scholarly journals Recent Hubble Space Telescope Observations of SN 1987A: Broad Emission Lines

2013 ◽  
Vol 9 (S296) ◽  
pp. 1-8
Author(s):  
Kevin France
Keyword(s):  
Shock Front ◽  
Hubble Space Telescope ◽  
Neutral Hydrogen ◽  
Maximum Velocity ◽  
Physical Structure ◽  
Late Time ◽  
Reverse Shock ◽  
Chemical Abundances ◽  
Space Telescope ◽  
Sn 1987A

AbstractObservations with the Hubble Space Telescope (HST), conducted since 1990, have allowed us to create a “movie” of the evolution of the core-collapse supernova SN 1987A from 3–25 years after the explosion. Critical to understanding the late time evolution of SN 1987A was the successful HST Servicing Mission 4 in May 2009. The repair of the STIS instrument and the installation of the WFC3 imager and COS spectrograph have provided crucial data points for understanding the temporal variability in the physical structure and energy sources for SN 1987A, as well as measurements of the chemical abundances of the ejecta. In this proceeding, I will focus on two topics that have made use of the expanded capability of HST and highlight the importance of access to a UV/optical space observatory for the studies of local supernovae: 1) 2) The decreasing maximum velocity of neutral hydrogen crossing the reverse shock front and the role of soft X-ray/EUV heating in the outer supernova debris and 2) The detection of metals (N4+ and C3+ ions) crossing the reverse shock front and CNO processing in the progenitor star.

scholarly journals Modelling the Late-time Hubble Space Telescope Imaging of the Outburst of the Recurrent Nova RS Ophiuchi (2006)

2012 ◽  
Vol 8 (S290) ◽  
pp. 137-140
Author(s):  
Valério A. R. M. Ribeiro ◽  
Michael F. Bode ◽  
Robert Williams
Keyword(s):  
High Velocity ◽  
Linear Expansion ◽  
Hubble Space Telescope ◽  
Archival Data ◽  
Late Time ◽  
Low Velocity ◽  
Space Telescope ◽  
Two Component ◽  
Recurrent Nova ◽  
Dumbbell Structure

AbstractThe nebular remnant of RS Ophiuchi was modelled using combined HST/ACS imaging and ground-based spectroscopy on day 155 after outburst as a two component bipolar expansion with a low velocity innermost hour-glass over density and a more extended high velocity dumbbell structure. The model was evolved to a much later date, day 455 after outburst, when second epoch HST images were secured. However, due to the lack of simultaneous ground-based spectroscopy the evolved model was much harder to constrain. One suggestion put forward was that the dumbbell structure expanded linearly while the inner hour-glass showed signs of deceleration. Archival data in the form of ground-based spectroscopy on day 415 were subsequently obtained. These new data suggest indeed that a non-linear expansion of the system occurred.

A Search for a Pulsar in the Remnant of SN 1987A with the Hubble Space Telescope High-Speed Photometer

1995 ◽  
Vol 446 ◽  
pp. 832 ◽  
Author(s):  
J. W. Percival ◽  
P. T. Boyd ◽  
J. D. Biggs ◽  
J. F. Dolan ◽  
R. C. Bless ◽  
...  
Keyword(s):  
High Speed ◽  
Hubble Space Telescope ◽  
Space Telescope ◽  
Sn 1987A

scholarly journals The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters – XIX. A chemical tagging of the multiple stellar populations over the chromosome maps

2019 ◽  
Vol 487 (3) ◽  
pp. 3815-3844 ◽  
Author(s):  
A F Marino ◽  
A P Milone ◽  
A Renzini ◽  
F D’Antona ◽  
J Anderson ◽  
...  
Keyword(s):  
Globular Clusters ◽  
Hubble Space Telescope ◽  
Empirical Relation ◽  
Light Element ◽  
Stellar Populations ◽  
Type I ◽  
Type Ii ◽  
Chemical Abundances ◽  
Space Telescope ◽  
Galactic Globular Clusters

