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7 papers · 1 filter
Detection of an Extrasolar Planet Atmosphere
David Charbonneau, Timothy M. Brown, Robert W. Noyes +1
We report high precision spectrophotometric observations of four planetary transits of HD 209458, in the region of the sodium resonance doublet at 589.3 nm. We find that the photom…
Analysis of the solar cycle and core rotation using 15 years of Mark-I observations:1984-1999. I. The solar cycle
S. J. Jiménez-Reyes, T. Corbard, P. L. Pallé +2
High quality observations of the low-degree acoustic modes (p-modes) exist for almost two complete solar cycles using the solar spectrophotometer Mark-I, located at the Observatori…
Magnetic properties of photospheric regions having very low magnetic flux
H. Socas-Navarro, J. Sanchez Almeida
The magnetic properties of the quiet Sun are investigated using a novel inversion code, FATIMA, based on the Principal Component Analysis of the observed Stokes profiles. The stabi…
The Frequency of Binary Stars in the Core of 47 Tucanae
Michael D. Albrow, Ronald L. Gilliland, Timothy M. Brown +3
Differential time series photometry has been derived for 46422 main-sequence stars in the core of 47 Tucanae. The observations consisted of near-continuous 160-s exposures alternat…
Preliminary Constraints on 12C(alpha,gamma)16O from White Dwarf Seismology
T. S. Metcalfe, D. E. Winget, P. Charbonneau
For many years, astronomers have promised that the study of pulsating white dwarfs would ultimately lead to useful information about the physics of matter under extreme conditions…
HST Time-Series Photometry of the Transiting Planet of HD 209458
Timothy M. Brown, David Charbonneau, Ronald L. Gilliland +2
We have observed 4 transits of the planet of HD 209458 using the STIS spectrograph on HST. Summing the recorded counts over wavelength between 582 nm and 638 nm yields a photometri…