White dwarf-main sequence binaries identified within SDSS DR7 and UKIDSS DR5

	White dwarf-main sequence binaries identified within SDSS DR7 and UKIDSS DR5
	Liu C(刘成)1,2,3 ; Li LF(李立芳)1,3 ; Zhang FH(张奉辉)1,3 ; Zhang Y(张余)1,2,3 ; Jiang DK(姜登凯)1,3 ; Liu, JZ4
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2012-08
卷号	424 期号:3 页码:1841-1851
关键词	binaries: close binaries: spectroscopic stars: fundamental parameters white dwarfs
ISSN号	0035-8711
通讯作者	Liu, C (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	We develop optical and near-infrared colour-selection criteria based on the model colours of binaries consisting of a white dwarf and a main-sequence star. Using our colour-selection algorithm, we present a catalogue of 523 white dwarfmain sequence (WDMS) binaries from the spectroscopic Sloan Digital Sky Survey Data Release 7 (SDSS DR7), most of them previously identified. Among them, we identify 86 objects as new WDMS binaries. 95 WDMS candidates are also found from the photometric SDSS DR7, cross-matched with the United Kingdom Infrared Telescope (UKIRT) Infrared Sky Survey Data Release 5 (UKIDSS DR5). Based on a chi 2 minimization technique, we derive independent stellar parameters such as the effective temperatures, surface gravities, masses and distances of the white dwarfs and secondary stars and the metallicities of the secondaries. Meanwhile, we determine the cooling age via interpolation through evolutionary models for the effective temperature and surface gravity of each DA white dwarf. Distributions of these stellar parameters have been used to study both the general properties and the completeness of WDMS binaries. A comparison between the distances measured to the white dwarfs and the secondary stars shows a clear trend towards higher distances for the white dwarf component. It is found that the mean cooling age of the WDMS sample is (t) over bar cool similar to 4.2x108?yr and our sample contains at least 11?per cent old systems, which were formed about 1.0 x 109?yr ago. The new and updated WDMS binaries will improve the completeness of the catalogue of WDMS binaries.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	DIGITAL-SKY-SURVEY ; COMMON-ENVELOPE BINARIES ; SURVEY DATA RELEASE-4 ; CATACLYSMIC VARIABLES ; MAGNETIC BRAKING ; SPACE DENSITY ; STAR BINARIES ; COLOR TRANSFORMATIONS ; CLOSE BINARIES ; PERIOD MINIMUM
收录类别	SCI
原文出处	http://mnras.oxfordjournals.org/content/424/3/1841
语种	英语
WOS记录号	WOS:000307018300019
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4525]
专题	云南天文台_大样本恒星演化研究组云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.National Astronomical Observatories, Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming 650011, China 2.Graduate University of Chinese Academy Sciences, Beijing 100039, China 3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China 4.National Astronomical Observatories/Xinjiang Observatory, Chinese Academy of Sciences, Urumqi 830011, China
推荐引用方式 GB/T 7714	Liu C,Li LF,Zhang FH,et al. White dwarf-main sequence binaries identified within SDSS DR7 and UKIDSS DR5[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,424(3):1841-1851.
APA	Liu C,Li LF,Zhang FH,Zhang Y,Jiang DK,&Liu, JZ.(2012).White dwarf-main sequence binaries identified within SDSS DR7 and UKIDSS DR5.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,424(3),1841-1851.
MLA	Liu C,et al."White dwarf-main sequence binaries identified within SDSS DR7 and UKIDSS DR5".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 424.3(2012):1841-1851.