{
  "id": "2302.01643",
  "version": "v1",
  "published": "2023-02-03T10:38:24.000Z",
  "updated": "2023-02-03T10:38:24.000Z",
  "title": "Exploring the short-term variability of Hα and H\\b{eta} emissions in a sample of M Dwarfs",
  "authors": [
    "Vipin Kumar",
    "A. S. Rajpurohit",
    "Mudit K. Srivastava"
  ],
  "comment": "5 pages, 5 figures, submitted to the proceedings of The 21th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun",
  "categories": [
    "astro-ph.SR",
    "astro-ph.EP"
  ],
  "abstract": "Activities in M dwarfs show spectroscopic variability over various time scales ranging from a few seconds to several hours. The time scales of such variability can be related to internal dynamics of M dwarfs like magnetic activity, energetic flaring events, their rotation periods, etc. The time variability in the strengths of prominent emission lines (particularly H{\\alpha} ) is mostly taken as a proxy of such dynamic behavior. In this study, we have performed the spectroscopic monitoring of 83 M dwarfs (M0-M6.5) to study the variations in H{\\alpha} and H\\b{eta} emissions on short-time scales. Low-resolution (resolution around 5.7 angstroms) spectral time series of 3-5 minutes cadence over 0.7-2.3 hours were obtained with MFOSC-P instrument on PRL 1.2m Mt. Abu telescope, covering H\\b{eta} and H{\\alpha} wavelengths. Coupled with the data available in the literature and archival photometric data from TESS and Kepler/K2 archives, various variability parameters are explored for any plausible systematics with respect to their spectral types, and rotation periods. Though about 64% of our sample shows statistically significant variability, it is not uniform across the spectral type and rotation period. H{\\alpha} activity strength (LH{\\alpha}/Lbol) is also derived and explored for such distributions.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-02-03T10:38:24.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "short-term variability",
      "rotation period",
      "time scales",
      "spectral type",
      "prominent emission lines"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}