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The Spectral Energy Distributions of Blazars and the Connections among XBLs, RBLs, and OVV Quasars
Dai, Benzhong; Ma, Li; Xie, Guangzhong +2 more
In this paper, we introduce two composite spectral indices, αxox=αox-αx and αoro=αor-αo. In the composite color-color (αxoxαoro) diagram, there are three regions: (1) For XBLs and XBL-like RBLs, the values of αxox is in the range of -1.0 -0.0; (2) Fo…
Stellar parameters for Pop II A-type stars from IUE spectra and new-ODF ATLAS9 model atmospheres
Cacciari, C.; Castelli, F.
Stellar parameters for twenty-seven field horizontal branch A-type stars, a post-AGB star (BD +32 2188), and a possible cool sdB star (BD +00 0145) were obtained by fitting the whole IUE energy distributions taken from the IUE-INES archive to the ultraviolet energy distributions predicted by new-ODF ATLAS9 model atmospheres, which include the Lyma…
VLA Observations of Z CMa: The Orientation and Origin of the Thermal Jet
Velázquez, P. F.; Rodríguez, L. F.
We present sensitive, high angular resolution (~0.45'') Very Large Array observations made at 6 and 3.5 cm toward the thermal jet associated with the young star Z CMa. We found that the position angle of the axis of the thermal jet is coincident within error with the orientation of the optical jet and the orientation of the CO bipolar outflow. The…
Cluster boundary layer measurements and optical observations at magnetically conjugate sites
Lucek, E.; André, M.; Lybekk, B. +7 more
The Cluster spacecraft experienced several boundary layer encounters when flying outbound from the magnetosphere to the magnetosheath in the dusk sector on 14 January 2001. The dayside boundary layer was populated by magnetosheath electrons, but not with quite as high densities as in the magnetosheath itself. The Cluster ground track was calculate…
X-ray Ejecta, White-Light CMEs and a Coronal Shock Wave
Kaiser, M. L.; Gopalswamy, N.; Yashiro, S. +1 more
We report on a coronal shock wave inferred from the metric type II burst of 13 January 1996. To identify the shock driver, we examined mass motions in the form of X-ray ejecta and white-light coronal mass ejections (CMEs). None of the ejections could be considered fast (> 400 km s−1) events. In white light, two CMEs occurred in quick…
Observations of the cusp region under northward IMF
Pitout, F.; Rème, H.; Alcaydé, D. +2 more
We present a comparative study of the cusp region using the EISCAT Svalbard Radars (ESR) and the Cluster spacecraft. We focus in this paper on 2 February 2001, over the time period from 07:30 UT to 12:00 UT when the oblique ESR antenna pointing northward at a low elevation recorded latitudinal motions of the cusp region in response to the IMF. Mea…
Variable stars in the Tycho photometric observations. I. Detection
Halbwachs, J. -L.; Soubiran, C.; Fabricius, C. +3 more
We present an original way to detect variable stars in the Tycho photometric observations. A modified Kolmogorov-Smirnov statistical test has been constructed, based on a model of most of the satellite's parameters, leading to the dispersion in the measurements. This allows us to build a treatment taking into account truncated detections and censo…
A QSO survey via optical variability and zero proper motion in the M 92 field. I. QSO candidates and selection effects
Meusinger, H.; Brunzendorf, J.
The combination of variability and proper motion constraints (VPM search) is believed to provide an unconventional yet efficient search strategy for QSOs with selection effects quite different from conventional optical QSO surveys. Previous studies in a field of high galactic latitude have shown that the VPM method is indeed an efficient search st…
Crab pulsar photometry and the signature of free precession
Vidrih, S.; Carramiñana, A.; Čadež, A. +1 more
Optical photometry for the pulsar PSR 0531+21 has been extended with new observations that strengthen evidence for a previously observed 60 s periodicity. This period is found to be increasing with time at approximately the same rate as the rotational period of the pulsar. The observed period and its time dependence fit a simple free precession mo…
A Burst from the Direction of UZ Fornacis with XMM-Newton
Mukai, Koji; Still, Martin
The XMM-Newton pointing toward the magnetic cataclysmic variable UZ For finds the source to be a factor of greater than 103 fainter than previous EXOSAT and ROSAT observations. The source was not detected for the majority of a 22 ks exposure with the European Photon Imaging Cameras, suggesting that the accretion rate either decreased or…