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Chapter and Conference Paper
An HST Study of Star Formation in Star-Burst Clusters
Using the Hubble Space Telescope, we have undertaken a systematic study of pre main sequence (PMS) stars spanning a wide range of masses ...
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Chapter and Conference Paper
Stellar Populations in the Super Star Clusters NGC 3603 and 30 Doradus
We highlight the main results of a multi-wavelenght study of the super star clusters NGC 3603 and 30 Doradus, recently observed with Wide Field Camera 3 (WFC3) on board the HST.
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Chapter and Conference Paper
A Hubble View of Star Forming Regions in the Magellanic Clouds
The Magellanic Clouds (MCs) offer an outstanding variety of young stellar associations, in which large samples of low-mass stars (with M≲1 M⊙ currently in the act of formation can be resolved and explored in deta...
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Chapter and Conference Paper
A Decade of Radio and X-ray Observations of SN 1993J
We review ten years of radio continuum and X-ray monitoring of the Type IIb SN 1993J in M81. The supernova (SN) has been observed continuously, since only a few days after explosion, by our group with the Very...
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Chapter and Conference Paper
Detecting Primordial Stars
We discuss the expected properties of the first stellar generations in the Universe. We find that it is possible to discern truly primordial populations from the next generation of stars by measuring the metal...
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Chapter and Conference Paper
Exploring the Reionization Epoch with HST and JWST
We discuss the detectability of the sources responsible for reionization with existing and planned telescopes. Our approach is based on the number of UV photons required for reionization and depends on relativ...
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Chapter and Conference Paper
The Initial Conditions Tostar Formation: Lowmass Stars at Lowmetallicity
We have measured the present accretion rate of roughly 800 low-mass (∼ 1 . 1.4 M⊙) pre-Main Sequence stars in the field of SN 1987A in the Large Magellanic Cloud.
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Chapter and Conference Paper
A Geometric Determination of the Distance to SN 1987A and the LMC
Using the definitive reductions of the IUE light curves by [15] and an extensive set of HST images of SN 1987A we have repeated and improved our original analysis [8, 9] to derive a better determination of the di...
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Chapter and Conference Paper
Radio Monitoring of Supernova 2001ig: The First Year
Supernova 2001ig in NGC 7424 has been observed with the Australia Telescope Compact Array at ∼2 week intervals since its discovery, making this the best-studied Type IIb radio supernova since SN 1993J.We prese...
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Chapter and Conference Paper
Radio Supernovae
Detailed, multi-frequency radio observations of supernovae have shown that the radio emission can be understood as a blastwave interacting with a structured circumstellar medium (CSM) and modeling of the radio...
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Chapter and Conference Paper
T Tauri Stars in the Large Magellanic Cloud: A Combined HST and VLT Effort
The combination of the unprecedented spatial resolution attainable with WFPC2 on board HST and of the large collecting area of the VLT makes it possible to study in detail the low mass pre-Main Sequence stars ...
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Chapter and Conference Paper
T Tauri Stars in the Large Magellanic Cloud: A Combined HST and VLT Effort
The combination of the unprecedented spatial resolution attainable with WFPC2 on board HST and of the large collecting area of the VLT makes it possible to study in detail the low mass pre-Main Sequence stars ...
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Chapter and Conference Paper
IUE Observations of Supernovae
The launch of the International Ultraviolet Explorer (IUE) satellite in early 1978 marked the beginning of a new era for SN studies because of its capability of measuring the ultraviolet emission of objects as...
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Chapter and Conference Paper
A Supernova with a Difference, SN 1986J
A new radio source was discovered on 21 August 1986 by VAN GORKOM et al. [1] during their study of the nearby, edge-on, spiral galaxy NGC891. Because the source lay in the disk and had HI absorption features c...
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Chapter and Conference Paper
On the Nature of Type Ib Supernova Progenitors
The realization that there is a separate subclass of Type I supernovae (SNe) to be denoted as Type Ib came after the detailed study of the SN 1983N in M83 (PANAGIA et al [1]; see also PANAGIA [2], WHEELER and LEV...
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Chapter and Conference Paper
A Third, Inner Light Echo Ring Around SN 1987A
At the beginning of this year evidence has been found for a third, inner echo near SN 1987A (BOND et al. [l]). This discovery is of great importance because the detection of an echo so close to the SN 1987A revea...
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Chapter and Conference Paper
Type Ib supernovae: What they may be and what they are not
We show that the progenitors of Type Ib supernovae are likely to be moderately massive stars (M ∼ 7 M⊙) in binary systems and we argue that the hypothesis that they originate from very massive stars (M > 20 M⊙) i...
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Chapter and Conference Paper
Ultraviolet observations of SN 1987A
The results of IUE observations of- SN 1987A are presented and discussed. One of the most important conclusions is that the direct progenitor of the supernova was a blue supergiant (Sk -69 202) that, however, ...
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Chapter and Conference Paper
Multifrequency observations of recent supernovae
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Chapter and Conference Paper
The Properties of Dust in Planetary Nebulae
We present and discuss the properties of dust grains mixed with the ionized gas in planetary nebulae.