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Astrophysical Bulletin

, Volume 74, Issue 2, pp 183–195 | Cite as

CCD Observations and Period Change of the Type ab RR Lyrae Star DV Mon

  • L. N. BerdnikovEmail author
  • A. Yu. Kniazev
  • A. K. Dambis
  • V. V. Kravtsov
  • E. N. Pastukhova
  • I. Y. Katkov
Article
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Abstract

We took a total of 635 B-, V-, and Ic-band CCD frames for the RRab Lyr type variable DVMon, which has a close bright visual companion with a separation of about 1.9′. Observations were made with the 76-cm telescope of the South African Astronomical Observatory (SAAO, South Africa) using SBIG CCD ST-10XME. For the first time, we obtained reliable separate PSF-photometry of both stars and determined their coordinates. We used all available data to construct the OC diagram spanning a 110-year long time interval, which allowed us to reveal at least three sudden changes of the pulsation period around JD 2438000, 2453500, and 2456500. Our high resolution echelle spectra with the Southern African Large Telescope (SALT) showed that DV Mon belongs to type ab RR Lyrae variables of the Galactic thick disk.

Keywords

stars variables RR Lyrae 

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Notes

Acknowledgements

We acknowledge with thanks the data from the NSVS, ASAS-3, ASAS-SN and INTEGRAL-OMC projects as well as from the AAVSO International Database contributed by observers worldwide. Authors acknowledge SALT-astronomer Dr. Danièl N. Groenewald for her assistance with HRS observations.

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Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  • L. N. Berdnikov
    • 1
    Email author
  • A. Yu. Kniazev
    • 2
    • 3
    • 1
  • A. K. Dambis
    • 1
    • 4
  • V. V. Kravtsov
    • 1
  • E. N. Pastukhova
    • 5
  • I. Y. Katkov
    • 1
    • 6
  1. 1.Sternberg Astronomical InstituteMoscow State UniversityMoscowRussia
  2. 2.South African Astronomical ObservatoryCape TownSouth Africa
  3. 3.Southern African Large TelescopeCape TownSouth Africa
  4. 4.Faculty of PhysicsMoscow State UniversityMoscowRussia
  5. 5.Institute of AstronomyRussian Academy of SciencesMoscowRussia
  6. 6.New York University Abu DhabiAbu DhabiUAE

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