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Start Over Author "Bowman, D." Journal monthly notices of the royal astronomical society
24 results on '"Bowman, D."'

1. TESS Cycle 2 observations of roAp stars with 2-min cadence data

Author

Holdsworth, D L, primary, Cunha, M S, additional, Lares-Martiz, M, additional, Kurtz, D W, additional, Antoci, V, additional, Barceló Forteza, S, additional, De Cat, P, additional, Derekas, A, additional, Kayhan, C, additional, Ozuyar, D, additional, Skarka, M, additional, Hey, D R, additional, Shi, F, additional, Bowman, D M, additional, Kobzar, O, additional, Ayala Gómez, A, additional, Bognár, Zs, additional, Buzasi, D L, additional, Ebadi, M, additional, Fox-Machado, L, additional, García Hernández, A, additional, Ghasemi, H, additional, Guzik, J A, additional, Handberg, R, additional, Handler, G, additional, Hasanzadeh, A, additional, Jayaraman, R, additional, Khalack, V, additional, Kochukhov, O, additional, Lovekin, C C, additional, Mikołajczyk, P, additional, Mkrtichian, D, additional, Murphy, S J, additional, Niemczura, E, additional, Olafsson, B G, additional, Pascual-Granado, J, additional, Paunzen, E, additional, Posiłek, N, additional, Ramón-Ballesta, A, additional, Safari, H, additional, Samadi-Ghadim, A, additional, Smalley, B, additional, Sódor, Á, additional, Stateva, I, additional, Suárez, J C, additional, Szabó, R, additional, Wu, T, additional, Ziaali, E, additional, Zong, W, additional, and Seager, S, additional

Published
2023
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2. TESS Cycle 2 observations of roAp stars with 2-min cadence data.

Author

Holdsworth, D L, Cunha, M S, Lares-Martiz, M, Kurtz, D W, Antoci, V, Barceló Forteza, S, De Cat, P, Derekas, A, Kayhan, C, Ozuyar, D, Skarka, M, Hey, D R, Shi, F, Bowman, D M, Kobzar, O, Ayala Gómez, A, Bognár, Zs, Buzasi, D L, Ebadi, M, and Fox-Machado, L

Subjects
STELLAR oscillations, STAR observations, STELLAR populations, NOVAE (Astronomy), ASTEROSEISMOLOGY
Abstract

We present the results of a systematic search of the Transiting Exoplanet Survey Satellite (TESS) 2-min cadence data for new rapidly oscillating Ap (roAp) stars observed during the Cycle 2 phase of its mission. We find seven new roAp stars previously unreported as such and present the analysis of a further 25 roAp stars that are already known. Three of the new stars show multiperiodic pulsations, while all new members are rotationally variable stars, leading to almost 70 per cent (22) of the roAp stars presented being α2 CVn-type variable stars. We show that targeted observations of known chemically peculiar stars are likely to overlook many new roAp stars, and demonstrate that multiepoch observations are necessary to see pulsational behaviour changes. We find a lack of roAp stars close to the blue edge of the theoretical roAp instability strip, and reaffirm that mode instability is observed more frequently with precise, space-based observations. In addition to the Cycle 2 observations, we analyse TESS data for all-known roAp stars. This amounts to 18 further roAp stars observed by TESS. Finally, we list six known roAp stars that TESS is yet to observe. We deduce that the incidence of roAp stars amongst the Ap star population is just 5.5  per cent, raising fundamental questions about the conditions required to excite pulsations in Ap stars. This work, coupled with our previous work on roAp stars in Cycle 1 observations, presents the most comprehensive, homogeneous study of the roAp stars in the TESS nominal mission, with a collection of 112 confirmed roAp stars in total. [ABSTRACT FROM AUTHOR]

Published
2024
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6. TESS cycle 1 observations of roAp stars with 2-min cadence data

