scholarly journals [ITAL]Hubble Space Telescope[/ITAL] WFPC2 Proper Motions in Two Bulge Fields: Kinematics and Stellar Population of the Galactic Bulge

2002 ◽  
Vol 124 (4) ◽  
pp. 2054-2066 ◽  
Author(s):  
Konrad Kuijken ◽  
R. Michael Rich
Keyword(s):  
Stellar Population ◽  
Hubble Space Telescope ◽  
Proper Motions ◽  
Galactic Bulge ◽  
Space Telescope

scholarly journals Hubble Space Telescope observations of Baade's window

1993 ◽  
Vol 153 ◽  
pp. 289-290
Author(s):  
W. A. Baum ◽  
R. M. Light ◽  
J. Holtzman ◽  
D. Hunter ◽  
T. Kreidl ◽  
...  
Keyword(s):  
Stellar Population ◽  
Hubble Space Telescope ◽  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Status Report ◽  
Wide Field ◽  
Galactic Bulge ◽  
Space Telescope ◽  
The Mean

This is a status report on a continuing program using the Hubble Space Telescope (HST) Wide–Field Camera (WFC) to probe the stellar population of the Galactic bulge to fainter magnitudes. We seek the mean age of the stars and the initial mass function (IMF). Galactic bulge stars offer the only opportunity to investigate the IMF of a super metal–rich population. They are 100 times closer than the next nearest sample.

scholarly journals Measuring proper motions of galactic dwarf galaxies with Hubble Space Telescope

2007 ◽  
Vol 3 (S248) ◽  
pp. 244-247 ◽  
Author(s):  
S. Piatek ◽  
C. Pryor
Keyword(s):  
Research Group ◽  
Dwarf Galaxies ◽  
Hubble Space Telescope ◽  
Proper Motions ◽  
Future Directions ◽  
Space Telescope ◽  
The Past ◽  
Scientific Justification ◽  
Satellite Galaxies ◽  
Using Data

AbstractOver the past several years, our research group has been measuring proper motions for nearby dwarf satellite galaxies using data taken with the Hubble Space Telescope. In order to measure proper motions with an expected size of several tens of milliarcseconds per century using a time baseline of 2-4 years, our work required that positions of stars and QSOs be measured to an accuracy of ~0.25 mas (~0.005 pixel). This contribution reviews the scientific justification of this work and our methodology. It concludes with a few general results and future directions.

Internal kinematics of multiple stellar populations in globular clusters

2019 ◽  
Vol 14 (S351) ◽  
pp. 324-328
Author(s):  
Mattia Libralato
Keyword(s):  
High Precision ◽  
Globular Clusters ◽  
Hubble Space Telescope ◽  
Stellar Populations ◽  
Stellar Systems ◽  
Proper Motions ◽  
Space Telescope ◽  
Formation And Evolution ◽  
Galactic Globular Clusters ◽  
Shed Light

AbstractSpectroscopy and photometry have revealed existence, complexity and properties of the multiple stellar populations (mPOPs) hosted in Galactic globular clusters. However, the conundrum of the formation and evolution of mPOPs is far from being completely exploited: the available pieces of information seem not enough to shed light on these topics. Astrometry, and in particular high-precision proper motions, can provide us the sought-after answers about how mPOPs formed and have evolved in these ancient stellar systems. In the following, I present a brief overview of the observational results on the internal kinematics of the mPOPs in some GCs thanks to Hubble Space Telescope high-precision proper motions.

scholarly journals The Y dwarf population with HST: unlocking the secrets of our coolest neighbours – I. Overview and first astrometric results

2020 ◽  
Vol 501 (1) ◽  
pp. 911-915
Author(s):  
C Fontanive ◽  
L R Bedin ◽  
D C Bardalez Gagliuffi
Keyword(s):  
Proper Motion ◽  
Hubble Space Telescope ◽  
Proper Motions ◽  
Brown Dwarf ◽  
Space Telescope ◽  
First Results

