Contents
Images
Upload your image
DSS Images Other Images
Related articles
Supergiants and the Galactic metallicity gradient. II - Spectroscopic abundances for 64 distant F- to M-type supergiants The metallicity gradient in the Galactic disk from in situ stars withvisual magnitude ranging from 6 to 10 is analyzed. Atmosphericparameters and detailed chemical abundances for 64 Population Isupergiants of spectral types F through M and luminosity classes Iathrough II have been determined. The derived Fe/H ratios ranging from-0.5 to + 0.7 show a mean value of +0.13 with an estimated uncertaintyof + or - 0.2. A subset of 25 supergiants fainter than 7th magnitudelying in the direction of the Galactic center shows a Fe/H mean of +0.18+ or - 0.04, while a similar sample of 15 faint supergiants lying in thedirection of the Galactic anticenter shows a lower Fe/H mean of +0.07 +or - 0.06. For a sample of bright supergiants analyzed by Luck andLambert (1985), the mean abundance pattern for all 64 stars showed thefollowing: deficient C and O along with enhancement of N, indicatingmixing of CNO-cycled material to the stellar surfaces; an apparent Srenhancement attributed to departures from LTE; and an essentially solarpattern of other chemical elements.
|
Submit a new article
Related links
Submit a new link
Member of following groups:
|
Observation and Astrometry data
Constellation: | Stier |
Right ascension: | 05h36m38.73s |
Declination: | +18°56'13.4" |
Apparent magnitude: | 7.786 |
Proper motion RA: | 0.9 |
Proper motion Dec: | -2.5 |
B-T magnitude: | 9.407 |
V-T magnitude: | 7.92 |
Catalogs and designations:
|