{
  "id": "1411.5370",
  "version": "v1",
  "published": "2014-11-19T21:00:54.000Z",
  "updated": "2014-11-19T21:00:54.000Z",
  "title": "Time-monitoring Observations of Br$γ$ Emission from Young Stars",
  "authors": [
    "J. A. Eisner",
    "G. H. Rieke",
    "M. J. Rieke",
    "K. M. Flaherty",
    "Jordan M. Stone",
    "T. J. Arnold",
    "S. R. Cortes",
    "E. Cox",
    "C. Hawkins",
    "A. Cole",
    "S. Zajac",
    "A. L. Rudolph"
  ],
  "comment": "16 pages in emulateapj format. Accepted for publication in MNRAS",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We present multiple epochs of near-IR 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 BrGamma transition of hydrogen, with a resolution of ~3500. Epochs were taken over a span of >1 year, sampling time-spacings of roughly one day, one month, and one year. The majority of our targets show BrGamma emission, and in some cases these are the first published detections. Time-variability is seen in approximately half of the targets showing BrGamma emission. We compare the observed variability with expectations for rotationally-modulated accretion onto the central stars and time-variable continuum emission or extinction from matter in the inner disk. 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 timescales and amplitudes, and a more conclusive comparison with theoretical models.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-11-19T21:00:54.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "young stars",
      "time-monitoring observations",
      "fu ori objects",
      "targets showing brgamma emission",
      "near-ir spectroscopy"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1093/mnras/stu2441",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2015,
      "month": "Feb",
      "volume": 447,
      "number": 1,
      "pages": 202
    },
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2015MNRAS.447..202E"
    }
  }
}