Time-monitoring observations of Brγ emission from young stars

Joshua A Eisner, George H. Rieke, Marcia J Rieke, K. M. Flaherty, J. M. Stone, T. J. Arnold, S. R. Cortes, E. Cox, C. Hawkins, A. Cole, S. Zajac, A. L. Rudolph

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Abstract

We present multiple epochs of near-infrared spectroscopy for a sample of 25 young stars, including T Tauri, Herbig Ae/Be, and FU Ori objects. Using the FSPEC instrument on the Bok 90-inch telescope, we obtained K-band spectra of the Brγ transition of hydrogen, with a resolution of ≈3500. Epochs were taken over a span of >1 yr, sampling time-spacings of roughly 1 d, 1 month, and 1 yr. The majority of our targets show Brγ emission, and in some cases these are the first published detections. Time variability is seen in approximately half of the targets showing Brγ emission. We compare the observed variability with expectations for rotationally modulated accretion on to the central stars and time-variable continuum emission or extinction from matter in the inner disc. Our observations are not entirely consistent with models of rotationally modulated magnetospheric accretion. Further monitoring, over a larger number of epochs, will facilitate more quantitative constraints on variability time-scales and amplitudes, and a more conclusive comparison with theoretical models.

Original languageEnglish (US)
Pages (from-to)202-217
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume447
Issue number1
DOIs
StatePublished - Nov 20 2014

Fingerprint

stars
time measurement
monitoring
accretion
infrared spectroscopy
T Tauri stars
near infrared
spacing
extremely high frequencies
extinction
hydrogen
timescale
sampling
telescopes
continuums
young
detection
comparison

Keywords

  • Accretion
  • Accretion discs
  • Circumstellar matter
  • Herbig ae/be
  • Infrared: stars
  • Stars: variables: t tauri
  • Techniques: spectroscopic

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Time-monitoring observations of Brγ emission from young stars. / Eisner, Joshua A; Rieke, George H.; Rieke, Marcia J; Flaherty, K. M.; Stone, J. M.; Arnold, T. J.; Cortes, S. R.; Cox, E.; Hawkins, C.; Cole, A.; Zajac, S.; Rudolph, A. L.

In: Monthly Notices of the Royal Astronomical Society, Vol. 447, No. 1, 20.11.2014, p. 202-217.

Research output: Contribution to journalArticle

Eisner, JA, Rieke, GH, Rieke, MJ, Flaherty, KM, Stone, JM, Arnold, TJ, Cortes, SR, Cox, E, Hawkins, C, Cole, A, Zajac, S & Rudolph, AL 2014, 'Time-monitoring observations of Brγ emission from young stars', Monthly Notices of the Royal Astronomical Society, vol. 447, no. 1, pp. 202-217. https://doi.org/10.1093/mnras/stu2441
Eisner, Joshua A ; Rieke, George H. ; Rieke, Marcia J ; Flaherty, K. M. ; Stone, J. M. ; Arnold, T. J. ; Cortes, S. R. ; Cox, E. ; Hawkins, C. ; Cole, A. ; Zajac, S. ; Rudolph, A. L. / Time-monitoring observations of Brγ emission from young stars. In: Monthly Notices of the Royal Astronomical Society. 2014 ; Vol. 447, No. 1. pp. 202-217.
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