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

S. Drew Chojnowski, John P. Wisniewski, David G. Whelan, Jonathan Labadie-Bartz, Marcelo Borges Fernandes, Chien Cheng Lin, Steven R. Majewski, Guy S. Stringfellow, Ronald E. Mennickent, Alexandre Roman-Lopes, Baitian Tang, Fred R. Hearty, Jon A. Holtzman, Joshua Pepper, Gail Zasowski

Research output: Contribution to journalArticle

9 Citations (Scopus)

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.

Original languageEnglish (US)
Article number174
JournalAstronomical Journal
Volume153
Issue number4
DOIs
StatePublished - Apr 2017

Fingerprint

galactic evolution
radial velocity
velocity distribution
spectroscopy
stars
high resolution
experiment
blue stars
binary stars
spectral bands
time measurement
timescale

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Chojnowski, S. D., Wisniewski, J. P., Whelan, D. G., Labadie-Bartz, J., Fernandes, M. B., Lin, C. C., ... Zasowski, G. (2017). High-resolution H-band Spectroscopy of Be Stars with SDSS-III/APOGEE. II. Line Profile and Radial Velocity Variability. Astronomical Journal, 153(4), [174]. https://doi.org/10.3847/1538-3881/aa64ce
Chojnowski, S. Drew ; Wisniewski, John P. ; Whelan, David G. ; Labadie-Bartz, Jonathan ; Fernandes, Marcelo Borges ; Lin, Chien Cheng ; Majewski, Steven R. ; Stringfellow, Guy S. ; Mennickent, Ronald E. ; Roman-Lopes, Alexandre ; Tang, Baitian ; Hearty, Fred R. ; Holtzman, Jon A. ; Pepper, Joshua ; Zasowski, Gail. / High-resolution H-band Spectroscopy of Be Stars with SDSS-III/APOGEE. II. Line Profile and Radial Velocity Variability. In: Astronomical Journal. 2017 ; Vol. 153, No. 4.
@article{ab8cfa269ef64346a7c64a54674d7335,
title = "High-resolution H-band Spectroscopy of Be Stars with SDSS-III/APOGEE. II. Line Profile and Radial Velocity Variability",
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.",
author = "Chojnowski, {S. Drew} and Wisniewski, {John P.} and Whelan, {David G.} and Jonathan Labadie-Bartz and Fernandes, {Marcelo Borges} and Lin, {Chien Cheng} and Majewski, {Steven R.} and Stringfellow, {Guy S.} and Mennickent, {Ronald E.} and Alexandre Roman-Lopes and Baitian Tang and Hearty, {Fred R.} and Holtzman, {Jon A.} and Joshua Pepper and Gail Zasowski",
year = "2017",
month = "4",
doi = "10.3847/1538-3881/aa64ce",
language = "English (US)",
volume = "153",
journal = "Astronomical Journal",
issn = "0004-6256",
publisher = "IOP Publishing Ltd.",
number = "4",

}

Chojnowski, SD, Wisniewski, JP, Whelan, DG, Labadie-Bartz, J, Fernandes, MB, Lin, CC, Majewski, SR, Stringfellow, GS, Mennickent, RE, Roman-Lopes, A, Tang, B, Hearty, FR, Holtzman, JA, Pepper, J & Zasowski, G 2017, 'High-resolution H-band Spectroscopy of Be Stars with SDSS-III/APOGEE. II. Line Profile and Radial Velocity Variability', Astronomical Journal, vol. 153, no. 4, 174. https://doi.org/10.3847/1538-3881/aa64ce

High-resolution H-band Spectroscopy of Be Stars with SDSS-III/APOGEE. II. Line Profile and Radial Velocity Variability. / Chojnowski, S. Drew; Wisniewski, John P.; Whelan, David G.; Labadie-Bartz, Jonathan; Fernandes, Marcelo Borges; Lin, Chien Cheng; Majewski, Steven R.; Stringfellow, Guy S.; Mennickent, Ronald E.; Roman-Lopes, Alexandre; Tang, Baitian; Hearty, Fred R.; Holtzman, Jon A.; Pepper, Joshua; Zasowski, Gail.

In: Astronomical Journal, Vol. 153, No. 4, 174, 04.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - High-resolution H-band Spectroscopy of Be Stars with SDSS-III/APOGEE. II. Line Profile and Radial Velocity Variability

AU - Chojnowski, S. Drew

AU - Wisniewski, John P.

AU - Whelan, David G.

AU - Labadie-Bartz, Jonathan

AU - Fernandes, Marcelo Borges

AU - Lin, Chien Cheng

AU - Majewski, Steven R.

AU - Stringfellow, Guy S.

AU - Mennickent, Ronald E.

AU - Roman-Lopes, Alexandre

AU - Tang, Baitian

AU - Hearty, Fred R.

AU - Holtzman, Jon A.

AU - Pepper, Joshua

AU - Zasowski, Gail

PY - 2017/4

Y1 - 2017/4

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85017363448&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85017363448&partnerID=8YFLogxK

U2 - 10.3847/1538-3881/aa64ce

DO - 10.3847/1538-3881/aa64ce

M3 - Article

AN - SCOPUS:85017363448

VL - 153

JO - Astronomical Journal

JF - Astronomical Journal

SN - 0004-6256

IS - 4

M1 - 174

ER -