Zobrazeno 1 - 10
of 1 672
pro vyhledávání: '"Heber, U"'
Autor:
Geier, S., Heber, U., Irrgang, A., Dorsch, M., Bastian, A., Neunteufel, P., Kupfer, T., Bloemen, S., Kreuzer, S., Möller, L., Schindewolf, M., Schneider, D., Ziegerer, E., Pelisoli, I., Schaffenroth, V., Barlow, B. N., Raddi, R., Geier, S. J., Reindl, N., Rauch, T., Nemeth, P., Gänsicke, B. T.
Hot subdwarfs (sdO/B) are the stripped helium cores of red giants formed by binary interactions. Close hot subdwarf binaries with massive white dwarf companions have been proposed as possible progenitors of thermonuclear supernovae type Ia (SN Ia). I
Externí odkaz:
http://arxiv.org/abs/2407.04479
Autor:
Dawson, H., Geier, S., Heber, U., Pelisoli, I., Dorsch, M., Schaffenroth, V., Reindl, N., Culpan, R., Pritzkuleit, M., Vos, J., Soemitro, A. A., Roth, M. M., Schneider, D., Uzundag, M., Vučković, M., Amaral, L. Antunes, Istrate, A. G., Justham, S., Østensen, R. H., Telting, J. H., Djupvik, A. A., Raddi, R., Green, E. M., Jeffery, C. S., Kepler, S. O., Munday, J., Steinmetz, T., Kupfer, T.
We present the first volume-limited sample of spectroscopically confirmed hot subluminous stars out to 500 pc, defined using the accurate parallax measurements from the {\em Gaia} space mission data release 3 (DR3). The sample comprises a total of 39
Externí odkaz:
http://arxiv.org/abs/2403.15513
Autor:
Latour, M., Hämmerich, S., Dorsch, M., Heber, U., Husser, T. -O., Kamann, S., Dreizler, S., Brinchmann, J.
Publikováno v:
A&A 677, A86 (2023)
In this work, we characterize the properties of HB stars in the GCs $\omega$ Cen and NGC 6752. We use dedicated model atmospheres and synthetic spectra grids computed using a hybrid LTE/NLTE modeling approach to fit the MUSE spectra of HB stars hotte
Externí odkaz:
http://arxiv.org/abs/2306.14549
Autor:
Geier, S., Dorsch, M., Dawson, H., Pelisoli, I., Munday, J., Marsh, T. R., Schaffenroth, V., Heber, U.
Publikováno v:
A&A 677, A11 (2023)
We report the discovery of the first hot subdwarf B (sdB) star with a massive compact companion in a wide ($P=892.5\pm60.2\,{\rm d}$) binary system. It was discovered based on an astrometric binary solution provided by the Gaia mission Data Release 3
Externí odkaz:
http://arxiv.org/abs/2305.03475
Autor:
Sebastian, D., Guenther, E. W., Deleuil, M., Dorsch, M., Heber, U., Heuser, C., Gandolfi, D., Grziwa, S., Deeg, H. J., Alonso, R., Bouchy, F., Csizmadia, Sz., Cusano, F., Fridlund, M., Geier, S., Irrgang, A., Korth, J., Nespral, D., Rauer, H., Tal-Or, L.
Theories of planet formation give contradicting results of how frequent close-in giant planets of intermediate mass stars (IMSs; $\rm 1.3\leq M_{\star}\leq 3.2\,M_{\rm \odot}$) are. Some theories predict a high rate of IMSs with close-in gas giants,
Externí odkaz:
http://arxiv.org/abs/2207.08742
Autor:
Pelisoli, Ingrid, Dorsch, M., Heber, U., Gänsicke, B., Geier, S., Kupfer, T., Németh, P., Scaringi, S., Schaffenroth, V.
Magnetic fields can play an important role in stellar evolution. Among white dwarfs, the most common stellar remnant, the fraction of magnetic systems is more than 20 per cent. The origin of magnetic fields in white dwarfs, which show strengths rangi
Externí odkaz:
http://arxiv.org/abs/2204.06575
Autor:
Ramsay, G., Woudt, P. A., Kupfer, T., van Roestel, J., Patterson, K., Warner, B., Buckley, D. A. H., Groot, P. J., Heber, U., Irrgang, A., Jeffery, C. S., Motsoaledi, M., Schwartz, M. J., Wevers, T.
Blue Large Amplitude Pulsators (BLAPs) are a relatively new class of blue variable stars showing periodic variations in their light curves with periods shorter than a few tens of mins and amplitudes of more than ten percent. We report nine blue varia
Externí odkaz:
http://arxiv.org/abs/2204.03265
Publikováno v:
A&A 661, A113 (2022)
Hot subdwarf stars represent a late and peculiar stage in the evolution of low-mass stars, because they are likely formed by close binary interactions. Here we performed a radial velocity (RV) variability study of a sample of 646 hot subdwarfs with m
Externí odkaz:
http://arxiv.org/abs/2202.09608
Autor:
Filipović, Miroslav D., Payne, J. L., Alsaberi, R. Z. E., Norris, R. P., Macgregor, P. J., Rudnick, L., Koribalski, B. S., Leahy, D., Ducci, L., Kothes, R., Andernach, H., Barnes, L., Bojičić, I. S., Bozzetto, L. M., Brose, R., Collier, J. D., Crawford, E. J., Crocker, R. M., Dai, S., Galvin, T. J., Haberl, F., Heber, U., Hill, T., Hopkins, A. M., Hurley-Walker, N., Ingallinera, A., Jarrett, T., Kavanagh, P. J., Lenc, E., Luken, K. J., Mackey, D., Manojlović, P., Maggi, P., Maitra, C., Pennock, C. M., Points, S., Riggi, S., Rowell, G., Safi-Harb, S., Sano, H., Sasaki, M., Shabala, S., Stevens, J., van Loon, J. Th., Tothill, N. F. H., Umana, G., Urošević, D., Velović, V., Vernstrom, T., West, J. L., Wan, Z.
We report the discovery of J0624-6948, a low-surface brightness radio ring, lying between the Galactic Plane and the Large Magellanic Cloud (LMC). It was first detected at 888 MHz with the Australian Square Kilometre Array Pathfinder (ASKAP), and wit
Externí odkaz:
http://arxiv.org/abs/2201.10026
Publikováno v:
A&A 658, L9 (2022)
Helium-rich hot subdwarf stars of spectral type O (He-sdO) are considered prime candidates for stellar merger remnants. Such events should lead to the generation of strong magnetic fields. However, no magnetic He-sdO has yet been unambiguously discov
Externí odkaz:
http://arxiv.org/abs/2201.08146