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Analysing the Hipparcos epoch photometry of λ Bootis stars
Paunzen, E.; Reegen, P.
We performed a homogeneous analysis of the available Hipparcos epoch photometry for all members of the LB group. Besides the known δ Scuti like pulsation frequencies, we searched for eclipses due to binarity or rotational induced variability. The already known frequencies of HD 15165 are confirmed with an additional lower single frequency, which m…
Coronal mass ejections acceleration problem
Wen, Yayuan; Wang, Jingxiu; Zhao, Hui +1 more
A statistical study of acceleration and its error of coronal mass ejections (CMEs) observed by the Large Angle Spectrometric Coronagraph (LASCO) is performed. A total of 5594 CMEs events have been analyzed by using a least-square method and using the error in the height measures. We verify that slower CMEs (velocities in the interval from 200 to 5…
Solar-like stars as seen by CoRoT
Auvergne, M.; Baudin, F.; Michel, E. +7 more
For more than a year, photometric high-quality data have been achieved from the CoRoT (COnvection ROtation and Planetary Transits; Baglin et al. 2006, Michel et al. 2008) min- isatellite developed by the French space agency (CNES) in collaboration with the Science Program of ESA, Austria, Belgium, Brazil Germany and Spain. The power spectrum of 4 …
Emission Line Imaging Spectroscopy for Diagnosing of Solar Outer Atmospheres
Watanabe, Tetsuya; EIS Team
The Extreme Ultraviolet Imaging Spectrometer on board the Japanese Sun Observing Satellite “Hinode” realizes the highest sensitivity ever achieved in the two EUV wavelengths of 17-21 nm and 25-29 nm. EIS will be able to provide the detailed diagnostic information on solar corona and transition region. A new tool of timedependent collisonal-radiati…
Periodicity search for possible X-ray counterparts to radio-quiet gamma-ray pulsar candidates
Chang, Hsiang-Kuang; Lin, Lupin Chun-Che
A periodicity search of gamma-ray data is usually difficult because of the small number of detected photons. A periodicity in the timing signal at other energy bands from the counterpart to the gamma-ray source may help to establish the periodicity in the gamma-ray emission and strengthen the identification of the source in different energy bands.…
Quantifying and containing the curse of high resolution coronal imaging
Delouille, V.; Hochedez, J. -F.; Chainais, P.
Future missions such as Solar Orbiter (SO), InterHelioprobe, or Solar Probe aim at approaching the Sun closer than ever before, with on board some high resolution imagers (HRI) having a subsecond cadence and a pixel area of about (80 km)2 at the Sun during perihelion. In order to guarantee their scientific success, it is necessary to ev…
Circumnuclear Star Forming Activity in NGC 3982
Gu, Qiu-Sheng; Wang, Yi-Peng; Zhang, Shui-Nai
We present a study of the nearby Seyfert galaxy NGC 3982 using optical, infrared and X-ray data acquired by SDSS, Spitzer and Chandra. Our main results are as follows: (1) A simple stellar population synthesis on the nuclear and circumnuclear SDSS spectra gives unambiguous evidence of young stellar components in both the nuclear and circumnuclear …
A scientific case for XMM-Newton continuation
McBreen, B.; Schartel, N.
The presentations made at the workshop ``XMM-Newton: The Next Decade'', held at ESAC from 4th to the 6th of July 2007, contained an overwhelming amount of new results and well justified scientific questions that can be addressed by observations with XMM-Newton. XMM-Newton has over the next decade a solid scientific case. Given the high impact of X…
Surveys on magnetospheric plasmas based on the Double Star Project (DSP) exploration
Escoubet, C. P.; Dandouras, I.; Reme, H. +11 more
The equatorial and polar satellites of the Double Star Project (DSP) were launched successfully on December 29, 2003 and July 25, 2004, respectively, and both of them are operating smoothly. The DSP provides a good opportunity for investigating the structure of the magnetosphere. Based on the DSP data collected during 2004, we have surveyed the di…
Is the Optically Unidentified Radio Source FIRST J121839.7+295325 a Dark Lens?
Keeton, C. R.; Ryan, R. E., Jr.; Windhorst, R. A. +2 more
We present evidence that the optically unidentified radio source FIRST J121839.7+295325 may be strongly lensing a background galaxy. We estimate the redshift of the assumed gravitational arc, discovered in parallel imaging with HST, from MMT-Blue Channel spectroscopy to be zarc = 2.48-0.05+0.14. We present lens mod…