The age and metallicity of the bötes i system
Astronomical Journal, ISSN: 0004-6256, Vol: 136, Issue: 6, Page: 2321-2331
2008
- 10Citations
- 3Captures
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Article Description
We present Washington CT T photometry of a field central to the Boötes I dwarf spheroidal galaxy, which was discovered as a stellar overdensity in the Sloan Digital Sky Survey (DR5). We show that the Washington filters are much more effective than the Sloan filters in separating the metal-poor turn-off stars in the dwarf galaxy from the foreground stars. We detect 165 objects in the field, and statistically determine that just over 40% of the objects are nonmembers. Our statistical analysis mostly agrees with radial velocity measurements of the brighter stars. We find that there is a distinct main-sequence turn-off and subgiant branch, where there is some evidence of a spread in chemical abundance. Any evidence of an age spread is limited to a few billion years. The brightest seven Boötes I members give a (photometric-color derived) weighted mean iron abundance of [Fe/H] = -2.1 , and the best-fit isochrone is the 14.1 Gyr, Z = 0.0002 model, with (m - M) = 19.11 and E(B - V) = 0.02. © 2008. The American Astronomical Society. All rights reserved.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=66149157284&origin=inward; http://dx.doi.org/10.1088/0004-6256/136/6/2321; https://iopscience.iop.org/article/10.1088/0004-6256/136/6/2321; https://dx.doi.org/10.1088/0004-6256/136/6/2321; https://validate.perfdrive.com/9730847aceed30627ebd520e46ee70b2/?ssa=04dae0c8-65ed-4177-97f9-2a3c3547fcf1&ssb=33583295494&ssc=https%3A%2F%2Fiopscience.iop.org%2Farticle%2F10.1088%2F0004-6256%2F136%2F6%2F2321&ssi=4cf0e10a-cnvj-4723-8841-17d8232ade7c&ssk=botmanager_support@radware.com&ssm=895085746629675869362329548415358981&ssn=2124a0be41e3b94765f5e8ec83a6acb7e60f0900c3c4-8990-4f21-af88c7&sso=61bfbf8c-bc564dd29dea61ac3475eb695f43cf01fac978db224f9d64&ssp=11094515621726594371172717339313367&ssq=97659516124216518921729239730450929920124&ssr=NTIuMy4yMTcuMjU0&sst=com.plumanalytics&ssu=&ssv=&ssw=&ssx=eyJ1em14IjoiN2Y5MDAwMGMxZDc2YmItMzk2MS00N2VjLTlkZGItNjdmYTVhZTY2ODdlOS0xNzI2NTI5MjM5NDUzNjMyMDAyNzU1LTE4MmRmNmFlYzc3MTJkNDQ5MzU5MjAiLCJfX3V6bWYiOiI3ZjYwMDBkNzYzNGE3Ni05ZTRkLTRjMmMtYjJhMC1mYzAzNGMyZjE1MjkxNzI2NTI5MjM5NDUzNjMyMDAyNzU1LWJmODRjMWMwZThiOWYzYTg5MzYwMTYiLCJyZCI6ImlvcC5vcmcifQ==
American Astronomical Society
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