F stars - Evidence for 'two-dimensional' age-metallicity relation and a new light on the enrichment history of the solar neighbourhood

Details F stars - Evidence for 'two-dimensional' age-metallicity relation and a new light on the enrichment history of the solar neighbourhood F stars - Evidence for 'two-dimensional' age-metallicity relation and a new light on the enrichment history of the solar neighbourhood

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.172...51m&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 172, no. 1, Oct. 1990, p. 51-75.

Astronomy and Astrophysics

Astrophysics

22

F Stars, Galactic Evolution, Metallicity, Solar Neighborhood, Stellar Evolution, G Stars, Main Sequence Stars, Milky Way Galaxy, Open Clusters, Stellar Temperature

Scientific paper

From the uvby photometry and proper motions for about 5500 nearby F stars we ha'c'e found the following: (i) F stars, taken in narrow ranges of metafficity, show at [Fe/H] <0 rather distinct cut-off in their distribution along the Main Sequence (MS) at the blue side, which is suggested to be an indication for the MS turn-off in stellar groups of fixed metafficity; (ii) the corresponding turn-off age from theoretical isochrones strongly correlates with the mean peculiar velocity of the turn-off stars; (iii) the sub-groups of stars of different colours have essentially the same mean peculiar velocity at low metallicity, but at high metallicity the velocities of the `red' subgroups are much larger than those of the `blue' ones. We argue that these properties of F stars lead to a `two-dimensional' age-metafficity relation with the following main features: (i) a very large spread of metal abundance for old stars, (ii) narrowing of the metallicity range toward younger ages, (iii) increase of mean metallicity toward younger ages. This AMR seems to require a major revision of current models of the chemical evolution of the Galaxy: it suggests that the spatial distribution of metal abundance in the interstellar medium was initially highly inhomogeneous, the inhomo- geneities being smoothed out and the mean metallicity being increased as the time went on. We also find an evidence for the evolution of the gaseous matter, from which the open clusters are formed, to be somehow decoupled from the evolution of the overall ISM

Affiliated with

Also associated with

No associations

Rating

F stars - Evidence for 'two-dimensional' age-metallicity relation and a new light on the enrichment history of the solar neighbourhood does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with F stars - Evidence for 'two-dimensional' age-metallicity relation and a new light on the enrichment history of the solar neighbourhood, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and F stars - Evidence for 'two-dimensional' age-metallicity relation and a new light on the enrichment history of the solar neighbourhood will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1301946