PHysics of Oscillating STars
Published December 11, 2018 | Version v1
Conference paper Open

K2 Observations of Galactic RRd Stars

Creators

  • 1. Nicolaus Copernicus Astronomical Center, Warsaw, Poland
  • 2. Department of Physics & Astronomy, Camosun College, Victoria, Canada
  • 3. Konkoly Observatory, MTA CSFK, Budapest, Hungary and MTA CSFK Lendület Near-Field Cosmology Research Group, Budapest, Hungary
  • 4. Institute of Astronomy, KU Leuven, Heverlee, Belgium and Physics Department, University of Antwerp, Antwerp, Belgium

Contributors

Description

We have analysed high-precision photometry of 77 double-mode RR Lyrae (RRd) stars observed by NASA’s Kepler-K2 mission during Campaigns 1-18. Among those stars, we have identified several low-period ratio variables, belonging either to a subclass of "anomalous" RRd stars (Soszyński et al., 2016) or to a separate shorter-period subclass recently identified by Prudil et al. (2017). A non-radial mode with the period ratio of Px/P1 ~ 0.615 has been detected in most RRd stars of our sample. In majority of these variables, at least one subharmonic of the non-radial frequency is also present. Our findings indicate that excitation of the non-radial mode is a common property of the RRd stars. The same non-radial pulsation is also commonly detected in the RRc stars. We show that properties of this puzzling mode are essentially the same in both groups of RR Lyrae-type pulsators.

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Additional details

References

  • Dziembowski, W. A. 2016, In High-Precision Studies of RR Lyrae Stars, Communications from the Konkoly Observatory, vol. 105, p. 23.
  • Jurcsik, J., Smitola, P., Hajdu, G., Sódor, Á., Nuspl, J., Kolenberg, K., Fűrész, G., Moór, A., Kun, E., Pál, A., Bakos, J., Kelemen, J., Kovács, T., Kriskovics, L., Sárneczky, K., Szalai, T., Szing, A., & Vida, K. 2015, ApJS, 219, 25.
  • Kurtz, D. W., Bowman, D. M., Ebo, S. J., Moskalik, P., Handberg, R., & Lund, M. N. 2016, MNRAS, 455, 1237.
  • Molnár, L., Szabó, R., Moskalik, P. A., Nemec, J. M., Guggenberger, E., Smolec, R., Poleski, R., Plachy, E., Kolenberg, K., & Kolláth, Z. 2015, MNRAS, 452, 4283.
  • Moskalik, P., Smolec, R., Kolenberg, K., Molnár, L., Kurtz, D. W., Szabó, R., Benkő, J. M., Nemec, J. M., Chadid, M., Guggenberger, E., Ngeow, C.-C., Jeon, Y.-B., Kopacki, G., & Kanbur, S. M. 2015, MNRAS, 447, 2348.
  • Nemec, J. M., Cohen, J. G., Ripepi, V., Derekas, A., Moskalik, P., Sesar, B., Chadid, M., & Bruntt, H. 2013, ApJ, 773, 181.
  • Nemec, J. M., Moskalik, P., Molnár, L., Plachy, E., Szabó, R., & Kolenberg, K. 2019, in preparation.
  • Netzel, H., Smolec, R., & Moskalik, P. 2015a, MNRAS, 447, 1173.
  • Netzel, H., Smolec, R., & Moskalik, P. 2015b, MNRAS, 453, 2022.
  • Plachy, E., Klagyivik, P., Molnár, L., & Szabó, R. 2017, In European Physical Journal Web of Conferences, vol. 160, p. 04010.
  • Plachy, E., Molnár, L., Bódi, A., Skarka, M., Juhász, Á. L., Sódor, Á., Klagyivik, P., & Szabó, R. 2018, In Revival of the Classical Pulsators: from Galactic Structure to Stellar Interior Diagnostics, Proceedings of the Polish Astronomical Society, vol. 6, p. 114.
  • Prudil, Z., Smolec, R., Skarka, M., & Netzel, H. 2017, MNRAS, 465, 4074.
  • Smolec, R., Soszyński, I., Udalski, A., Szymański, M. K., Pietrukowicz, P., Skowron, J., Kozłowski, S., Poleski, R., Skowron, D., Pietrzyński, G., Wyrzykowski, Ł., Ulaczyk, K., & Mróz, P. 2015, MNRAS, 447, 3756.
  • Smolec, R., Moskalik, P., Kałużny, J., Pych, W., Różyczka, M., & Thompson, I. B. 2017a, MNRAS, 467, 2349.
  • Smolec, R., Dziembowski, W. A., Moskalik, P., Netzel, H., Prudil, Z., Skarka, M., & Soszyński, I. 2017b, In European Physical Journal Web of Conferences, vol. 152, p. 06003.
  • Soszyński, I., Udalski, A., Szymański, M. K., Pietrukowicz, P., Mróz, P., Skowron, J., Kozłowski, S., Poleski, R., Skowron, D., Pietrzyński, G., Wyrzykowski, L., Ulaczyk, K., & Kubiak, M. 2014, Acta Astron., 64, 177.
  • Soszyński, I., Smolec, R., Dziembowski, W. A., Udalski, A., Szymański, M. K., Wyrzykowski, Ł., Ulaczyk, K., Poleski, R., Pietrukowicz, P., Kozłowski, S., Skowron, D., Skowron, J., Mróz, P., & Pawlak, M. 2016, MNRAS, 463, 1332.
  • Still, M., & Barclay, T. 2012, In Astrophysics Code Library, record 1208.004.