本文選題：郭守敬望遠(yuǎn)鏡 + 金屬豐度分布函數(shù)��； 參考：《上海師范大學(xué)》2015年碩士論文

【摘要】：研究銀河系矮星的金屬豐度分布函數(shù)(MDF)對(duì)理解銀河系化學(xué)演化和動(dòng)力學(xué)演化有重要意義。像F、G、K型矮星這樣的冷星的年齡,被認(rèn)為大于或者相當(dāng)于銀盤(pán)的年齡。所以,曾經(jīng)誕生于銀河系中的這些恒星都還沒(méi)有離開(kāi)主序階段。通過(guò)測(cè)量和研究這些冷星的金屬豐度分布函數(shù),可以為盤(pán)星的形成歷史及其演化提供嚴(yán)格的約束。當(dāng)然,比G矮星更冷的恒星,比如K矮星或者M(jìn)矮星有比G矮星更長(zhǎng)的壽命。然而,鑒于這些恒星光度較小,基于K矮星或M矮星的樣本可能僅僅在一個(gè)小的區(qū)域內(nèi),同時(shí),還會(huì)有更多的偏差,更難得到一個(gè)無(wú)偏的、完備的樣本。大天區(qū)面積多目標(biāo)光纖光譜望遠(yuǎn)鏡(LAMOST,又稱為郭守敬望遠(yuǎn)鏡)可以在一次曝光中同時(shí)得到4000個(gè)目標(biāo)天體的低分辨率光譜。郭守敬望遠(yuǎn)鏡具有20平方度的視場(chǎng),同時(shí)具有3.6-4.9m的有效通光半徑。此巡天觀測(cè)有兩個(gè)觀測(cè)計(jì)劃:河外星系巡天(LEGAS)和旨在研究銀河系結(jié)構(gòu)的銀河系巡天(LEGUE)兩部分。我們的研究目標(biāo)是基于郭守敬望遠(yuǎn)鏡銀河系巡天研究太陽(yáng)附近G矮星的金屬豐度分布函數(shù)。我們從LAMOST DR2中選出太陽(yáng)附近的282,217顆G矮星,并研究其金屬豐度分布函數(shù)。然后,將我們得到的基于LAMOST銀河系巡天的G矮星的金屬豐度分布函數(shù)與源自日內(nèi)瓦-哥本哈根(GCS)太陽(yáng)附近的研究(一個(gè)星等完備,運(yùn)動(dòng)學(xué)上無(wú)偏的近鄰的16,682顆F和G矮星樣本)得到的測(cè)光較好的irfm樣本作比較。我們發(fā)現(xiàn),與GCS樣本相比,我們的樣本有更高比例的貧金屬星。最后,我們認(rèn)為,當(dāng)我們基于LAMOST光譜巡天研究太陽(yáng)附近G矮星的金屬豐度分布函數(shù)時(shí),可能存在選擇效應(yīng)。
[Abstract]:The study of the metal abundance distribution function (MDF) of the Milky way Dwarfs is of great significance in understanding the chemical and kinetic evolution of the Milky way. Cold stars such as the FGG K dwarf are believed to be older than or equal to the silver disk. So the stars that were born in the Milky way haven't left the main sequence yet. By measuring and studying the metal abundance distribution function of these cold stars, it is possible to provide strict constraints for the formation history and evolution of these cold stars. Of course, stars colder than G dwarfs, such as K dwarfs or M dwarfs, have longer lifetimes than G dwarfs. However, given the small luminosity of these stars, samples based on K or M dwarfs may only be in a small region, and at the same time, there will be more deviations and it will be more difficult to obtain an unbiased, complete sample. LAMOST (also known as Guo Shoujing Telescope) can obtain the low resolution spectra of 4,000 target objects in a single exposure at the same time. The Kuo Shoujing telescope has a field of view of 20 square degrees and an effective radius of 3.6-4.9 m. There are two observational plans for this survey: the Extragalactic Survey (LEGASS) and the Galactic Profiler (LEGUE) to study the structure of the Milky way. Our aim is to study the metal abundance distribution function of G dwarf stars near the Sun based on the Galactic Survey of the Kuo Shoujing Telescope. We select 282217 G dwarfs from LAMOST DR2 and study their metal abundance distribution function. Then, the metal abundance distribution function of the G dwarf star based on the LAMOST Galaxy Survey and the study near the Sun from the Geneva-Copenhagen GCSs (a magnitude complete) are obtained. 16682 samples of F and G dwarfs with unbiased kinematics are compared with irfm samples with better photometry. We found that our sample has a higher proportion of poor metal stars than the GCS sample. Finally, we consider that there may be a selective effect when we study the metal abundance distribution function of G dwarf stars near the sun based on the LAMOST spectral survey.
【學(xué)位授予單位】：上海師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P148

【參考文獻(xiàn)】

相關(guān)期刊論文 前9條

1 侯金良,常瑞香,傅承啟;太陽(yáng)附近F和G矮星的金屬含量統(tǒng)計(jì)[J];中國(guó)科學(xué)院上海天文臺(tái)年刊;1998年00期

2 常瑞香,侯金良,傅承啟;太陽(yáng)附近G矮星金屬含量分布和化學(xué)演化[J];天體物理學(xué)報(bào);1998年04期

3 趙君亮;;銀河系厚盤(pán)恒星的年齡-金屬度關(guān)系[J];天文學(xué)進(jìn)展;2005年04期

4 趙君亮;;銀河系內(nèi)區(qū)的棒結(jié)構(gòu)[J];天文學(xué)進(jìn)展;2009年02期

5 Heidi Jo Newberg;Jeffrey L. Carlin;Norbert Christlieb;Hsu-Tai Lee;;The site conditions of the Guo Shou Jing Telescope[J];Research in Astronomy and Astrophysics;2012年07期

6 ;The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST)[J];Research in Astronomy and Astrophysics;2012年09期

7 鐘靖;侯金良;沈世銀;;銀河系光學(xué)和紅外巡天進(jìn)展[J];天文學(xué)進(jìn)展;2013年04期

8 Heidi Jo Newberg;Jeffrey L. Carlin;Timothy C. Beers;Norbert Christlieb;Carl J. Grillmair;Puragra Guhathakurta;Hsu-Tai Lee;S忮bastien L忮pine;J. A. Sellwood;Brian Yanny;;LAMOST Experiment for Galactic Understanding and Exploration (LEGUE)——The survey's science plan[J];Research in Astronomy and Astrophysics;2012年07期

9 趙君亮;;銀河系的形成和演化[J];物理;2007年11期

相關(guān)博士學(xué)位論文 前1條

1 常瑞香;銀盤(pán)化學(xué)演化及恒星形成歷史[D];中國(guó)科學(xué)院上海天文臺(tái);1999年

相關(guān)碩士學(xué)位論文 前1條

1 尹君;M31的恒星形成歷史及與銀河系的比較[D];河北師范大學(xué);2006年

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