UITBOC 1574: A Very Distant Helium‐poor Subdwarf O Star | Zendy

Mark Seibert | Zendy; P. Chayer | Zendy; G. R. Meurer | Zendy; R. A. Saffer | Zendy; R. Napiwotzki | Zendy

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UITBOC 1574: A Very Distant Helium‐poor Subdwarf O Star

Author(s) -

Mark Seibert,

P. Chayer,

G. R. Meurer,

R. A. Saffer,

R. Napiwotzki

Publication year - 2001

Publication title -

publications of the astronomical society of the pacific

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.294

H-Index - 172

eISSN - 1538-3873

pISSN - 0004-6280

DOI - 10.1086/322915

Subject(s) - subdwarf , astrophysics , physics , balmer series , white dwarf , helium , population , line (geometry) , horizontal branch , spectral line , galactic plane , effective temperature , astronomy , stars , emission spectrum , metallicity , atomic physics , demography , mathematics , sociology , geometry

We have obtained the optical spectrum (3750-7500 A u ) and ultraviolet fluxes at 1521 and 2260 A u for the quasar candidate UITBOC 1574. The optical spectrum shows strong Balmer absorption lines through at least and the He ii line at 4686 A u . We compared the optical spectrum with non-LTE stellar atmosphere n p 9 models and find K, , and helium abundance T p 46,900 3,000 log g p 5.6 0.3 log (He/H) p 2.0

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