A 500 pc volume-limited sample of hot subluminous stars: I. Space density, scale height, and population properties
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00587668" target="_blank" >RIV/67985815:_____/24:00587668 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0354880" target="_blank" >https://hdl.handle.net/11104/0354880</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/202348319" target="_blank" >10.1051/0004-6361/202348319</a>
Alternative languages
Result language
angličtina
Original language name
A 500 pc volume-limited sample of hot subluminous stars: I. Space density, scale height, and population properties
Original language description
We present the first volume-limited sample of spectroscopically confirmed hot subluminous stars out to 500 pc, defined using the accurate parallax measurements from the Gaia space mission data release 3 (DR3). The sample comprises a total of 397 members, with 305 (similar to 77%) identified as hot subdwarf stars, including 83 newly discovered systems. Of these, we observe that 178 (similar to 58%) are hydrogen-rich sdBs, 65 are sdOBs (similar to 21%), 32 are sdOs (similar to 11%), and 30 are He-sdO/Bs (similar to 10%). Among them, 48 (similar to 16%) exhibit an infrared excess in their spectral energy distribution fits, suggesting a composite binary system. The hot subdwarf population is estimated to be 90% complete, assuming that most missing systems are these composite binaries located within the main sequence (MS) in the Gaia colour-magnitude diagram. The remaining sources in the sample include cataclysmic variables, blue horizontal branch stars, hot white dwarfs, and MS stars. We derived the mid-plane density rho(0) and scale height h(z) for the non-composite hot subdwarf star population using a hyperbolic sechant profile (sech(2)). The best-fit values are rho(0) = 5.17 +/- 0.33 x 10(-7) stars pc(-3) and h(z) = 281 +/- 62 pc. When accounting for the composite-colour hot subdwarfs and their estimated completeness, the mid-plane density increases to rho(0) = 6.15(-0.53)(+1.16) x 10(-7) stars pc(-3). This corrected space density is an order of magnitude lower than predicted by population synthesis studies, supporting previous observational estimates.
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
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomy & Astrophysics
ISSN
0004-6361
e-ISSN
1432-0746
Volume of the periodical
686
Issue of the periodical within the volume
June
Country of publishing house
FR - FRANCE
Number of pages
21
Pages from-to
A25
UT code for WoS article
001231909000010
EID of the result in the Scopus database
2-s2.0-85190330949