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91.
92.
Nonstandard theories of fundamental interactions typically predict the existence of new kinds of weakly interacting particles.
These can escape freely from stellar interiors and act as additional source of cooling. Considerable agreement of a variety
of astrophysical observations with standard physics can serve as a source of constraints on non-standard ideas. In this paper
we consider G117-B15A pulsating white dwarf for which the secular rate, at which the period of its fundamental mode increases,
has been accurately measured. This star has been claimed the most stable oscillator ever recorded in the optical band. Because
an additional channel of energy loss would speedup the cooling rate, one is able to use this stability to derive a bound on
axion mass and on theories with large extra dimensions. We also point to the possibility of using similar arguments to constrain
supersymmetric paticles.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
93.
Pavel Mayer Marek Wolf P. G. Niarchos K. D. Gazeas V. N. Manimanis Drahomír Chochol 《Astrophysics and Space Science》2006,304(1-4):39-41
New precise times of minimum light for several early-type eclipsing binaries were obtained at three observatories. The changes of period of the following measured binaries are discussed: V1182 Aql, LY Aur, SZ Cam, FZ CMa, QZ Car, LZ Cen, V606 Cen, AH Cep and TU~Mus. 相似文献
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For perfectly aligned heliostats and coelostats tracking at the solar rate and half the solar rate, respectively, the solar beam has no translational motion. But, particularly in the field at eclipses, it is not possible to align heliostats and coelostats with infinite precision. We derive the effect of small misalignments on the translational motion of the beam, and give tables to allow the calculation of the accuracy to which the instruments must be mounted and adjusted to attain a desired accuracy over a given duration. Further, we show how to derive the necessary adjustments to improve alignment, given measurements of the tracking error. 相似文献
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Lepore Simone Polkowski Marcin Grad Marek 《International Journal of Earth Sciences》2018,107(6):2043-2062
International Journal of Earth Sciences - The P-wave velocities (Vp) within the East European Craton in Poland are well known through several seismic experiments which permitted to build a... 相似文献
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