A HIGH-VELOCITY BULGE RR LYRAE VARIABLE ON A HALO-LIKE ORBIT
文献类型：期刊论文
| 作者 | Kunder, Andrea1; Rich, R. M.2; Hawkins, K.3; Poleski, R.4,5; Storm, J.1; Johnson, C. I.6; Shen, J.7 ; Li, Z. -Y.7; Cordero, M. J.8; Nataf, D. M.9
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| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
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| 出版日期 | 2015-07-20 |
| 卷号 | 808期号:1页码:1 |
| 关键词 | Galaxy: bulge Galaxy: formation Galaxy: halo Galaxy: kinematics and dynamics stars: Population II stars: variables: RR Lyrae |
| 英文摘要 | We report on the RR Lyrae variable star, MACHO 176.18833.411, located toward the Galactic bulge and observed within the data from the ongoing Bulge RR Lyrae Radial Velocity Assay, which has the unusual radial velocity of -372 +/- 8 km s(-1) and true space velocity of -482 +/- 22 km s(-1) relative to the Galactic rest frame. Located less than 1 kpc from the Galactic center and toward a field at (l, b) = (3, -2.5), this pulsating star has properties suggesting it belongs to the bulge RR Lyrae star population, yet a velocity indicating it is abnormal, at least with respect to bulge giants and red clump stars. We show that this star is most likely a halo interloper and therefore suggest that halo contamination is not insignificant when studying metal-poor stars found within the bulge area, even for stars within 1 kpc of the Galactic center. We discuss the possibility that MACHO 176.18833.411 is on the extreme edge of the bulge RR Lyrae radial velocity distribution, and also consider a more exotic scenario in which it is a runaway star moving through the Galaxy. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | RED CLUMP STARS ; GALACTIC BULGE ; LIGHT CURVES ; BAADE WINDOW ; OGLE-III ; GALAXY ; METALLICITY ; EXTINCTION ; MAGNITUDE ; DISTANCE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000358778900012 |
| 源URL | [http://119.78.226.72/handle/331011/28215]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Leibniz Inst Astrophys Potsdam AIP, D-14482 Potsdam, Germany 2.Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA 3.Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England 4.Ohio State Univ, Dept Astron, Columbus, OH 43210 USA 5.Univ Warsaw Observ, PL-00478 Warsaw, Poland 6.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 7.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 8.Zentrum Astron, Astron Rech Inst, D-69120 Heidelberg, Germany 9.Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia 10.Univ Roma Tor Vergata, Dipartimento Fis, I-00133 Rome, Italy |
| 推荐引用方式 GB/T 7714 | Kunder, Andrea,Rich, R. M.,Hawkins, K.,et al. A HIGH-VELOCITY BULGE RR LYRAE VARIABLE ON A HALO-LIKE ORBIT[J]. ASTROPHYSICAL JOURNAL LETTERS,2015,808(1):1. |
| APA | Kunder, Andrea.,Rich, R. M..,Hawkins, K..,Poleski, R..,Storm, J..,...&Mroz, P..(2015).A HIGH-VELOCITY BULGE RR LYRAE VARIABLE ON A HALO-LIKE ORBIT.ASTROPHYSICAL JOURNAL LETTERS,808(1),1. |
| MLA | Kunder, Andrea,et al."A HIGH-VELOCITY BULGE RR LYRAE VARIABLE ON A HALO-LIKE ORBIT".ASTROPHYSICAL JOURNAL LETTERS 808.1(2015):1. |
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来源：上海天文台
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