The stellar metallicity distribution in intermediate latitude fields with BATC and SDSS data

Details The stellar metallicity distribution in intermediate latitude fields with BATC and SDSS data The stellar metallicity distribution in intermediate latitude fields with BATC and SDSS data

2011-11-21

arxiv.org/abs/1111.4719v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Scientific paper

Based on the Beijing-Arizona-Taiwan-Connecticut (BATC) and Sloan Digital Sky Survey (SDSS) photometric data, we adopt SEDs fitting Method to evaluate the metallicity distribution for \sim40,000 main-sequence stars in the Galaxy. According to the derived photometric metallicities of these sample stars, we find that the metallicity distribution shift from metal-rich to metal-poor with the increase of distance from the Galactic center. The mean metallicity is about of 1.5 \pm 0.2dex in the outer halo and 1.3 \pm 0.1 dex in the inner halo. The mean metallicity smoothly decreases from -0.4 to -0.8 in interval 0 < r \leq 5 kpc. The fluctuation in the mean metallicity with Galactic longitude can be found in interval 4 < r \leq 8 kpc. There is a vertical abundance gradients d[Fe/H]/dz\sim -0.21 \pm 0.05 dex kpc-1 for the thin disk (z \leq 2 kpc). At distance 2 < z \leq 5 kpc, where the thick disk stars are dominated, the gradients are about of -0.16 \pm0.06 dex kpc-1, it can be interpreted as a mixture of stellar population with different mean metallicities at all z levels. The vertical metallicity gradient is - 0.05 \pm0.04 dex kpc-1 for the halo (z > 5 kpc). So there is little or no metallicity gradient in the halo.

Affiliated with

Also associated with

No associations

Rating

The stellar metallicity distribution in intermediate latitude fields with BATC and SDSS data 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 The stellar metallicity distribution in intermediate latitude fields with BATC and SDSS data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The stellar metallicity distribution in intermediate latitude fields with BATC and SDSS data will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-375778