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58 papers · 1 filter
Towards the undestanding of radial velocity pulsation in roAp stars
J. C. Sousa, M. S. Cunha
High-resolution spectroscopic time series of rapidly oscillating Ap stars show evidence for a co-existence of standing and running waves in their atmospheric layers. With the purpo…
CaII Infrared triplet line models in Classical T Tauri stars
R. Azevedo, N. Calvet, L. Hartmann +3
We study the formation of the calcium II infrared triplet lines 8498Å, 8542Åand 8662Å, in the accreting magnetospheric flows of Classical T Tauri stars (CTTS), and present a grid o…
A time of flight method to measure the speed of sound using a stereo sound card
Carlos C. Carvalho, J. M. B. Lopes dos Santos, M. B. Marques
We present an inexpensive apparatus for measuring the speed of sound, with a time of flight method, using a computer with a stereo sound board. Students measure the speed of sound…
Modeling disorder in graphene
Vitor M. Pereira, J. M. B. Lopes dos Santos, A. H. Castro Neto
We present a study of different models of local disorder in graphene. Our focus is on the main effects that vacancies -- random, compensated and uncompensated --, local impurities…
Seismic evolution of low/intermediate mass PMS stars
F. J. G. Pinheiro
This article presents a study of the evolution of the internal structure and seismic properties expected for low/intermediate mass Pre-Main Sequence (PMS) stars. Seismic and non-se…
Matter-wave solitons with a periodic, piecewise-constant nonlinearity
A. S. Rodrigues, P. G. Kevrekidis, Mason A. Porter +3
Motivated by recent proposals of ``collisionally inhomogeneous'' Bose-Einstein condensates (BECs), which have a spatially modulated scattering length, we study the existence and st…