23219.利用batc和sdss數(shù)據(jù)研究銀河系恒星金屬豐度分布

1、中國科學(xué)院研究生院碩士學(xué)位論文利用BATC和SDSS數(shù)據(jù)研究銀河系恒星金屬豐度分布姓名：彭喜衍申請學(xué)位級別：碩士專業(yè)：天體物理指導(dǎo)教師：杜翠花201205AbstractTherearevariousgala婦esintheuniverseTheinvestigationofthefbrmationandeVolutionofgala)(iesisVeryimportantfbrthestudyofgala撕esTheirl、屯s—ti

2、gationoftheMilkyW匆isadirectwa礦ThestudyoftheGalaxymetallicitydistributionissigni丘cantThisdissertationconsistsoffburparts，includingofgeneralstructureoftheGalaxy，BATCandSDSSphotometricsystemanddatareduction，metaUicitydistri

3、butionstudieswithBATCandSDSSobservationandthefuturework21Beijing—Arizona—Tai、van—Connecticut(BATC)iIltermediate—latitude丘eldsphotometricdataareusedinthisdissertationUsing1561tersphotometricdataoftheBATCphotometricsystemc

4、ombinedwith56ltersphotometricdataoftheSDSSphotometricsystem，weadoptthespectralenergydistribution(SED)fittingmethodtoevaluatethemetallicityandstellare髓ctivetemperatureforabout40，000mainsequencestarsAccordingtothederivedph

5、otometricmetal一1icitiesofthesesamplestars，wefindthatthemetallicitydistributionshiftsfrommetalrichtometal—poorwiththeincreaseofdistaJlce丘omtheGalacticcentreThemeanmetallicityisabout一15土02dexintheouterhaloand一13士01dexinthe

6、innerhaloandsmoothlydecreasesfrom一04to一08intheintervalof05kpc)，sothereislittleornometauicitygradientinthehalo，itisconsistentwiththatthehalofbrmviacoUapseandmergersKey、7lrords：halo，thindisc，thickdisc，Galaxy：evolution，Gala