Explanipedia

Double-Mode RR Lyrae Stars Observed by K2: Analysis of High-Precision Kepler Photometry Open

J. M. Nemec, Amanda F. Linnell Nemec, P. Moskalik, L. Molnár, E. Plachy , et al. · 2024

The results of a Fourier analysis of high-precision Kepler photometry of 75 double-mode RR~Lyrae (RRd) stars observed during NASA's K2 Mission (2014-18) are presented. Seventy-two of the stars are `classical' RRd (cRRd) stars lying along a…

Double-mode RR Lyrae stars observed by K2: analysis of high-precision Kepler photometry Open

J. M. Nemec, Amanda F Linnell Nemec, P. Moskalik, L. Molnár, E. Plachy , et al. · 2024

The results of a Fourier analysis of high-precision Kepler photometry of 75 double-mode RR Lyrae (RRd) stars observed during NASA’s K2 Mission (2014-18) are presented. Seventy-two of the stars are ‘classical’ RRd (cRRd) stars lying along a…

First Results on RR Lyrae Stars with the TESS Space Telescope: Untangling the Connections between Mode Content, Colors, and Distances Open

L. Molnár, Attila Bódi, András Pál, Anupam Bhardwaj, Franz-Josef Hambsch , et al. · 2021

The Transiting Exoplanet Survey Satellite (TESS) space telescope is collecting continuous, high-precision optical photometry of stars throughout the sky, including thousands of RR Lyrae stars. In this paper, we present results for an initi…

The first view of δ Scuti and γ Doradus stars with the TESS mission Open

V. Antoci, M. S. Cunha, D. M. Bowman, Simon J. Murphy, D. W. Kurtz , et al. · 2021

© 2019 The Author(s) We present the first asteroseismic results for δ Scuti and γ Doradus stars observed in Sectors 1 and 2 of the TESS mission. We utilize the 2-min cadence TESS data for a sample of 117 stars to classify their behaviour r…

Four ‘Peculiar’ RRd stars observed by K2 Open

J. M. Nemec, P. Moskalik · 2021

Four stars pulsating simultaneously with a dominant period PD ∈ (0.28, 0.39) d and an additional period PA ∈ (0.20, 0.27) d have been identified from among the more than 3000 RR Lyrae stars observed by the Kepler space telescope during NAS…

Rotation and pulsation in Ap stars: first light results from TESS sectors 1 and 2 Open

M. S. Cunha, V. Antoci, Daniel L. Holdsworth, D. W. Kurtz, L. A. Balona , et al. · 2019

We present the first results from the Transiting Exoplanet Survey Satellite (TESS) on the rotational and pulsational variability of magnetic chemically peculiar A-type stars. We analyse TESS 2-min cadence data from sectors 1 and 2 on a sam…

K2 Observations of Galactic RRd Stars Open

P. Moskalik, J. M. Nemec, L. Molnár, E. Plachy, R. Szabó , et al. · 2018

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 s…

K2 Observations of Double-Mode RR Lyrae Stars Open

P. Moskalik, J. M. Nemec, L. Molnár, E. Plachy, R. Szabó , et al. · 2018

Little Bear's Pulsating Stars: Variable Star Census of dSph UMi Galaxy Open

Karen Kinemuchi, Elizabeth Jeffery, Charles A. Kuehn, Kathleen Grabowski, J. M. Nemec · 2017

Recent observations and a photometric search for variable stars in the Ursa Minor dwarf spheroidal galaxy (UMi dSph) are presented. Our observations were taken at Apache Point Observatory in 2014 and 2016 using the 0.5m ARCSAT telescope an…

Little Bear’s pulsating stars: Variable star census of UMi dSph Galaxy Open

Karen Kinemuchi, Elizabeth Jeffery, Charles A. Kuehn, Kathleen Grabowski, J. M. Nemec · 2017

\nRecent observations and a photometric search for variable stars in the Ursa Minor dwarf spheroidal galaxy (UMi dSph) are presented. Our observations were taken at Apache Point Observatory in 2014 and 2016 using the 0.5m ARCSAT telescope …

Metal-rich SX Phe stars in theKeplerfield Open

J. M. Nemec, L. A. Balona, Simon J. Murphy, Karen Kinemuchi, Young‐Beom Jeon · 2016

A spectroscopic and photometric analysis has been carried out for thirty-two\ncandidate SX_Phe variable blue straggler stars in the Kepler-field (Balona &\nNemec 2012). Radial velocities (RVs), space motions (U,V,W), projected rotation\nve…

The hot γ Doradus and Maia stars Open

L. A. Balona, C. A. Engelbrecht, Y. C. Joshi, S. C. Joshi, Kaushal Kumar Sharma , et al. · 2016

The hot γ Doradus stars have multiple low frequencies characteristic of γ Dor or SPB variables, but are located between the red edge of the SPB and the blue edge of the γ Dor instability strips where all low-frequency modes are stable in c…

An RR Lyrae family portrait: 33 stars observed in Pisces with K2-E2 Open

L. Molnár, R. Szabó, P. Moskalik, J. M. Nemec, E. Guggenberger , et al. · 2015

A detailed analysis is presented of 33 RR Lyrae stars in Pisces observed with the Kepler space telescope over the 8.9-d long K2 Two-Wheel Concept Engineering Test. The sample includes not only fundamental-mode and first-overtone (RRab and …

Kepler photometry of RRc stars: peculiar double-mode pulsations and period doubling Open

P. Moskalik, R. Smolec, K. Kolenberg, L. Molnár, D. W. Kurtz , et al. · 2015

We present the analysis of four first overtone RR Lyrae stars observed with the Kepler space telescope, based on data obtained over nearly 2.5 yr. All four stars are found to be multiperiodic. The strongest secondary mode with frequency f2…

Metal-Rich SX Phe Stars in theKeplerField Open

J. M. Nemec, L. A. Balona, Karen Kinemuchi, Simon J. Murphy, Young‐Beom Jeon , et al. · 2015

High-resolution spectroscopic observations have been made for 32 of the 34 candidate SX Phe stars identified in the Kepler field by Balona & Nemec (2012). All available long-and short-cadence Q0-Q17 Kepler photometry has been analyzed for …

Ground-BasedBVRITime-Series Follow-Up Observations for the RR Lyrae stars inKeplerField Open

Young Beom Jeon, Chow‐Choong Ngeow, J. M. Nemec · 2015

Time series observations for the 41 RR Lyrae stars in Kepler’s fields were carried out in 2010 to 2013 using a number of meter class (or smaller) telescopes. These telescopes include the 1-m and 41-cm telescopes of Lulin Observatory (LOT a…

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