Elemental abundance analyses with coadded Dominion Astrophysical Observatory spectrograms - III. The superficially normal standard stars theta Leonis, tau Herculis and omicron Pegasi.
Abstract
Summary. Elemental abundance analyses were performed for three superficially normal main-sequence stars θ Leonis (A2V), τ Herculus (B5IV) and ο Pegasi (A1IV). These studies used coadded spectrograms produced from at least 12 2.4 Å IIaO Dominion Astrophysical Observatory spectrograms and show a greater degree of internal consistency and smaller microturbulent velocities than previous studies of these stars which used lower signal-to-noise data. Many lines not previously seen were identified including some of new atomic species whose analysis provide a more complete picture of the elemental abundances. The identification and analysis of La ii lines (and possibly those of several other lanthanides) in ο Peg link this star more closely with the classical metallic-lined (Am) stars, although there are considerable differences in abundances. Some of θ Leo's elemental abundances, particularly those of vanadium, strontium, and zirconium, are significantly different from solar in confirmation of previous analyses. τ Her's elemental abundances are typically a factor of 2 less than solar. The random errors in the derived abundances are probably less than a factor of 2.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- February 1988
- DOI:
- 10.1093/mnras/230.4.671
- Bibcode:
- 1988MNRAS.230..671A
- Keywords:
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- Abundance;
- Astronomical Spectroscopy;
- Main Sequence Stars;
- Spectrograms;
- Stellar Composition;
- Fine Structure;
- Interstellar Chemistry;
- Lanthanum;
- Line Spectra;
- Metallicity;
- Signal To Noise Ratios;
- Astrophysics