{
  "id": "J/ApJ/889/117",
  "title_cds": "Hot subdwarf stars from Gaia DR2 & LAMOST DR6+7. I.",
  "title_create": "Lei+, 2020",
  "year": "2020",
  "author": "Lei Z., Zhao J., Nemeth P., Zhao G.",
  "title_pub": " Hot subdwarf stars identified in Gaia DR2 with spectra of LAMOST DR6 and DR7. I. Single-lined spectra.",
  "first_author": "Lei Z.",
  "bibcode": [
    "2020ApJ...889..117L"
  ],
  "ref_biblio": [
    "<Astrophys. J., 889, 117-117 (2020)>"
  ],
  "keyword_cds": [
    "Stars, subdwarf",
    "Abundances",
    "Spectral types"
  ],
  "keyword_pub": "Subdwarf stars; Stellar classification; Surveys",
  "abstract": [
    "182 single-lined hot subdwarf stars are identified by using spectra",
    "from the sixth and seventh data releases (DR6 and DR7) of the Large",
    "Sky Area Multi-Object Fibre Spectroscopic Telescope survey. We",
    "classified all the hot subdwarf stars using a canonical classification",
    "scheme, and got 89 sdB, 37 sdOB, 26 sdO, 24 He-sdOB, 3 He-sdO, and 3",
    "He-sdB stars, respectively. Among these stars, 108 hot subdwarfs are",
    "newly discovered, while 74 stars were reported by previous catalogs.",
    "The atmospheric parameters of these stars were obtained by fitting the",
    "hydrogen (H) and helium (He) lines with non-local thermodynamic",
    "equilibrium model atmospheres. The atmospheric parameters confirm the",
    "two He sequences and the two subgroups of He-sdOB stars in our",
    "samples, which were found by previous studies in the",
    "T_eff_-log(nHe/nH) diagram. Our results demonstrate different origins",
    "of field hot subdwarf stars and extreme horizontal branch stars in",
    "globular clusters, and provide strict observational limits on the",
    "formation and evolution models of the different sub-types of these",
    "evolved objects. Based on the results, we evaluated the completeness",
    "of the Geier+ (2017, J/A+A/600/A50) catalog. We found the fraction of",
    "hot subwarf stars is between 10% and 60%, depending on the brightness",
    "of the sample. A more accurate estimation for the hot subdwarf",
    "fraction can be obtained when similar results from composite spectra",
    "will become available."
  ],
  "curator": "Prepared by [AAS], Emmanuelle Perret [CDS]",
  "history": [
    "From electronic version of the journal"
  ],
  "see_also": [
    "III/137 : Spectroscopically Identified Hot Subdwarf Stars (Kilkenny+ 1988)",
    "VI/65   : Evolutionary models of evolved stars (Dorman+ 1993)",
    "III/258 : Revised and updated First Byurakan Survey (FBS) (Mickaelian, 2008)",
    "I/345   : Gaia DR2 (Gaia Collaboration, 2018)",
    "V/164   : LAMOST DR5 catalogs (Luo+, 2019)",
    "J/ApJ/419/596    : Pop I UV radiation models (Dorman+, 1993)",
    "J/MNRAS/287/867  : Edinburgh-Cape Blue Object Survey. Zone 1. (Kilkenny+ 1997)",
    "J/A+A/400/939    : Stellar parameters of 115 HQS sdB stars (Edelmann+, 2003)",
    "J/MNRAS/427/2180 : GALEX survey subdwarf atmospheric parameters (Nemeth+, 2012)",
    "J/A+A/565/A100   : NGC 288 hot horizontal branch stars abund. (Moehler+, 2014)",
    "J/MNRAS/446/4078 : New white dwarf stars in SDSS DR10 (Kepler+, 2015)",
    "J/A+A/576/A44    : Hot subdwarf binaries from MUCHFUSS (Kupfer+, 2015)",
    "J/ApJ/818/202    : Hot subdwarf stars in LAMOST DR1 (Luo+, 2016)",
    "J/MNRAS/455/3413 : New WD and subdwarf stars in SDSS DR12 (Kepler+, 2016)",
    "J/A+A/600/A50    : Catalog of hot subdwarf stars (Geier+, 2017)",
    "J/A+A/618/A15    : Parameters of EHB stars in {omega} Cen (Latour+, 2018)",
    "J/ApJ/868/70     : Hot subdwarf stars from Gaia DR2 and LAMOST DR5 (Lei+, 2018)",
    "J/A+A/621/A38    : Gaia catalogue of hot subluminous stars (Geier+, 2019)",
    "J/ApJ/881/135    : Hot subdwarf stars from Gaia2 & LAMOST DR5. II. (Lei+, 2019)",
    "http://www.lamost.org/ : LAMOST home page"
  ],
  "tables": [
    {
      "name": "table1.dat",
      "desc": "Information on the 182 hot subdwarf stars identified in this study"
    }
  ],
  "archive_date_creation": "06-Aug-2021",
  "catid": 18890117,
  "vizier_date_update": "08-Jul-2022",
  "xmatch": "J/ApJ/889/117/table1",
  "doi_pub": [
    "10.3847/1538-4357/ab660a"
  ],
  "orcid_pub": [
    "0000-0003-2362-6607"
  ],
  "doi_cds": "10.26093/cds/vizier.18890117",
  "type": [
    "OC"
  ],
  "archive_date_update": "24-Oct-2022",
  "uat": [
    "Subdwarf stars",
    "Chemical abundances",
    "Stellar spectral types"
  ],
  "ip_addr": "216.73.217.43",
  "data_access": "v-f"
}