Zobrazeno 1 - 10
of 217
pro vyhledávání: '"Morales Rueda, L."'
Autor:
Geier, S., Heber, U., Edelmann, H., Morales-Rueda, L., Kilkenny, D., O'Donoghue, D., Marsh, T. R., Copperwheat, C.
Atmospheric parameters and helium abundances of 44 bright subdwarf B stars have been determined. More than half of our sample consists of newly discovered stars from the Edinburgh Cape survey. We showed that effective temperatures and surface graviti
Externí odkaz:
http://arxiv.org/abs/1307.5980
We measured projected rotational velocities of more than a hundred apparently single sdBs. A comparison is made with sdB stars in binary systems with orbits so wide, that tidal interaction becomes negligible. All of these stars are slow rotators (vsi
Externí odkaz:
http://arxiv.org/abs/1112.2925
Autor:
Geier, S., Heber, U., Edelmann, H., Morales-Rueda, L., Kilkenny, D., O'Donoghue, D., Marsh, T. R., Copperwheat, C.
Helium abundances and atmospheric parameters have been determined from high resolution spectra for a new sample of 46 bright hot subdwarf B (sdB) stars. The helium abundances have been measured with high accuracy. We confirm the correlation of helium
Externí odkaz:
http://arxiv.org/abs/1112.2918
Autor:
Geier, S., Classen, L., Bruenner, P., Nagel, K., Schaffenroth, V., Heuser, C., Heber, U., Drechsel, H., Edelmann, H., Koen, C., O'Toole, S. J., Morales-Rueda, L.
It has been suggested that besides stellar companions, substellar objects in close orbits may be able to trigger mass loss in a common envelope phase and form hot subdwarfs. In an ongoing project we search for close substellar companions combining ti
Externí odkaz:
http://arxiv.org/abs/1112.2929
Autor:
Deca, J., Marsh, T. R., Østensen, R. H., Morales-Rueda, L., Copperwheat, C. M., Wade, R. A., Stark, M. A., Maxted, P. F. L., Nelemans, G., Heber, U.
About 50% of all known hot subdwarf B stars (sdBs) reside in close (short period) binaries, for which common envelope ejection is the most likely formation mechanism. However, Han et al. 2003 predict that the majority of sdBs should form through stab
Externí odkaz:
http://arxiv.org/abs/1111.3576
Subdwarf B (sdB) stars are hot, sub-luminous stars which are thought to be core-helium burning with thin hydrogen envelopes. The mechanism by which these stars lose their envelopes has been controversial but it has been argued that binary star intera
Externí odkaz:
http://arxiv.org/abs/1103.4745
Substellar objects, like planets and brown dwarfs orbiting stars, are by-products of the star formation process. The evolution of their host stars may have an enourmous impact on these small companions. Vice versa a planet might also influence stella
Externí odkaz:
http://arxiv.org/abs/0908.1025
Autor:
Groot, Paul J., Verbeek, K., Greimel, R., Irwin, M., Gonzalez-Solares, E., Gaensicke, B., de Groot, E., Drew, J., Augusteijn, T., Aungwerojwit, A., Barlow, M., Barros, S., Besselaar, E. van den, Casares, J., Corradi, R., Corral-Santana, J., Deacon, N., van Ham, W., Hu, Haili, Heber, U., Jonker, P. G., King, R., Knigge, C., Mampaso, A., Marsh, T., Morales-Rueda, L., Napiwotzki, R., Naylor, T., Nelemans, G., Oosting, T., Pyrzas, S., Pretorius, M., Rodriguez-Gil, P., Roelofs, G., Sale, S., Schellart, P., Steeghs, D., Szyszka, C., Unruh, Y., Walton, N., Weston, S., Witham, A., Woudt, P., Zijlstra, A.
The UV-Excess Survey of the Northern Galactic Plane images a 10x185 degree wide band, centered on the Galactic Equator using the 2.5m Isaac Newton Telescope in four bands (U,g,r,HeI5875) down to ~21st-22nd magnitude (~20th in HeI5875). The setup and
Externí odkaz:
http://arxiv.org/abs/0906.3498
Autor:
Wesson, R., Barlow, M. J., Corradi, R. L. M., Drew, J. E., Groot, P. J., Knigge, C., Steeghs, D., Gaensicke, B. T., Napiwotzki, R., Rodriguez-Gil, P., Zijlstra, A. A., Bode, M. F., Drake, J. J., Frew, D. J., Gonzalez-Solares, E. A., Greimel, R., Irwin, M. J., Morales-Rueda, L., Nelemans, G., Parker, Q. A., Sale, S. E., Sokoloski, J. L., Somero, A., Uthas, H., Walton, N. A., Warner, B., Watson, C. A., Wright, N. J.
Nova V458 Vul erupted on 2007 August 8th and reached a visual magnitude of 8.1 a few days later. H$\alpha$ images obtained six weeks before the outburst as part of the IPHAS galactic plane survey reveal an 18th magnitude progenitor surrounded by an e
Externí odkaz:
http://arxiv.org/abs/0810.0401
Autor:
Unda-Sanzana, E., Marsh, T. R., Gansicke, B. T., Maxted, P. F. L., Morales-Rueda, L., Dhillon, V. S., Thoroughgood, T. D., Tremou, E., Watson, C. A., Hinojosa-Goni, R.
GD 552 is a high proper motion star with the strong, double-peaked emission lines characteristic of the dwarf nova class of cataclysmic variable star, and yet no outburst has been detected during the past 12 years of monitoring. We present spectrosco
Externí odkaz:
http://arxiv.org/abs/0806.4892