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Water in star- and planet-forming regions
van Dishoeck, E. F.; Bergin, E. A.
In this paper we discuss the astronomical search for water vapor in order to understand the disposition of water in all its phases throughout the process of star and planet formation. Our ability to detect and study water vapor has recently received a tremendous boost with the successful launch and operations of the Herschel Space Observatory. Her…
The blue straggler star population in NGC 6229
Dalessandro, E.; Sanna, N.; Beccari, G. +3 more
We have used a combination of high-resolution Hubble Space Telescope Wide Field Planetary Camera 2 and wide-field ground-based observations in ultraviolet and optical bands to study the blue straggler star (BSS) population of the outer halo globular cluster NGC 6229 over its entire radial extent. A total of 64 bright BSS (with m255≤ 21.…
Three quasi-stellar objects acting as strong gravitational lenses
Djorgovski, S. G.; Stern, D.; Faure, C. +8 more
We report the discovery of three new cases of quasi-stellar objects (QSOs) acting as strong gravitational lenses on background emission line galaxies: SDSS J0827+5224 (zQSO = 0.293, zs = 0.412), SDSS J0919+2720 (zQSO = 0.209, zs = 0.558), SDSS J1005+4016 (zQSO = 0.230, zs = 0.441). …
Changes in the magnetotail configuration before near-Earth reconnection
Gordeev, E. I.; Snekvik, K.; Østgaard, N. +4 more
We have examined three typical substorm growth phase signatures in the magnetotail two hours before near Earth reconnection; namely current sheet thinning, field line stretching and increase in the lobe magnetic pressure. The reconnection events were identified from in situ measurements in the plasma sheet by the Cluster spacecraft. The events wer…
2M1155-79 (= T Chamaeleontis B): A Low-mass, Wide-separation Companion to the nearby, "Old" T Tauri Star T Chamaeleontis
Montez, Rodolfo; Murphy, Simon J.; Kastner, Joel H. +3 more
The early-K star T Cha, a member of the nearby (D ≈ 100 pc) epsilon Cha Association, is a relatively "old" (age ~ 7 Myr) T Tauri star that is still sporadically accreting from an orbiting disk whose inner regions are now evidently being cleared by a close, substellar companion. We report the identification, via analysis of proper motions, serendip…
A Simultaneous Forbush Decrease Associated with an Earthward Coronal Mass Ejection Observed by STEREO
Yi, Y.; Oh, S. Y.
The intensity-time profile of Forbush decrease (FD) events observed by neutron monitors (NMs) looks like that of a geomagnetic storm as defined by the Dst index. Oh, Yi, and Kim (J. Geophys. Res. 113, A01103, 2008) and Oh and Yi (J. Geophys. Res. 114, A11102, 2009) classified FD events based on the amount of overlap and simultaneity of their main …
Evidence for Fresh Frost Layer on the Bare Nucleus of Comet Hale-Bopp at 32 AU Distance
Pál, András; Sárneczky, Krisztián; Juhász, Attila +4 more
Here, we report that the activity of comet Hale-Bopp ceased between late 2007 and 2009 March, at about 28 AU distance from the Sun. At that time, the comet resided at a distance from the Sun that exceeded the freeze-out distance of regular comets by an order of magnitude. A Herschel Space Observatory PACS scan was taken in mid-2010, in the already…
Herschel and JCMT observations of the early-type dwarf galaxy NGC 205
Boquien, M.; Roussel, H.; Fritz, J. +18 more
We present Herschel dust continuum, James Clerk Maxwell Telescope CO (3-2) observations and a search for [C II] 158 ?m and [O I] 63 ?m spectral line emission for the brightest early-type dwarf satellite of Andromeda, NGC 205. While direct gas measurements [Mg∼ 1.5 × 106 M⊙, H I+ CO (1-0)] have proven to be inconsis…
The XMM-Newton survey of the Small Magellanic Cloud: XMMU J010633.1-731543 and XMMU J010743.1-715953, two new Be/X-ray binary systems★
Haberl, F.; Hatzidimitriou, D.; Mereghetti, S. +6 more
In the course of the XMM-Newton survey of the Small Magellanic Cloud (SMC), two new bright X-ray sources were discovered exhibiting the spectral characteristics of high-mass X-ray binaries - but revealing only weak evidence for pulsations in just one of the objects (at 153 s in XMMU J010743.1-715953). The accurate X-ray source locations permit the…
Ultraviolet Measurements of Interstellar C2
Federman, S. R.; Sheffer, Y.; Hupe, Ryan C.
We analyzed archival spectra acquired with the Hubble Space Telescope for a study of interstellar C2. Absorption from the electronic transitions, D 1Σ+ u - X 1Σ+ g (0,0) as well as F 1Πu - X 1Σ+ g (0,0) and (1,0), was…