Zobrazeno 1 - 10
of 305
pro vyhledávání: '"Balona, L"'
Autor:
Krzesinski, J., Balona, L. A.
Publikováno v:
A&A 663, A45 (2022)
This work is dedicated to a search for new pulsating hot subdwarfs in TESS photometric data which could have been missed in previous searches. By matching catalogues of hot subdwarfs with TESS targets and using luminosities from Gaia parallaxes, a li
Externí odkaz:
http://arxiv.org/abs/2204.01604
Autor:
Balona, L. A.
From sector 1--44 {\em TESS} observations, 19 new roAp stars, 103 ostensibly non-peculiar stars with roAp-like frequencies and 617 $\delta$~Scuti stars with independent frequencies typical of roAp stars were found. Examination of all chemically pecul
Externí odkaz:
http://arxiv.org/abs/2109.02246
Autor:
Balona, L. A.
About 22000 Kepler stars and nearly 60000 TESS stars from sectors 1-24 have been classified according to variability type. A large proportion of stars of all spectral types appear to have periods consistent with the expected rotation periods. A previ
Externí odkaz:
http://arxiv.org/abs/2008.06305
Autor:
Balona, L. A.
Kepler short-cadence photometry of 2347 stars with effective temperatures in the range 6000-10000 K was used to search for the presence of solar-like oscillations. The aim is to establish the location of the hot end of the stochastic convective excit
Externí odkaz:
http://arxiv.org/abs/2008.06299
Autor:
Balona, L. A., Ozuyar, D.
In this work, we study the general characteristics of Be star light curves from TESS sectors 1-26 in the light of a model we call the "impulsive magnetic rotator". It is found that 73 percent of 441 classical Be stars are short-period variables. The
Externí odkaz:
http://arxiv.org/abs/2008.06288
Autor:
Cunha, M. S., Antoci, V., Holdsworth, D. L., Kurtz, D. W., Balona, L. A., Bognár, Zs., Bowman, D. M., Guo, Z., Kołaczek-Szymański, P. A., Lares-Martiz, M., Paunzen, E., Skarka, M., Smalley, B., Sódor, Á., Kochukhov, O., Pepper, J., Richey-Yowell, T., Ricker, G. R., Seager, S., Buzasi, D. L., Fox-Machado, L., Hasanzadeh, A., Niemczura, E., Quitral-Manosalva, P., Monteiro, M. J. P. F. G., Stateva, I., De Cat, P., Hernández, A. García, Ghasemi, H., Handler, G., Hey, D., Matthews, J. M., Nemec, J. M., Pascual-Granado, J., Safari, H., Suárez, J. C., Szabó, R., Tkachenko, A., Weiss, W. W.
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 sample of 83 s
Externí odkaz:
http://arxiv.org/abs/1906.01111
Autor:
Balona, L. A., Handler, G., Chowdhury, S., Ozuyar, D., Engelbrecht, C. A., Mirouh, G. M., Wade, G. A., David-Uraz, A., Cantiello, M.
Light curves and periodograms of 160 B stars observed by the TESS space mission and 29 main-sequence B stars from Kepler and K2 were used to classify the variability type. There are 114 main-sequence B stars in the TESS sample, of which 45 are classi
Externí odkaz:
http://arxiv.org/abs/1902.09470
Autor:
Balona, L. A., Engelbrecht, C. A., Joshi, Yogesh C., Joshi, S., Sharma, K., Semenko, E., Pandey, G., Chakradhari, N. K., Mkrtichian, David, Hema, B. P., Nemec, J. M.
The hot $\gamma$~Doradus stars have multiple low frequencies characteristic of $\gamma$~Dor or SPB variables, but are located between the red edge of the SPB and the blue edge of the $\gamma$~Dor instability strips where all low-frequency modes are s
Externí odkaz:
http://arxiv.org/abs/1606.06426
We present light curves and periodograms for 27 stars in the young Upper Scorpius association (age=$11 \pm 1$\,Myr) obtained with the Kepler spacecraft. This association is only the second stellar grouping to host several pulsating pre-main sequence
Externí odkaz:
http://arxiv.org/abs/1509.06943
Autor:
Smalley, B., Niemczura, E., Murphy, S. J., Lehmann, H., Kurtz, D. W., Holdsworth, D. L., Cunha, M. S., Balona, L. A., Briquet, M., Bruntt, H., de Cat, P., Lampens, P., Thygesen, A. O., Uytterhoeven, K.
We report the identification of 61.45 d^-1 (711.2 mu Hz) oscillations, with amplitudes of 62.6-mu mag, in KIC 4768731 (HD 225914) using Kepler photometry. This relatively bright (V=9.17) chemically peculiar star with spectral type A5 Vp SrCr(Eu) has
Externí odkaz:
http://arxiv.org/abs/1507.01516