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Propagation of the October/November 2003 CMEs through the heliosphere
Liu, Y.; Wang, C.; Richardson, J. D. +1 more
The solar storms of late October, early November 2003 generated many ICMEs. The Wind, ACE, Ulysses, Cassini, Voyager 2, and Voyager 1 spacecraft are distributed throughout the heliosphere and observe the effects of these ICMEs. We investigate whether these ICMEs form a global merged interaction region. WIND, ACE, and IMP 8 data are combined to pro…
Space Telescope Imaging Spectrograph Ultraviolet Spectra of Large Magellanic Cloud Planetary Nebulae: A Study of Carbon Abundances and Stellar Evolution
Gilmore, Diane; Shaw, Richard A.; Stanghellini, Letizia
We acquired spectra of 24 LMC planetary nebulae (PNs) in the 1150-3000 Å range in order to determine carbon and other ionic abundances. The sample more than doubles the number of LMC PNs with high-quality UV spectra in this wavelength range and whose optical images are available in the Hubble Space Telescope archive. The Space Telescope Imaging Sp…
Absolute magnitudes for late-type dwarf stars for Sloan photometry
Bilir, S.; Karaali, S.; Tunçel, S.
We present a new formula for absolute magnitude determination for late-type dwarf stars as a function of (g-r) and (r-i) for Sloan photometry. The absolute magnitudes estimated by this approach are brighter than those estimated by colour-magnitude diagrams, and they reduce the luminosity function rather close to the luminosity function of Hipparco…
Rapid Dissipation of Primordial Gas from the AU Microscopii Debris Disk
Weinberger, Alycia J.; Redfield, Seth; Roberge, Aki +1 more
The disk around AU Microscopii, an M1 star in the β Pictoris moving group, is extraordinarily well suited for comparison with the β Pic debris disk (type A5 V). We use far-UV absorption spectroscopy of AU Mic to probe its edge-on disk for small amounts of H2, the primary constituent of gas giant planets. Our conservative upper limit on …
Interior channels in Martian valleys: Constraints on fluvial erosion by measurements of the Mars Express High Resolution Stereo Camera
Jaumann, R.; Scholten, F.; Matz, K. -D. +12 more
In High Resolution Stereo Camera (HRSC) images of the Mars Express Mission a 130 km long interior channel is identified within a 400 km long valley network system located in the Lybia Montes. Ages of the valley floor and the surroundings as derived from crater counts define a period of ~350 Myrs during which the valley might have been formed. Base…
Physical conditions in Photo-Dissociation Regions around Planetary Nebulae
Tielens, A. G. G. M.; Bernard-Salas, J.
We present observations of the infrared fine-structure lines of [Si II] (34.8 µm), [O I] (63.2 and 145.5 µm) and [C II] (157.7 µm) obtained with the ISO SWS and LWS spectrographs of nine Planetary Nebulae (PNe). These lines originate in the Photo-Dissociation Regions (PDRs) associated with the nebulae and provide useful informati…
Discovery of X-ray pulsations from IGR J16320-4751 = AX J1631.9-4752
Revnivtsev, M.; Rodriguez, J.; Lutovinov, A. +1 more
We report a discovery of strong modulations of the X-ray flux detected from IGR J16320-4751 = AX J1631.9-4752 with a period of P∼1300 s. We reanalyzed the data of an XMM-Newton ToO performed soon after the discovery of the source by INTEGRAL and found the modulation at a period of P=1309 ± 40 s with a high significance. Modulations of the source f…
Stellar Winds and Embedded Star Formation in the Galactic Center Quintuplet and Arches Clusters: Multifrequency Radio Observations
Johnson, Kelsey E.; Rodríguez, Luis F.; Goss, W. M. +1 more
A multifrequency, multiconfiguration study has been made of the compact radio sources in the Galactic center Quintuplet and Arches stellar clusters using the Very Large Array. Ten radio sources have been detected in the Quintuplet cluster. The majority of these radio sources have rising spectral indices and are positionally coincident with young m…
The nature of the X-ray halo of the plerion G21.5-0.9 unveiled by XMM-Newton and Chandra
Bocchino, F.; Bandiera, R.; van der Swaluw, E. +1 more
The nature of the radio-quiet X-ray halo around the plerionic supernova remnant G21.5-0.9 is under debate. On the basis of spatial and spectral analysis of a large Chandra and XMM-Newton dataset of this source, we have developed a self-consistent scenario which explains all the observational features. We found that the halo is composed by diffuse …
A homogeneous set of globular cluster relative distances and reddenings
Salaris, M.; Recio-Blanco, A.; Zoccali, M. +6 more
We present distance modulus and reddening determinations for 72 Galactic globular clusters from the homogeneous photometric database of Piotto et al. ([CITE]), calibrated to the HST flight F439W and F555W bands. The distances have been determined by comparison with theoretical absolute magnitudes of the ZAHB. For low and intermediate metallicity c…