Published September 28, 2022 | Version v1
Poster Open

Study of Chemically Peculiar Stars-III: High-resolution Spectroscopy and K2 Photometry of New Variables in the Region of M44

  • 1. Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital-263002, India
  • 2. Mbarara University of Science and Technology, P.O.Box 1410, Mbarara, Uganda
  • 3. Affiliate Faculty, Physics and Astronomy Department, George Mason University, Fairfax, VA 22030, USA
  • 4. National Astronomical Research Institute of Thailand, Chiangmai 50180, Thailand
  • 5. Royal Observatory of Belgium, Ringlaan 3, B-1180 Brussels, Belgium
  • 6. Jeremiah Horrocks Institute , Univer sity of Central Lancashire, Preston PR1 2HE, UK
  • 7. CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
  • 8. Department of Physics, Kyambogo University, P.O.Box 1, Kyambogo, Uganda

Description

We aim to carry out a study on the photometric and spectroscopic variabilities of four stars monitored in the Nainital-Cape survey. We analysed the photometric variability of the target stars, HD 73135, BD +19° 2045, BD +19° 2046, and TYC 1395-855-1, using ground-based differential photometric and K2 data. Spectrophotometric and high-resolution spectroscopic data are used to determine the fundamental parameters and chemical abundances. Although all the target are found to be non-variable based on ground-based differential photometry, the analysis of high-precision K2 photometric time-series reveals that HD 73135, BD +19° 2045, and BD +19° 2046 are variable. We do not detect photometric variability in TYC 1395-855-1. Our analyses show that the three stars, HD 73135, BD +19° 2045, BD +19° 2046, which are non-variable based on ground- based observations exhibit rotational variability in Kepler K2 data while TYC 1395-855-1 remains constant in both data sets. Based on the chemical abundance analysis, HD 73135 is an Am star, while BD +19° 2045 is non-Am.

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