First Results of the 17th DSN Campaign: Photometry of XX Pyx

2000 ◽  
Vol 176 ◽  
pp. 469-470
Author(s):  
T. Arentoft ◽  
G. Handle ◽  
R. R. Shobbrook ◽  
M. A. Wood ◽  
L. Crause ◽  
...  
Keyword(s):  
Time Series ◽  
Amplitude Spectrum ◽  
Detection Level ◽  
First Results ◽  
Scuti Star ◽  
Delta Scuti

AbstractWe present the first results from multi-site observations of the δ Scuti star XX Pyx (CD–24°7599). The observations were carried out as the 17th run of the Delta Scuti Network. We collected 583 hr of B, V time-series photometry, resulting in a detection level (4σ) in the amplitude spectrum of 0.5 mmag. We detect 6 new pulsation frequencies, bringing the total number of frequencies known in this star up 19.

Data Fusion of Total Solar Irradiance Composite Time Series Using 40 years of Satellite Measurements: First Results 

2021 ◽  
Author(s):  
Jean-Philippe Montillet ◽  
Wolfgang Finsterle ◽  
Werner Schmutz ◽  
Margit Haberreiter ◽  
Rok Sikonja
Keyword(s):  
Time Series ◽  
Data Fusion ◽  
Solar Irradiance ◽  
Total Solar Irradiance ◽  
Maunder Minimum ◽  
The Sun ◽  
Climate Reconstructions ◽  
The Earth ◽  
First Results ◽  
The Difference

<p><span>Since the late 70’s, successive satellite missions have been monitoring the sun’s activity, recording total solar irradiance observations. These measurements are important to estimate the Earth’s energy imbalance, </span><span>i.e. the difference of energy absorbed and emitted by our planet. Climate modelers need the solar forcing time series in their models in order to study the influence of the Sun on the Earth’s climate. With this amount of TSI data, solar irradiance reconstruction models  can be better validated which can also improve studies looking at past climate reconstructions (e.g., Maunder minimum). V</span><span>arious algorithms have been proposed in the last decade to merge the various TSI measurements over the 40 years of recording period. We have developed a new statistical algorithm based on data fusion.  The stochastic noise processes of the measurements are modeled via a dual kernel including white and coloured noise.  We show our first results and compare it with previous releases (PMOD,ACRIM, ... ). </span></p>

The unusual Delta Scuti star θ2 Tau

2008 ◽  
pp. 122-125
Author(s):  
Michel Breger ◽  
E. Antonello ◽  
L. Mantegazza ◽  
Huang Lin ◽  
Jiang Shi-yang ◽  
...  
Keyword(s):  
Scuti Star ◽  
Delta Scuti Star ◽  
Delta Scuti

scholarly journals The Whole Earth Telescope: An International Adventure in Asteroseismology

2001 ◽  
Vol 183 ◽  
pp. 3-12
Author(s):  
Steven D. Kawaler
Keyword(s):  
Time Series ◽  
Global Networks ◽  
Pulsating Stars ◽  
New Science ◽  
Delta Scuti ◽  
Stellar Seismology ◽  
Ap Stars ◽  
Scuti Stars ◽  
Whole Earth

AbstractToday, we are beginning to probe the interior of stars through the new science of stellar seismology. Certain stars, ranging from our own Sun to white dwarfs, undergo natural vibrations that can be detected with sensitive time-series photometry and/or spectroscopy. Since the signal we seek is an unbroken time-series to allow determination of the vibration frequencies, data from a single-site is usually incapable of uniquely identifying the pulsation modes, no matter how large the telescope being used. In many cases, the observational goals can be achieved using small-ish telescopes in well-coordinated global networks. Here, I briefly describe the work of one such international network of observatories and scientists known as the Whole Earth Telescope (WET). With the WET, we have sounded out the interiors of a large number of nonradially pulsating stars. Over the past 14 years, WET has observed dozens of stars in 20 separate observing campaigns. Our team has wide span of interests, and has observed several other classes of objects such as delta Scuti stars, CV stars, pulsating sdB stars, and rapidly oscillating Ap stars.

scholarly journals The Delta Scuti Star GX Pegasi: A Theoretical Investigation of its Power Spectrum

1993 ◽  
Vol 134 ◽  
pp. 181-183
Author(s):  
E. Michel ◽  
M. J. Goupil ◽  
Y. Lebreton ◽  
A. Baglin
Keyword(s):  
Power Spectrum ◽  
Theoretical Investigation ◽  
Main Sequence ◽  
Main Sequence Star ◽  
Mode Identification ◽  
Star Models ◽  
Convective Core ◽  
Scuti Star ◽  
Delta Scuti Star ◽  
Delta Scuti

Target of a STEPHI multisite campaign, the Delta Scuti star GX Pegasi has been found to oscillate with at least five simultaneous, close frequencies (table I).Mode identification together with informations about the star that such an identification can provide are outlined below (see also Michel et al, 1992b).The mode identification is carried out by means of a comparison between the observed frequencies and the adiabatic frequencies of models appropriate to this star. Models that match GX Peg’s position in a Hertzsprung-Russell diagram have masses in the range 1.9 – M⊙. When included, convective core overshoot is handled as in Maeder and Meynet (1989). According to these models, GX Peg is a rather evolved, main sequence star.

scholarly journals Photometry of the δ Scuti Star DG Leo: Preliminary Results

2004 ◽  
Vol 191 ◽  
pp. 73-74 ◽  
Author(s):  
P. Lampens ◽  
R. Garrido ◽  
L. Parrao ◽  
J.H. Peña ◽  
T. Arentoft ◽  
...  
Keyword(s):  
Orbital Period ◽  
Noise Level ◽  
Amplitude Spectrum ◽  
Slow Variation ◽  
Photoelectric Photometry ◽  
Period Analysis ◽  
Preliminary Results ◽  
Spectroscopic Binary ◽  
Scuti Star ◽  
Triple Star

AbstractNew uvby photoelectric photometry has been acquired for the triple star DG Leo at two different observatories equipped with analogous instrumentation. A preliminary period analysis indicates the presence of at least 3 close δ Scuti frequencies (10-12 c/d, 3-6 mmag) and a slow variation. This slow variation fits quite well with half the orbital period of the spectroscopic binary; the noise level in the amplitude spectrum is only 3–4 mmag (after prewhitening).

Non Radial Period Structure of the Delta-Scuti Star HR1170

1980 ◽  
Vol 92 ◽  
pp. 696 ◽  
Author(s):  
J. Warman ◽  
J. H. Pena ◽  
T. E. Margrave
Keyword(s):  
Scuti Star ◽  
Delta Scuti Star ◽  
Delta Scuti

The spectral variations of the Delta Scuti star Rho Puppis

1987 ◽  
Vol 99 ◽  
pp. 425 ◽  
Author(s):  
S. Yang ◽  
G. A. H. Walker ◽  
P. Bennett
Keyword(s):  
Scuti Star ◽  
Delta Scuti Star ◽  
Delta Scuti
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