Author

Holdsworth, D L, primary, Cunha, M S, additional, Kurtz, D W, additional, Antoci, V, additional, Hey, D R, additional, Bowman, D M, additional, Kobzar, O, additional, Buzasi, D L, additional, Kochukhov, O, additional, Niemczura, E, additional, Ozuyar, D, additional, Shi, F, additional, Szabó, R, additional, Samadi-Ghadim, A, additional, Bognár, Zs, additional, Fox-Machado, L, additional, Khalack, V, additional, Lares-Martiz, M, additional, Lovekin, C C, additional, Mikołajczyk, P, additional, Mkrtichian, D, additional, Pascual-Granado, J, additional, Paunzen, E, additional, Richey-Yowell, T, additional, Sódor, Á, additional, Sikora, J, additional, Yang, T Z, additional, Brunsden, E, additional, David-Uraz, A, additional, Derekas, A, additional, García Hernández, A, additional, Guzik, J A, additional, Hatamkhani, N, additional, Handberg, R, additional, Lambert, T S, additional, Lampens, P, additional, Murphy, S J, additional, Monier, R, additional, Pollard, K R, additional, Quitral-Manosalva, P, additional, Ramón-Ballesta, A, additional, Smalley, B, additional, Stateva, I, additional, and Vanderspek, R, additional

Published
2021
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11. The first view of δ Scuti and γ Doradus stars with the TESS mission

Author

Antoci, V, primary, Cunha, M S, additional, Bowman, D M, additional, Murphy, S J, additional, Kurtz, D W, additional, Bedding, T R, additional, Borre, C C, additional, Christophe, S, additional, Daszyńska-Daszkiewicz, J, additional, Fox-Machado, L, additional, García Hernández, A, additional, Ghasemi, H, additional, Handberg, R, additional, Hansen, H, additional, Hasanzadeh, A, additional, Houdek, G, additional, Johnston, C, additional, Justesen, A B, additional, Kahraman Alicavus, F, additional, Kotysz, K, additional, Latham, D, additional, Matthews, J M, additional, Mønster, J, additional, Niemczura, E, additional, Paunzen, E, additional, Sánchez Arias, J P, additional, Pigulski, A, additional, Pepper, J, additional, Richey-Yowell, T, additional, Safari, H, additional, Seager, S, additional, Smalley, B, additional, Shutt, T, additional, Sódor, A, additional, Suárez, J-C, additional, Tkachenko, A, additional, Wu, T, additional, Zwintz, K, additional, Barceló Forteza, S, additional, Brunsden, E, additional, Bognár, Z, additional, Buzasi, D L, additional, Chowdhury, S, additional, De Cat, P, additional, Evans, J A, additional, Guo, Z, additional, Guzik, J A, additional, Jevtic, N, additional, Lampens, P, additional, Lares Martiz, M, additional, Lovekin, C, additional, Li, G, additional, Mirouh, G M, additional, Mkrtichian, D, additional, Monteiro, M J P F G, additional, Nemec, J M, additional, Ouazzani, R-M, additional, Pascual-Granado, J, additional, Reese, D R, additional, Rieutord, M, additional, Rodon, J R, additional, Skarka, M, additional, Sowicka, P, additional, Stateva, I, additional, Szabó, R, additional, and Weiss, W W, additional

Published
2019
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14. Rotation and pulsation in Ap stars: first light results from TESS sectors 1 and 2

Author

Cunha, M S, primary, Antoci, V, additional, Holdsworth, D L, additional, Kurtz, D W, additional, Balona, L A, additional, Bognár, Zs, additional, Bowman, D M, additional, Guo, Z, additional, Kołaczek-Szymański, P A, additional, Lares-Martiz, M, additional, Paunzen, E, additional, Skarka, M, additional, Smalley, B, additional, Sódor, Á, additional, Kochukhov, O, additional, Pepper, J, additional, Richey-Yowell, T, additional, Ricker, G R, additional, Seager, S, additional, Buzasi, D L, additional, Fox-Machado, L, additional, Hasanzadeh, A, additional, Niemczura, E, additional, Quitral-Manosalva, P, additional, Monteiro, M J P F G, additional, Stateva, I, additional, De Cat, P, additional, García Hernández, A, additional, Ghasemi, H, additional, Handler, G, additional, Hey, D, additional, Matthews, J M, additional, Nemec, J M, additional, Pascual-Granado, J, additional, Safari, H, additional, Suárez, J C, additional, Szabó, R, additional, Tkachenko, A, additional, and Weiss, W W, additional

Published
2019
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21. Magnetic OB[A] Stars with TESS : probing their Evolutionary and Rotational properties (MOBSTER) – I. First-light observations of known magnetic B and A stars.

