基于SDSS-DR8及2MASS數(shù)據(jù)的疏散星團(tuán)NGC 6791的基本性質(zhì)研究
發(fā)布時(shí)間：2018-09-04 18:13
【摘要】：利用斯隆數(shù)字巡天(SDSS)第8次釋放數(shù)據(jù)(DR8)的恒星光譜數(shù)據(jù)及2MASS(Two Micro All Sky Survey)近紅外點(diǎn)源測(cè)光數(shù)據(jù)研究著名的疏散星團(tuán)NGC 6791,得到該星團(tuán)的視向速度與金屬豐度分別為V_r=-46.4±0.2 km·s~(-1)和[Fe/H]=0.32±0.11dex.利用星團(tuán)中紅團(tuán)簇巨星作為理想"標(biāo)準(zhǔn)燭光",結(jié)合2MASS近紅外點(diǎn)源測(cè)光數(shù)據(jù)計(jì)算了該星團(tuán)的絕對(duì)距離模數(shù)為(m-M)_0=13.02±0.08 mag或4.02±0.15 kpc.與其他研究者給出的結(jié)果進(jìn)行了比較,金屬豐度、視向速度及絕對(duì)距離模數(shù)都符合得比較好.主要結(jié)論有3點(diǎn):(1)NGC 6791是個(gè)極度富金屬的星團(tuán);(2)在SDSS的光譜分辨能力以內(nèi),分離出的87顆團(tuán)星之間不存在明顯的金屬豐度差異;(3)得到的距離模數(shù)對(duì)年齡、金屬豐度及塵埃消光不敏感,是一種可靠的間接測(cè)量.
[Abstract]:The star spectral data of the eighth release data (DR8) of the Sloan Digital Sky Survey (DR8) and the 2MASS (Two Micro All Sky Survey) near-infrared point-source photometry data are used to study the famous open cluster NGC 6791. The apparent velocity and metal abundance of the cluster are obtained to be V_r=-46.4 鹵0.2 km s-1 and [Fe/H] 0.32 鹵0.11dex. respectively. Using red cluster giant as ideal "standard candlelight" and 2MASS near infrared point-source photometry data, the absolute distance modulus of this cluster is (m-M) 013.02 鹵0.08 mag or 4.02 鹵0.15 kpc.. Compared with the results obtained by other researchers, metal abundance, apparent velocity and absolute distance modulus are in good agreement. The main conclusions are as follows: (1) NGC 6791 is an extremely metal-rich star cluster; (2) within the spectral resolution of SDSS, there is no significant difference in metal abundance among 87 cluster stars separated; (3) the distance modulus pair ages are obtained. Metal abundance and dust extinction are insensitive and are a reliable indirect measurement.
【作者單位】： 常州大學(xué)信息科學(xué)與工程學(xué)院;中國科學(xué)院上海天文臺(tái);
【基金】：常州大學(xué)科研啟動(dòng)經(jīng)費(fèi)項(xiàng)目(ZMF 1002121) 國家自然科學(xué)基金項(xiàng)目(11073038,10833005) 科技部973項(xiàng)目(2007CB815403)資助
【分類號(hào)】：P154.11
[Abstract]:The star spectral data of the eighth release data (DR8) of the Sloan Digital Sky Survey (DR8) and the 2MASS (Two Micro All Sky Survey) near-infrared point-source photometry data are used to study the famous open cluster NGC 6791. The apparent velocity and metal abundance of the cluster are obtained to be V_r=-46.4 鹵0.2 km s-1 and [Fe/H] 0.32 鹵0.11dex. respectively. Using red cluster giant as ideal "standard candlelight" and 2MASS near infrared point-source photometry data, the absolute distance modulus of this cluster is (m-M) 013.02 鹵0.08 mag or 4.02 鹵0.15 kpc.. Compared with the results obtained by other researchers, metal abundance, apparent velocity and absolute distance modulus are in good agreement. The main conclusions are as follows: (1) NGC 6791 is an extremely metal-rich star cluster; (2) within the spectral resolution of SDSS, there is no significant difference in metal abundance among 87 cluster stars separated; (3) the distance modulus pair ages are obtained. Metal abundance and dust extinction are insensitive and are a reliable indirect measurement.
【作者單位】： 常州大學(xué)信息科學(xué)與工程學(xué)院;中國科學(xué)院上海天文臺(tái);
【基金】：常州大學(xué)科研啟動(dòng)經(jīng)費(fèi)項(xiàng)目(ZMF 1002121) 國家自然科學(xué)基金項(xiàng)目(11073038,10833005) 科技部973項(xiàng)目(2007CB815403)資助
【分類號(hào)】：P154.11
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