High-resolution H-band Spectroscopy of Be Stars with SDSS-III/APOGEE. II. Line Profile and Radial Velocity Variability
文献类型：期刊论文
| 作者 | Chojnowski,S. Drew2; Wisniewski,John P.3; Whelan,David G.4; Labadie-Bartz,Jonathan5; Fernandes,Marcelo Borges6; Lin,Chien-Cheng7; Majewski,Steven R.8; Stringfellow,Guy S.9; Mennickent,Ronald E.10; Roman-Lopes,Alexandre11 |
| 刊名 | The Astronomical Journal
 |
| 出版日期 | 2017-03-24 |
| 卷号 | 153期号:4 |
| ISSN号 | 0004-6256 |
| 关键词 | circumstellar matter infrared: stars stars: early-type stars: emission-line, Be stars: peculiar stars: variables: general |
| DOI | 10.3847/1538-3881/aa64ce |
| 英文摘要 | Abstract We report on the H-band spectral variability of classical Be stars observed over the course of the Apache Point Galactic Evolution Experiment (APOGEE), one of four subsurveys comprising SDSS-III. As described in the first paper of this series, the APOGEE B-type emission-line (ABE) star sample was culled from the large number of blue stars observed as telluric standards during APOGEE observations. In this paper, we explore the multi-epoch ABE sample, consisting of 1100 spectra for 213 stars. These “snapshots” of the circumstellar disk activity have revealed a wealth of temporal variability including, but not limited to, gradual disappearance of the line emission and vice versa over both short and long timescales. Other forms of variability include variation in emission strength, emission peak intensity ratios, and emission peak separations. We also analyze radial velocities (RVs) of the emission lines for a subsample of 162 stars with sufficiently strong features, and we discuss on a case-by-case basis whether the RV variability exhibited by some stars is caused by binary motion versus dynamical processes in the circumstellar disks. Ten systems are identified as convincing candidates for binary Be stars with as of yet undetected companions. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-6256-153-4-AA64CE |
| 源URL | [http://119.78.226.72/handle/331011/32133]  |
| 专题 | 中国科学院上海天文台 |
| 作者单位 | 1.Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD, 21218, USA 2.Apache Point Observatory and New Mexico State University, P.O. Box 59, Sunspot, NM, 88349-0059, USA 3.Department of Physics & Astronomy, The University of Oklahoma, 440 W. Brooks Street, Norman, OK 73019, USA 4.Department of Physics, Austin College, 900 N. Grand Avenue, Sherman, TX 75090, USA 5.Department of Physics, Lehigh University, Bethlehem, PA 18015, USA 6.Observatório Nacional, Rua General José Cristino 77, 20921-400, S?o Cristov?o, Rio de Janeiro, Brazil 7.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road Shanghai 200030, China 8.Department of Astronomy, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904-4325, USA 9.Center for Astrophysics and Space Astronomy, Department of Astrophysical and Planetary Sciences, University of Colorado, 389 UCB, Boulder, Colorado 80309-0389, USA 10.Departamento de Astronomía, Universidad de Concepción, Concepción, Chile |
| 推荐引用方式 GB/T 7714 | Chojnowski,S. Drew,Wisniewski,John P.,Whelan,David G.,et al. High-resolution H-band Spectroscopy of Be Stars with SDSS-III/APOGEE. II. Line Profile and Radial Velocity Variability[J]. The Astronomical Journal,2017,153(4). |
| APA | Chojnowski,S. Drew.,Wisniewski,John P..,Whelan,David G..,Labadie-Bartz,Jonathan.,Fernandes,Marcelo Borges.,...&Zasowski,Gail.(2017).High-resolution H-band Spectroscopy of Be Stars with SDSS-III/APOGEE. II. Line Profile and Radial Velocity Variability.The Astronomical Journal,153(4). |
| MLA | Chojnowski,S. Drew,et al."High-resolution H-band Spectroscopy of Be Stars with SDSS-III/APOGEE. II. Line Profile and Radial Velocity Variability".The Astronomical Journal 153.4(2017). |
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来源：上海天文台
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