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 O — C 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.
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L. N. Berdnikov, A. Y. Kniazev, R. Sefako, et al., Observatory 131, 315 (2011).
L. N. Berdnikov, A. Y. Kniazev, R. Sefako, et al., Observatory 131, 386 (2011).
L. N. Berdnikov, A. K. Dambis, A. Y. Kniazev, et al., Observatory 134, 206 (2014).
C. Hoffmeister, Astronomische Nachrichten 259, 37 (1936).
P. Ahnert, C. Hoffmeister, E. Rohlfs, and A. van de Voorde, Veroeff. Sternwarte Sonneberg 1, 342 (1949).
A. C. Layden, Publ. Astron. Soc. Pacific 109, 524 (1997).
M. Martignoni, J. Amer. Assoc. Variable Star Observers 32, 26 (2004).
A. W. J. Cousins, Memoirs of the Royal Astronomical Society 81, 25 (1976).
L. N. Berdnikov, O. V. Vozyakova, A. Y. Kniazev, et al., Astronomy Reports 56, 290 (2012).
D. G. Monet, S. E. Levine, B. Canzian, et al., Astron. J. 125, 984 (2003).
D. A. H. Buckley, G. P. Swart, and J. G. Meiring, Proc. of the SPIE 6267, 62670Z (2006).
D. O’Donoghue, D. A. H. Buckley, L. A. Balona, et al., Monthly Notices Royal Astron. Soc. 372, 151 (2006).
S. Barnes and P. MacQueen, Proc. of the SPIE7014, 70141H (2008).
D. G. Bramall, J. Schmoll, L. M. G. Tyas, et al., Proc. of the SPIE 8446, 84460A (2012).
L. A. Crause, R. M. Sharples, D. G. Bramall, et al., Proc. of the SPIE 9147, 91476T (2014).
S. M. Crawford, M. Still, P. Schellart, et al., Proc. of the SPIE 7737, 773725 (2010).
A. Y. Kniazev, V. V. Gvaramadze, and L. N. Berdnikov, Monthly Notices Royal Astron. Soc. 459, 3068 (2016).
P. R. T. Coelho, Monthly Notices Royal Astron. Soc. 440, 1027 (2014).
A. G. A. Brown et al. (Gaia Collab.), Astron. and Astrophys. 616, A1 (2018).
X. Luri, A. G. A. Brown, L. M. Sarro, et al., Astron. and Astrophys. 616, A9 (2018).
J. C. Zinn, M. H. Pinsonneault, D. Huber, and D. Stello, arXiv e-prints (2018).
A. G. Riess, S. Casertano, W. Yuan, et al., Astro-phys. J. 861, 126 (2018).
L. N. Yalyalieva, A. A. Chemel, E. V. Glushkova, et al., Astrophysical Bulletin 73, 335 (2018).
G. M. Green, E. F. Schlafly, D. P. Finkbeiner, et al., Astrophys. J. 783, 114 (2014).
G. M. Green, E. F. Schlafly, D. Finkbeiner, et al., Monthly Notices Royal Astron. Soc. 478, 651 (2018).
A. K. Dambis, L. N. Berdnikov, A. Y. Kniazev, et al., Monthly Notices Royal Astron. Soc. 435, 3206 (2013).
G. F. Benedict, B. E. McArthur, M. W. Feast, et al., Astron. J. 142, 187 (2011).
E. Hertzsprung, Astronomische Nachrichten 210, 17 (1919).
L. N. Berdnikov, Sov. Astron. Lett. 18, 207 (1992).
G. Pojmanski, Acta Astronomica 52, 397(2002).
B. J. Shappee, J. L. Prieto, D. Grupe, et al., Astro-phys. J. 788, 48 (2014).
C. S. Kochanek, B. J. Shappee, K. Z. Stanek, et al., Publ. Astron. Soc. Pacific 129, 104502 (2017).
J. Alfonso-Garzoón, A. Domingo, J. M. Mas-Hesse, and A. Gime´nez, Astron. and Astrophys. 548, A79 (2012).
P. R. Wozniak, W. T. Vestrand, C. W. Akerlof, et al., Astron. J. 127, 2436 (2004).
The AAVSO International Database (https://doi.org/www.aavso.org) (2018).
E. G. Schmidt and A. Seth, Astron. J. 112, 2769 (1996).
J. F. Le Borgne, A. Klotz, and M. Boer, Inform. Bull. Variable Stars, No. 5767 (2007).
J. F. Le Borgne, A. Klotz, and M. Boer, Inform. Bull. Variable Stars, No. 5790 (2007).
J. F. Le Borgne, A. Klotz, and M. Boer, Inform. Bull. Variable Stars, No. 5877 (2009).
J. F. Le Borgne, A. Klotz, and M. Boer, Inform. Bull. Variable Stars, No. 5895 (2009).
J. F. Le Borgne, A. Klotz, and M. Boer, Inform. Bull. Variable Stars, No. 6009 (2012).
J. F. Le Borgne, A. Klotz, and M. Boer, Inform. Bull. Variable Stars, No. 6043 (2013).
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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Russian Text © The Author(s), 2019, published in Astrofizicheskii Byulleten’, 2019, Vol. 74, No. 2, pp. 196–208.
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Berdnikov, L.N., Kniazev, A.Y., Dambis, A.K. et al. CCD Observations and Period Change of the Type ab RR Lyrae Star DV Mon. Astrophys. Bull. 74, 183–195 (2019). https://doi.org/10.1134/S199034131902007X
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DOI: https://doi.org/10.1134/S199034131902007X