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A calibration point for stellar evolution from massive star asteroseismology
Siemen Burssens, Dominic M. Bowman, Mathias Michielsen +10
Massive stars are progenitors of supernovae, neutron stars and black holes. During the hydrogen-core burning phase their convective cores are the prime drivers of their evolution,…
Internal Gravity Waves in Massive Stars II: Frequency Analysis Across Stellar Mass
R. P. Ratnasingam, T. M. Rogers, S. Chowdhury +4
Stars with masses above 1.6 solar masses generally possess convective cores and radiative envelopes, which allows the propagation of outward-travelling internal gravity waves. We h…
HD 42477: coupled r modes, g modes and a p mode in an A0Vnne star
D. W. Kurtz, R. Jayaraman, P. Sowicka +4
Several studies have shown that a number of stars pulsating in p modes lie between the Cep and Sct instability strips in the Hertzsprung-Russell (HR) Diagram. At present, t…
Comprehensive spectroscopic and photometric study of pulsating eclipsing binary star AI Hya
F. Kahraman Alicavus, T. Pawar, K. G. Hełminiak +9
The pulsating eclipsing binaries are remarkable systems that provide an opportunity to probe the stellar interior and to determine the fundamental stellar parameters precisely. Esp…
Kepler and TESS Observations of PG 1159-035
Gabriela Oliveira da Rosa, S. O. Kepler, Alejandro H. Córsico +11
PG 1159-035 is the prototype of the DOV hot pre-white dwarf pulsators. It was observed during the Kepler satellite K2 mission for 69 days in 59 s cadence mode and by the TESS satel…
Tidally Tilted Pulsations in HD 265435, a subdwarf B Star with a Close White Dwarf Companion
Rahul Jayaraman, Gerald Handler, Saul Rappaport +4
Tidally tilted pulsators (TTPs) are an intriguing new class of oscillating stars in binary systems; in such stars, the pulsation axis coincides with the line of apsides, or semi-ma…
Tidally Tilted Pulsators
Gerald Handler, Rahul Jayaraman, Donald W. Kurtz +2
The tidally tilted pulsators are a new type of oscillating star in close binary systems that have their pulsation axis in the orbital plane because of the tidal distortion caused b…
Mass transfer and tidally tilted pulsation in the Algol-type system TZ Dra
F. Kahraman Alicavus, G. Handler, F. Alicavus +6
Oscillating eclipsing Algols (oEAs) are remarkable systems which allow us to determine accurate fundamental stellar parameters (mass, radius) and probe the stellar interiors throug…
Two New roAp Stars Discovered with TESS
Rahul Jayaraman, Donald W. Kurtz, Gerald Handler +2
We present two new rapidly oscillating Ap (roAp) stars, TIC 198781841 and TIC 229960986, discovered in TESS photometric data. The periodogram of TIC 198781841 has a large peak at 1…
TIC 5724661: A Long-Period Binary with a Pulsating sdB Star and Scuti Variable
Rahul Jayaraman, Saul Rappaport, Lorne Nelson +8
Using TESS 20-sec cadence data, we have discovered an unusual combination of pulsating stars in what we infer to be a binary system. The binary consists of a standard Scuti sta…
Five years of BRITE-Constellation photometry of the luminous blue variable P Cygni: properties of the stochastic low-frequency variability
Ashley Elliott, Noel D. Richardson, Herbert Pablo +9
Luminous Blue Variables (LBVs) are massive stars that are likely to be a transitionary phase between O stars and hydrogen-free classical Wolf-Rayet stars. The variability of these…
Delta Scuti Variables
Gerald Handler
We review recent research on Delta Scuti stars from an observer's viewpoint. First, some signposts helping to lead the way through the Delta Scuti jungle are placed. Then, some pro…
The Missing Link? Discovery of Pulsations in the Nitrogen-rich PG 1159 Star PG 1144+005
Paulina Sowicka, Gerald Handler, David Jones +1
Up to 98% of all single stars will eventually become white dwarfs - stars that link the history and future evolution of the Galaxy, and whose previous evolution is engraved in thei…
Discovery of multiple p-mode pulsation frequencies in the roAp star, HD 86181
Fangfei Shi, Donald W. Kurtz, Daniel L. Holdsworth +5
We report the frequency analysis of a known roAp star, HD 86181 (TIC 469246567), with new inferences from TESS data. We derive the rotation frequency to be = 0.48753 $\pm…
Space Photometry with BRITE-Constellation
Weiss W. W, Zwintz K., Kuschnig R. +16
BRITE-Constellation is devoted to high-precision optical photometric monitoring of bright stars, distributed all over the Milky Way, in red and/or blue passbands. Photometry from s…
Mode identification and seismic study of Scuti, the prototype of a class of pulsating stars
Jadwiga Daszynska-Daszkiewicz, A. A. Pamyatnykh, P. Walczak +3
We present a seismic study of Scuti based on a mode identification from multicoulor photometry. The dominant frequency can be associated only with a radial mode and the second…
A tidally tilted sectoral dipole pulsation mode in the eclipsing binary TIC 63328020
S. A. Rappaport, D. W. Kurtz, G. Handler +13
We report the discovery of the third tidally tilted pulsator, TIC 63328020. Observations with the TESS satellite reveal binary eclipses with an orbital period of 1.1057 d, and …
Asteroseismology of sz lyn using multi-band high time resolution photometry from ground and space
J. Adassuriya, S. Ganesh, J. L. Gutierrez +4
We report the analysis of high temporal resolution ground and space based photometric observations of SZ Lyncis, a binary star one of whose components is a high amplitude Scuti…
New BRITE-Constellation observations of the roAp star Alpha Circini
W. W. Weiss, H. -E. Fröhlich, T. Kallinger +11
Chemically peculiar (CP) stars with a measurable magnetic field comprise the group of mCP stars. The pulsating members define the subgroup of rapidly oscillating Ap (roAp) stars, o…
BRITE photometry and STELLA spectroscopy of bright stars in Auriga: Rotation, pulsation, orbits, and eclipses
K. G. Strassmeier, T. Granzer, M. Weber +7
Continuous photometry with up to three BRITE satellites was obtained for 12 targets and subjected to a period search. Contemporaneous high-resolution optical spectroscopy with STEL…
Data Analysis of Bright Main-Sequence A- and B-type Stars Observed Using the TESS and BRITE Spacecraft
Joyce A. Guzik, Jason Jackiewicz, Andrzej Pigulski +5
During the last two years we have received long time-series photometric observations of bright (V mag < 8) main-sequence A- and B-type stars observed by the NASA TESS spacecraft an…
TESS photometry of extreme helium stars PV Tel and V821 Cen
C. Simon Jeffery, Geert Barentsen, Gerald Handler
PV Tel variables are extreme helium (EHe) stars known to be intrinsic light and velocity variable on characteristic timescales 0.1 - 2 d. With two exceptions, they are best describ…
The single-sided pulsator CO~Camelopardalis
D. W. Kurtz, G. Handler, S. A. Rappaport +10
CO~Cam (TIC 160268882) is the second ``single-sided pulsator'' to be discovered. These are stars where one hemisphere pulsates with a significantly higher amplitude than the other…
Short-term variability and mass loss in Be stars V. Space photometry and ground-based spectroscopy of Cas
Camilla C. Borre, Dietrich Baade, Andrzej Pigulski +9
Context. Be stars are physically complex systems that continue to challenge theory to understand their rapid rotation, complex variability and decretion disks. Cassiopeiae (…