Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...466.1018h&link_type=abstract
Astrophysical Journal v.466, p.1018
Astronomy and Astrophysics
Astronomy
19
Stars: Abundances, Stars: Agb And Post-Agb, Stars: Atmospheres, Stars: Early-Type, Stars: Individual Alphanumeric: Pg 0832+676
Scientific paper
We present high-resolution spectroscopic observations of the faint, hot star PG 0832+676, identified in a previous paper as an extremely distant young B-type object. A differential abundance analysis with respect to the Galactic B-type star HR 1886 shows near normal helium, nitrogen, and oxygen abundances while there is a systematic depletion of ˜0.4 dex in the abundances of other elements. Furthermore, our new high-resolution observations show this object to be extremely sharp lined (v sin i ˜ 1 km s-1), and we therefore conclude that the star is an old, evolved low-mass star, either in the postasymptotic giant branch phase or more probably evolving off the blue horizontal branch. We suggest that such sharp-lined spectra from hot stars provide a unique and critical test for model atmospheric analyses, particularly with respect to the micro turbulent velocity parameter.
Brown Paul J. F.
Dufton Philip L.
Hambly Nigel C.
Keenan Francis P.
Peterson Ruth C.
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