Author

David-Uraz, A, Neiner, C, Sikora, J, Bowman, D M, Petit, V, Chowdhury, S, Handler, G, Pergeorelis, M, Cantiello, M, Cohen, D H, Erba, C, Keszthelyi, Z, Khalack, V, Kobzar, O, Kochukhov, O, Labadie-Bartz, J, Lovekin, C C, MacInnis, R, Owocki, S P, and Pablo, H

Subjects
B stars, STELLAR magnetic fields, STELLAR oscillations, STARS, MAGNETIC field measurements, ZEEMAN effect
Published
2019
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22. Binary asteroseismic modelling: isochrone-cloud methodology and application to Kepler gravity mode pulsators.

Author

Johnston, C, Tkachenko, A, Aerts, C, Molenberghs, G, Bowman, D M, Pedersen, M G, Buysschaert, B, and Pápics, P I

Subjects
BINARY stars, STELLAR oscillations, GRAVITATIONAL waves, STELLAR evolution
Abstract

The simultaneous presence of variability due to both pulsations and binarity is no rare phenomenon. Unfortunately, the complexities of dealing with even one of these sources of variability individually means that the other signal is often treated as a nuisance and discarded. However, both types of variability offer means to probe fundamental stellar properties in robust ways through asteroseismic and binary modelling. We present an efficient methodology that includes both binary and asteroseismic information to estimate fundamental stellar properties based on a grid-based modelling approach. We report parameters for three gravity mode pulsating Kepler binaries, such as mass, radius, age, as well the mass of the convective core and location of the overshoot region. We discuss the presence of parameter degeneracies and the way our methodology deals with them. We provide asteroseismically calibrated isochrone-clouds to the community; these are a generalization of isochrones when allowing for different values of the core overshooting in the two components of the binary. [ABSTRACT FROM AUTHOR]

Published
2019
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23. K2 photometry and HERMES spectroscopy of the blue supergiant rho Leo: rotational wind modulation and low-frequency waves.

Author

Aerts, C., Bowman, D. M., Símon-Díaz,, S., Buysschaert, B., Johnston, C., Moravveji, E., Beck, P. G., De Cat, P., Triana, S., Aigrain, S., Castro, N., Huber, D., and White, T.

Subjects
*ASTRONOMICAL photometry, *SUPERGIANT stars, *LIGHT curves of variable stars, *STELLAR rotation, *STELLAR mass, *STAR formation
Abstract

We present an 80-d long uninterrupted high-cadence K2 light curve of the B1Iab supergiant rho Leo (HD91316), deduced with the method of halo photometry. This light curve reveals a dominant frequency of frot = 0.0373 d-1 and its harmonics. This dominant frequency corresponds with a rotation period of 26.8 d and is subject to amplitude and phase modulation. The K2 photometry additionally reveals multiperiodic low-frequency variability (<1.5 d-1) and is in full agreement with low-cadence high-resolution spectroscopy assembled during 1800 d. The spectroscopy reveals rotational modulation by a dynamic aspherical wind with an amplitude of about 20 km s-1 in the Ha line, as well as photospheric velocity variations of a few kms-1 at frequencies in the range 0.2-0.6 d-1 in the Si III 4567Å line. Given the large macroturbulence needed to explain the spectral line broadening of the star, we interpret the detected photospheric velocity as due to travelling superinertial low-degree large-scale gravity waves with dominant tangential amplitudes and discuss why rho Leo is an excellent target to study how the observed photospheric variability propagates into the wind. [ABSTRACT FROM AUTHOR]

Published
2018
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24. Spectroscopic survey of Kepler stars.★ I. HERMES/Mercator observations of A- and F-type stars

Author

Niemczura, E., primary, Murphy, S. J., additional, Smalley, B., additional, Uytterhoeven, K., additional, Pigulski, A., additional, Lehmann, H., additional, Bowman, D. M., additional, Catanzaro, G., additional, van Aarle, E., additional, Bloemen, S., additional, Briquet, M., additional, De Cat, P., additional, Drobek, D., additional, Eyer, L., additional, Gameiro, J. F. S., additional, Gorlova, N., additional, Kamiński, K., additional, Lampens, P., additional, Marcos-Arenal, P., additional, Pápics, P. I., additional, Vandenbussche, B., additional, Van Winckel, H., additional, Stȩślicki, M., additional, and Fagas, M., additional

Published
2015
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