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114 papers · 2 filters
Discovery of the first tau Sco analogues: HD 66665 and HD 63425
V. Petit, D. L. Massa, W. L. F. Marcolino +3
The B0.2 V magnetic star tau Sco stands out from the larger population of massive OB stars due to its high X-ray activity, peculiar wind diagnostics and highly complex magnetic fie…
Structure and evolution of debris disks around F-type stars: I. Observations, database and basic evolutionary aspects
A. Moór, I. Pascucci, Á. Kóspál +11
Although photometric and spectroscopic surveys with the Spitzer Space Telescope increased remarkably the number of well studied debris disks around A-type and Sun-like stars, detai…
A Spitzer IRS Study of Infrared Variability in Transitional and Pre-Transitional Disks around T Tauri Stars
C. Espaillat, E. Furlan, P. D'Alessio +5
We present a Spitzer IRS study of variability in 14 T Tauri stars in the Taurus and Chamaeleon star-forming regions. The sample is composed of transitional and pre-transitional obj…
A Panchromatic View OF NGC 602: Time-Resolved Star Formation with the Hubble and Spitzer Space Telescopes
Lynn Redding Carlson, Marta Sewilo, Margaret Meixner +16
We present the photometric catalogs for the star-forming cluster NGC 602 in the wing of the Small Magellanic Cloud covering a range of wavelengths from optical HST/ACS (F555W, F814…
Multiple stellar populations in Galactic globular clusters: observational evidence
Antonino P. Milone, Giampaolo Piotto, Luigi R. Bedin +3
An increasing number of both photometric and spectroscopic observations over the last years have shown the existence of distinct sub-populations in many Galactic globular clusters…
The 2010 early outburst spectrum of the recurrent nova U Scorpii
Styliani Kafka, Robert Williams
Aims. We present optical spectra of the fast recurrent nova U Sco during its recent outburst, obtained within 24 hr of maximum light. Methods. We use medium resolution (R~4000) spe…