Abstract The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters (GCs) has investigated GCs and their stellar populations. In previous papers of this series we have introduced a pseudo two-colour diagram, or ‘chromosome map’ (ChM) that maximizes the separation between the multiple populations. We have identified two main classes of GCs: Type I, including ∼83 per cent of the objects, and Type II clusters. Both classes host two main groups of stars, referred to in this series as first (1G) and second generation (2G). Type II clusters host more complex ChMs, exhibiting two or more parallel sequences of 1G and 2G stars. We exploit spectroscopic elemental abundances from the literature to assign the chemical composition to the distinct populations as identified on the ChMs of 29 GCs. We find that stars in different regions of the ChM have different compositions: 1G stars share the same light-element content as field stars, while 2G stars are enhanced in N and Na and depleted in O. Stars with enhanced Al, as well as stars with depleted Mg, populate the extreme regions of the ChM. We investigate the intriguing colour spread among 1G stars observed in many Type I GCs, and find no evidence for internal variations in light elements among these stars, whereas either a ∼0.1 dex iron spread or a variation in He among 1G stars remains to be verified. In the attempt of analysing the global properties of the multiple-population phenomenon, we have constructed a universal ChM, which highlights that, though very variegate, the phenomenon has some common pattern among all the analysed GCs. The universal ChM reveals a tight connection with Na abundances, for which we have provided an empirical relation. The additional ChM sequences observed in Type II GCs are enhanced in metallicity and, in some cases, s-process elements. Omega Centauri can be classified as an extreme Type II GC, with a ChM displaying three main extended ‘streams’, each with its own variations in chemical abundances. One of the most noticeable differences is found between the lower and upper streams, with the latter, associated with higher He, being also shifted towards higher Fe and lower Li abundances. We publicly release the ChMs.

scholarly journals Hubble Space Telescope Observations of the SN 1987A Triple Ring Nebula

1995 ◽  
Vol 452 ◽  
pp. 680 ◽  
Author(s):  
Christopher J. Burrows ◽  
John Krist ◽  
J. Jeff Hester ◽  
Raghvendra Sahai ◽  
John T. Trauger ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Space Telescope ◽  
Sn 1987A ◽  
Ring Nebula

scholarly journals The Matter Beyond the Ring: The Recent Evolution of SN 1987A Observed by the Hubble Space Telescope

2019 ◽  
Vol 886 (2) ◽  
pp. 147 ◽  
Author(s):  
J. Larsson ◽  
C. Fransson ◽  
D. Alp ◽  
P. Challis ◽  
R. A. Chevalier ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Space Telescope ◽  
Sn 1987A

scholarly journals Late-time Hubble Space Telescope Observations of a Hydrogen-poor Superluminous Supernova Reveal the Power-law Decline of a Magnetar Central Engine

2021 ◽  
Vol 921 (1) ◽  
pp. 64
Author(s):  
Peter K. Blanchard ◽  
Edo Berger ◽  
Matt Nicholl ◽  
Ryan Chornock ◽  
Sebastian Gomez ◽  
...  
Keyword(s):  
Power Law ◽  
Hubble Space Telescope ◽  
Late Time ◽  
Space Telescope ◽  
Central Engine

Late-time spectra and type IA supernova models: New clues from the Hubble Space Telescope

1995 ◽  
Vol 439 ◽  
pp. 60 ◽  
Author(s):  
P. Ruiz-Lapuente ◽  
R. P. Kirshner ◽  
M. M. Phillips ◽  
P. M. Challis ◽  
B. P. Schmidt ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Late Time ◽  
Space Telescope ◽  
Type Ia Supernova ◽  
Type Ia

Properties of Star 2, One of the SN 1987A Companions, Derived from Hubble Space Telescope--Faint Object Spectrograph Observations

1996 ◽  
Vol 465 ◽  
pp. 956 ◽  
Author(s):  
S. Scuderi ◽  
N. Panagia ◽  
R. Gilmozzi ◽  
P. M. Challis ◽  
R. P. Kirshner
Keyword(s):  
Hubble Space Telescope ◽  
Space Telescope ◽  
Sn 1987A ◽  
Faint Object ◽  
Faint Object Spectrograph

scholarly journals SN 1987A Deconvolved by Mim

1993 ◽  
Vol 155 ◽  
pp. 411-411
Author(s):  
H. Gratl ◽  
J. Pfleiderer
Keyword(s):  
Hubble Space Telescope ◽  
Expansion Velocity ◽  
Deconvolution Method ◽  
Minimum Information ◽  
Space Telescope ◽  
Sn 1987A ◽  
Local Smoothness ◽  
Smoothness Constraint ◽  
Information Method ◽  
Blurred Images

Modelling of PNs from blurred images, as from the Hubble Space Telescope, needs good deconvolution, and the better that is, the more reliable are the results. As an example, we have MIM-deconvolved the HST image of SN 1987A taken in August 1990 by the FOC in [O III] λ5007 Å (F501N). MIM (minimum information method) is a linear deconvolution method with a local smoothness constraint (Pfleiderer 1991). Our results are similar to those already published (Jakobson et al. 1991, Panagia et al. 1991) but we were able to decrease some of the uncertainties. The ring, centered on the SN, has diameter 1680 ± 20 mas (≡ 1.3 ly) and tilt 44.5°±1.5° (Fig 1.). The lumps deviate from the ellipse by up to ≤ 0.05 ly, the ratio of brightest to faintest knots being ≈ 10 (Fig.3). The SN is resolved (Fig.2), being not a uniformly illuminated disk but brighter in the center. Its FWHM is 100 ± 10 mas, i.e. an average expansion velocity since the explosion of v ≈ 3 500 km s−1.

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