干旱区生态环境知识资源中心(Arid): The Close Binary Fraction of Solar-type Stars Is Strongly Anticorrelated with Metallicity

Arid

DOI	10.3847/1538-4357/ab0d88
	The Close Binary Fraction of Solar-type Stars Is Strongly Anticorrelated with Metallicity
	Moe, Maxwell 1; Kratter, Kaitlin M.1; Badenes, Carles 2,3
通讯作者	Moe, Maxwell
来源期刊	ASTROPHYSICAL JOURNAL
ISSN	0004-637X
EISSN	1538-4357
出版年	2019
卷号	875 期号:1
英文摘要	There is now strong evidence that the close binary fraction (P < 10(4) days; a < 10 au) of solar-type stars (M-1 approximate to 0.6-1.5 M-circle dot) decreases significantly with metallicity. Although early surveys showed that the observed spectroscopic binary (SB) fractions in the galactic disk and halo are similar (e.g., Carney-Latham sample), these studies did not correct for incompleteness. In this study, we examine five different surveys and thoroughly account for their underlying selection biases to measure the intrinsic occurrence rate of close solar-type binaries. We reanalyze (1) a volume-limited sample of solar-type stars, (2) the Carney-Latham SB survey of high proper motion stars, (3) various SB samples of metal-poor giants, (4) the APOGEE survey of radial velocity (RV) variables, and (5) eclipsing binaries (EBs) discovered by Kepler. The observed APOGEE RV variability fraction and Kepler EB fraction both decrease by a factor of approximate to 4 across -1.0 < [Fe/H] < 0.5 at the 22 sigma and 9 sigma confidence levels, respectively. After correcting for incompleteness, all five samples/methods exhibit a quantitatively consistent anticorrelation between the intrinsic close binary fraction (a < 10 au) and metallicity: F-c(lose) = 53% +/- 12%, 40% +/- 6%, 24% +/- 4%, and 10% +/- 3% at [Fe/H] = -3.0, -1.0, -0.2 (mean field metallicity), and +0.5, respectively. We present simple fragmentation models that explain why the close binary fraction of solar-type stars strongly decreases with metallicity while the wide binary fraction, close binary fraction of OB stars, and initial mass function are all relatively constant across -1.5 less than or similar to [Fe/H] < 0.5. The majority of solar-type stars with [Fe/H] less than or similar to -1.0 will interact with a stellar companion, which has profound implications for binary evolution in old and metal-poor environments such as the galactic halo, bulge, thick disk, globular clusters, dwarf galaxies, and high-redshift universe.
英文关键词	binaries: close binaries: eclipsing binaries: spectroscopic stars: abundances stars: formation stars: solar-type
类型	Article
语种	英语
国家	USA
开放获取类型	Green Published, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000464984900015
WOS关键词	INITIAL MASS FUNCTION ; PROPER-MOTION STARS ; REVISED STELLAR PROPERTIES ; LARGE-MAGELLANIC-CLOUD ; BROWN DWARF DESERT ; MILKY-WAY ; GRAVITATIONAL-INSTABILITY ; STATISTICAL PROPERTIES ; FORMATION MECHANISM ; ORBITAL SOLUTIONS
WOS类目	Astronomy & Astrophysics
WOS研究方向	Astronomy & Astrophysics
来源机构	University of Arizona
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/214435
作者单位	1.Univ Arizona, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85721 USA; 2.Univ Pittsburgh, Dept Phys & Astron, Astrophys & Cosmol Ctr PITT PACC, 3941 Ohara St, Pittsburgh, PA 15260 USA; 3.Univ Pittsburgh, Pittsburgh Particle Phys, Astrophys & Cosmol Ctr PITT PACC, 3941 Ohara St, Pittsburgh, PA 15260 USA
推荐引用方式 GB/T 7714	Moe, Maxwell,Kratter, Kaitlin M.,Badenes, Carles. The Close Binary Fraction of Solar-type Stars Is Strongly Anticorrelated with Metallicity[J]. University of Arizona,2019,875(1).
APA	Moe, Maxwell,Kratter, Kaitlin M.,&Badenes, Carles.(2019).The Close Binary Fraction of Solar-type Stars Is Strongly Anticorrelated with Metallicity.ASTROPHYSICAL JOURNAL,875(1).
MLA	Moe, Maxwell,et al."The Close Binary Fraction of Solar-type Stars Is Strongly Anticorrelated with Metallicity".ASTROPHYSICAL JOURNAL 875.1(2019).