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- W3101781068 endingPage "140" @default.
- W3101781068 startingPage "140" @default.
- W3101781068 abstract "Based on a carefully constructed sample of dwarf stars, a new optical-near infrared photometric calibration to estimate the metallicity of late-type K and early-to-mid-type M dwarfs is presented. The calibration sample has two parts; the first part includes 18 M dwarfs with metallicities determined by high-resolution spectroscopy and the second part contains 49 dwarfs with metallicities obtained through moderate-resolution spectra. By applying this calibration to a large sample of around 1.3 million M dwarfs from the Sloan Digital Sky Survey and the Two-Micron All Sky Survey, the metallicity distribution of this sample is determined and compared with those of previous studies. Using photometric parallaxes, the Galactic heights of M dwarfs in the large sample are also estimated. Our results show that stars farther from the Galactic plane, on average, have lower metallicity, which can be attributed to the age-metallicity relation. A scarcity of metal-poor dwarf stars in the metallicity distribution relative to the Simple Closed Box Model indicates the existence of the M dwarf problem, similar to the previously known G and K dwarf problems. Several more complicated Galactic chemical evolution models which have been proposed to resolve the G and K dwarf problems are tested and it is shown that these models could, to some extent, mitigate the M dwarf problem as well." @default.
- W3101781068 created "2020-11-23" @default.
- W3101781068 creator A5006605151 @default.
- W3101781068 creator A5015926403 @default.
- W3101781068 creator A5087759308 @default.
- W3101781068 date "2015-03-26" @default.
- W3101781068 modified "2023-09-24" @default.
- W3101781068 title "OPTICAL–NEAR-INFRARED PHOTOMETRIC CALIBRATION OF M DWARF METALLICITY AND ITS APPLICATION" @default.
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- W3101781068 doi "https://doi.org/10.1088/0004-6256/149/4/140" @default.
- W3101781068 hasPublicationYear "2015" @default.
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