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A multiwavelength survey of NGC 6752: X-ray counterparts, two new dwarf novae and a core-collapsed radial profile
Maccarone, T. J.; Knigge, C.; Sarajedini, A. +6 more
We present the results of a multiwavelength (far-ultraviolet to I band) survey of the stellar populations of the globular cluster NGC 6752, using Space Telescope Imaging Spectrograph (STIS), Advanced Camera for Surveys (ACS) and Wide Field Camera 3 (WFC3) on board the Hubble Space Telescope. We have confirmed that two previously identified catacly…
Rotational periods and evolutionary models for subgiant stars observed by CoRoT⋆
do Nascimento, J. -D.; Castro, M.; da Costa, J. S.
Context. We present rotation period measurements for subgiants observed by CoRoT. Interpreting the modulation of stellar light that is caused by star-spots on the time scale of the rotational period depends on knowing the fundamental stellar parameters.
Aims: Constraints on the angular momentum distribution can be extracted from the true stel…
Decorrelation Times of Photospheric Fields and Flows
Welsch, B. T.; Kusano, K.; Yamamoto, T. T. +1 more
We use autocorrelation to investigate evolution in flow fields inferred by applying Fourier local correlation tracking (FLCT) to a sequence of high-resolution (0farcs3), high-cadence (sime 2 minute) line-of-sight magnetograms of NOAA active region (AR) 10930 recorded by the narrowband filter imager of the Solar Optical Telescope aboard the Hinode …
Multipoint study of magnetosheath magnetic field fluctuations and their relation to the foreshock
Němeček, Z.; Gutynska, O.; Šimůnek, J. +2 more
The magnetosheath is occupied with a variety of low-frequency fluctuations from different sources. Among them, the bow shock and dominantly foreshock processes are often considered as their major contributors. We use distant (Wind) and close (Geotail) interplanetary magnetic field monitors and compare their measurements with simultaneous magnetic …
X-ray spectroscopy of clusters of galaxies
Ota, Naomi
Clusters of galaxies are the most massive objects in the Universe and precise knowledge of their mass structure is important to understand the history of structure formation and constrain still unknown types of dark contents of the Universe. X-ray spectroscopy of galaxy clusters provides rich information about the physical state of hot intracluste…
3-dimensional kinematics in low foreground extinction windows of the Galactic bulge. Radial velocities for six bulge fields: procedures and results
Rich, R. M.; Soto, M.; Kuijken, K.
Aims: The detailed structure of the Galactic bulge still remains uncertain. The strong difficulties of obtaining observations of stars in the Galactic bulge have hindered the acquisition of a kinematic representation for the inner kpc of the Milky Way. The observation of the 3-d kinematics in several low foreground extinction windows can solv…
The X-ray luminous galaxies optically classified as star forming are mostly narrow line Seyfert 1 s
Ballo, L.; Barcons, X.; Carrera, F. J. +3 more
Context. The optical and ultraviolet emission lines of galaxies are widely used to distinguish star-forming (SF) galaxies from active galactic nuclei (AGNs). However, this type of diagnostic has some associated uncertainties, because AGNs can be of low luminosity and/or heavily obscured, and the optical emission lines may be dominated by a stellar…
Characterization of the X-Ray Light Curve of the γ Cas-like B1e Star HD 110432
Smith, Myron A.; Motch, Christian; Lopes de Oliveira, Raimundo
HD 110432 (BZ Cru B1Ve) is the brightest member of a small group of "γ Cas analogs" that emit copious hard X-ray flux, punctuated by ubiquitous "flares." To characterize the X-ray time history of this star, we made a series of six RXTE multi-visit observations in 2010 and an extended observation with the XMM-Newton in 2007. We analyzed these new l…
XMMU J0541.8-6659, a new supernova remnant in the Large Magellanic Cloud
Pietsch, W.; Haberl, F.; Smith, R. C. +6 more
Context. The high sensitivity of the XMM-Newton instrumentation offers the opportunity to study faint and extended sources in the Milky Way and nearby galaxies such as the Large Magellanic Cloud (LMC) in detail. The ROSAT PSPC survey of the LMC has revealed more than 700 X-ray sources, among which there are 46 supernova remnants (SNRs) and candida…
Identification of Galactic Bulge Survey X-Ray Sources with Tycho-2 Stars
Maccarone, T. J.; Torres, M. A. P.; Nelemans, G. +6 more
We identify 69 X-ray sources discovered by the Galactic Bulge Survey (GBS) that are coincident with or very close to bright stars in the Tycho-2 catalog. Additionally, two other GBS sources are resolved binary companions to Tycho-2 stars where both components are separately detected in X-rays. Most of these are likely to be real matches, but we id…