High-resolution H-band Spectroscopy of Be Stars with SDSS-III/APOGEE. II. Line Profile and Radial Velocity Variability

doi:10.3847/1538-3881/aa64ce

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	High-resolution H-band Spectroscopy of Be Stars with SDSS-III/APOGEE. II. Line Profile and Radial Velocity Variability
	Chojnowski, S. Drew 2,3; Wisniewski, John P.4; Whelan, David G.6; Labadie-Bartz, Jonathan ; Fernandes, Marcelo Borges 5; Lin, Chien-Cheng 14; Majewski, Steven R.13; Stringfellow, Guy S.12; Mennickent, Ronald E.11; Roman-Lopes, Alexandre 10
刊名	ASTRONOMICAL JOURNAL
	2017-04-01
卷号	153 期号:4
关键词	Circumstellar Matter Infrared: Stars Stars:Early-type Stars: Emission-line, Be Stars: Peculiar Stars: Variables: General
ISSN号	0004-6256
DOI	10.3847/1538-3881/aa64ce
英文摘要	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.
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000397950800001
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32637]
专题	中国科学院上海天文台
通讯作者	Chojnowski, S. Drew
作者单位	1.Lehigh Univ, Dept Phys, Bldg 16, Bethlehem, PA 18015 USA 2.Apache Point Observ, POB 59, Sunspot, NM 88349 USA 3.New Mexico State Univ, POB 59, Sunspot, NM 88349 USA 4.Univ Oklahoma, Dept Phys & Astron, 440 W Brooks St, Norman, OK 73019 USA 5.Observ Nacl, Rua Gen Jose Cristino 77, BR-20921400 Sao Cristovao, RJ, Brazil 6.Austin Coll, Dept Phys, 900 N Grand Ave, Sherman, TX 75090 USA 7.Univ Utah, Dept Phys & Astron, 115 S 1400 E, Salt Lake City, UT 84112 USA 8.Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA 9.Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA 10.Univ La Serena, Dept Fis, Fac Ciencias, Cisternas 1200, La Serena, 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]. 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.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".ASTRONOMICAL JOURNAL 153.4(2017).