Dolidze 25 - A metal-deficient galactic open cluster

Details Dolidze 25 - A metal-deficient galactic open cluster Dolidze 25 - A metal-deficient galactic open cluster

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...240..349l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 240, no. 2, Dec. 1990, p. 349-356. Research supported by SERC.

Astronomy and Astrophysics

Astrophysics

32

Astronomical Spectroscopy, B Stars, O Stars, Open Clusters, Abundance, Metallicity, Spectral Line Width, Stellar Composition, Stellar Spectrophotometry, Thermodynamic Equilibrium

Scientific paper

High resolution spectra of three OB-type stars in the distant (5-6 kpc) anticenter galactic cluster Dolidze 25 have been analyzed using non-LTE and LTE model atmosphere techniques to derive atmospheric parameters and chemical compositions, respectively. The cluster appears to be significantly deficient in metals, with one star having underabundances for individual elements ranging from -0.55 to -0.93 dex with respect to the spectroscopic standard Tau Scorpii. This in conjunction with previous work on galactic clusters (Fitzsimmons et al. 1990, Gehren et al. 1985) implies that the variation of abundance with galactocentric distance is not linear and indeed may not be unique.

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