Abstract
view Abstract Citations (51) References (45) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Model Atmosphere Analysis of the Faint Early-Type Halo Star PHL 346 Keenan, F. P. ; Lennon, D. J. ; Brown, P. J. F. ; Dufton, P. L. Abstract Stellar equivalent widths and hydrogen line profiles, measured from high-resolution optical spectra obtained with the 2.5 m Issac Newton Telescope, are used in conjunction with model atmosphere calculations to determine the atmospheric parameters and chemical composition of the faint, high galactic latitude early-type star PHL 346. The effective temperature (Teff = 22,600 + or - 1000 K) and surface gravity (log g = 3.6 + or - 0.2), as well as the chemical composition, are found to be similar to those of normal OB stars. Therefore, it is concluded that PHL 346 is an ordinary Population I object, at a z distance of 8.7 + or - 1.5 kpc. The relatively small stellar velocity in the z-direction (Vz = +56 + or - 10 km/s) then implies that PHL 346 must have been formed in the halo, possibly from galactic fountain material at a z distance of about 6 kpc. Publication: The Astrophysical Journal Pub Date: August 1986 DOI: 10.1086/164454 Bibcode: 1986ApJ...307..694K Keywords: Atmospheric Models; Early Stars; Stellar Atmospheres; Absorption Spectra; Halos; High Resolution; Optical Measurement; Spectral Line Width; Astrophysics; STARS: ATMOSPHERES; STARS: EARLY-TYPE; STARS: INDIVIDUAL ALPHANUMERIC: PHL 346 full text sources ADS | data products SIMBAD (1)
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