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6 papers · 1 filter
The pulsating hot subdwarf Balloon 090100001: results of the 2005 multisite campaign
A. Baran, R. Oreiro, A. Pigulski +28
We present the results of a multisite photometric campaign on the pulsating sdB star Balloon 090100001. The star is one of the two known hybrid hot subdwarfs with both long- and sh…
Integral Field Spectroscopy of HH 262: The Spectral Atlas
R. Lopez, B. Garcia-Lorenzo, S. F. Sanchez +3
HH 262 is a group of emitting knots displaying an "hour-glass" morphology in the Halpha and [SII] lines, located 3.5' to the northeast of the young stellar object L1551-IRS5, in Ta…
Neon and Chemical Fractionation Trends in Late-type Stellar Atmospheres
D. Garcia-Alvarez, J. J. Drake, P. Testa
A survey of Ne, O and Fe coronal abundances culled from the recent literature for about 60 late-type stars confirms that the Ne/O ratio of stellar outer atmospheres is about two ti…
Structural and compositional properties of brown dwarf disks: the case of 2MASS J04442713+2512164
H. Bouy, N. Huelamo, C. Pinte +15
In order to improve our understanding of substellar formation, we have performed a compositional and structural study of a brown dwarf disk. We present the result of photometric, s…
Proper motion Pleiades candidate L-type brown dwarfs
G. Bihain, R. Rebolo, V. J. S. Bejar +3
We present results of an optical and near-infrared (IR) 1.8 deg^2 survey in the Pleiades open cluster to search for substellar objects. From optical I-band images from the CFHT and…
Chemical Abundances and Ionizing Clusters of HII Regions in the LINER Galaxy NGC 4258
Angeles I. Diaz, Marcelo Castellanos, Elena Terlevich +1
We present long-slit observations in the optical and near infrared of eight HII regions in the spiral galaxy NGC 4258. Six of the observed regions are located in the SE inner spira…