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Clarification of the Nature of the Galaxy [CFC97] Cen 05
Da Costa, G. S.; Jerjen, H.; Bouchard, A.
The galaxy [CFC97] Cen 05 has in the past been considered an H I-rich dwarf galaxy in the nearby Centaurus A group. We have used Australia Telescope Compact Array observations to show that the H I associated with [CFC97] Cen 05 by Côté et al. is most likely a Galactic high-velocity cloud that is centered ~17' from the optical image of the galaxy. …
Light variations of massive stars (α Cyg variables). XIX. The late-type supergiants R 59, HDE 268822, HDE 269355, HDE 269612 and HDE 270025 in the LMC
Sterken, C.; van Genderen, A. M.; Jones, A. F.
We present and discuss VBLUW photometry (Walraven system) of five supergiants in the LMC. For one well-known variable, the hypergiant R 59 = HDE 268757 (G7 Ia+) also Hipparcos photometry and numerous visual observations are available. The second variable is HDE 269612 (F0 Ia), and a third one is HDE 268822 (F6 Ia). Two F6 Ia supergiants…
The Additional Line Component within the Iron Kα Profile in MCG -6-30-15: Evidence for Blob Ejection?
Qu, Jin-Lu; Wang, Jian-Min; Xue, Sui-Jian
The EPIC data of MCG -6-30-15 observed by XMM-Newton were analyzed for the complexities of the iron Kα line. Here we report that the additional line component (ALC) at 6.9 keV undoubtedly appears within the broad iron Kα line profile at the high state, whereas it disappears at the low state. These state-dependent behaviors exclude several possible…
Far Ultraviolet Spectroscopic Explorer Spectroscopy of the Transitional Magnetic Cataclysmic Variable V405 Aurigae
Sing, David K.; Szkody, Paula; Howell, Steve B. +1 more
We present Far Ultraviolet Spectroscopic Explorer (FUSE) observations of the magnetic cataclysmic variable V405 Aurigae. Together with four other DQ Her-type binaries, V405 Aur forms a small subclass of intermediate polars that are likely to evolve into low magnetic field strength polars, similar to AM Her. Our co-added FUSE spectrum exhibits broa…
Cassini/Huygens flyby of the Jovian system
Lebreton, Jean-Pierre; Matson, Dennis L.; Spilker, Linda J. +2 more
This is an introduction to the series of 15 papers that follow. These report scientific results from the fields-and-particles instruments on Cassini/Huygens. For these works, their data acquisition started as early as 16 months before the passage by Jupiter and, for some, continued up to the approach to Saturn. The flyby of Jupiter provided a grav…
Multi-Wavelength Analysis of the 29 September 2002 M2.6/2N Flare
Dzifčáková, Elena; Karlický, Marian; Kulinová, Alena +1 more
Using TRACE EUV 171 Å line, Hα line, Zürich radio, RHESSI, and HXRS observations the 29 September 2002 flare (M2.6), which occurred in AR NOAA 0134, was analyzed. Flaring structures were compared with a potential magnetic field model (field lines and quasi-separatrix layers) made from SOHO/MDI full-disk magnetogram. Series of high-resolution SOHO/…
Radio and multiwavelength evidence of coronal loop eruption in a flare-coronal mass ejection event on 15 April 1998
Huang, Guang-Li
A typical flare-coronal mass ejection (CME) event is studied at the initial time and position of the flare and CME. The photospheric magnetic configuration consists of two main polarities (dipolar structure) with some emerged new polarities, similar to a quadrupolar structure, during the event. The coronal loops in soft X-ray and EUV images show t…
The Status of ROSAT X-ray Active Young Stars toward Taurus-Auriga
Li, Jin-Zeng
We present an astrometric study of the candidates of T Tauri stars (TTS) and non-TTS X-ray sources around Tau-Aur, based on the Hipparcos Catalogue and the ACT Reference Catalogue. The ROSAT selected X-ray sources are found to be a mixed population. A few of them are associated with the Tau-Aur or Orion Star Forming Regions (SFR). Some, with dista…
Accretion Processes in Mira AB
Raymond, J. C.; Marengo, M.; Karovska, M. +3 more
The Mira AB interacting binary provides an ideal laboratory for studying mass loss and accretion processes in systems containing an AGB star and a compact accretor, because its components have been resolved and can be studied individually. We present here results from our long term study of accretion processes in this system. These include recent …
A ULX in NGC 4559: a ``mini-cartwheel'' scenario?
Soria, R.; Cropper, M. S.; Pakull, M. W.
We have studied the peculiar environment around a ULX in NGC 4559 (with L[x] ≈ 2×1040 erg s-1 and M[BH] ≳ 50M⊙). The X-ray source is located near the rim of a young (age < 30 Myr), large (diameter ≈ 700 pc) ring-like star forming complex possibly triggered by the impact of a dwarf satellite galaxy through the gas-rich oute…