number of pages
14
Pages from-to
21
UT code for WoS article
001171934500001
EID of the result in the Scopus database
2-s2.0-85188217643