ABSTRACT In this paper, we present our project that aims at determining accurate distances and proper motions for the Y brown dwarf population using the Hubble Space Telescope. We validate the program with our first results, using a single new epoch of observations of the Y0pec dwarf WISE J163940.83−684738.6. These new data allowed us to refine its proper motion and improve the accuracy of its parallax by a factor of three compared to previous determinations, now constrained to ϖ = 211.11 ± 0.56 mas. This newly derived absolute parallax corresponds to a distance of 4.737 ± 0.013 pc, an exquisite and unprecedented precision for faint ultracool Y dwarfs.

scholarly journals Proper Motions of the HH 111 Jet Observed with the [ITAL]Hubble Space Telescope[/ITAL]

2001 ◽  
Vol 559 (2) ◽  
pp. L157-L161 ◽  
Author(s):  
Patrick Hartigan ◽  
Jon A. Morse ◽  
Bo Reipurth ◽  
Steve Heathcote ◽  
John Bally
Keyword(s):  
Hubble Space Telescope ◽  
Proper Motions ◽  
Space Telescope

scholarly journals Hubble Space Telescope Proper Motions and Stellar Dynamics in the Core of the Globular Cluster 47 Tucanae

2006 ◽  
Vol 166 (1) ◽  
pp. 249-297 ◽  
Author(s):  
Dean E. McLaughlin ◽  
Jay Anderson ◽  
Georges Meylan ◽  
Karl Gebhardt ◽  
Carlton Pryor ◽  
...  
Keyword(s):  
Globular Cluster ◽  
Hubble Space Telescope ◽  
Stellar Dynamics ◽  
Proper Motions ◽  
Space Telescope ◽  
The Core

scholarly journals Deep Hubble Space Telescope Imaging of Globular Clusters toward the Galactic Bulge: Observations, Data Reduction, and Color–magnitude Diagrams

2018 ◽  
Vol 156 (2) ◽  
pp. 41 ◽  
Author(s):  
Roger E. Cohen ◽  
Francesco Mauro ◽  
Javier Alonso-García ◽  
Maren Hempel ◽  
Ata Sarajedini ◽  
...  
Keyword(s):  
Data Reduction ◽  
Globular Clusters ◽  
Hubble Space Telescope ◽  
Galactic Bulge ◽  
Space Telescope

scholarly journals M32: Is there an Ancient and Metal-poor Stellar Population?

2009 ◽  
Vol 5 (S262) ◽  
pp. 333-334
Author(s):  
Giuliana Fiorentino ◽  
Antonela Monachesi ◽  
Scott C. Trager ◽  
Tod R. Lauer ◽  
Abhijit Saha ◽  
...  
Keyword(s):  
Time Series ◽  
Stellar Population ◽  
Hubble Space Telescope ◽  
Variable Stars ◽  
Optical Data ◽  
Ancient Population ◽  
Space Telescope ◽  
Rr Lyrae ◽  
Short Period ◽  
Magnitude Diagram

AbstractWe observed two fields near M32 with the ACS/HRC (Program GO-10572, PI: T. Lauer) on board the Hubble Space Telescope, located at distances of about 1.8' and 5.4' (hereafter F1 and F2, respectively) from the center of M32. To obtain a very detailed and deep color-magnitude diagram (CMD) and to look for short period variability, we obtained time-series imaging of each field in 32-orbit-long exposures using the F435W (B) and F555W (V) filters, spanning a temporal range of 2 days per filter. We focus on our detection of variability on RR Lyrae variable stars, which represents the only way to obtain information about the presence of a very old population (larger than 10 Gyr) in M32 from optical data. Here we present results obtained from the detection of 31 RR Lyrae in these fields: 17 in F1 and 14 in F2. We claim we detected 7+4−3 RR Lyrae variables belonging to M32 in F1 thus indicating the presence of a metal-poor ancient population in M32.

scholarly journals Improved Hubble Space Telescope proper motions for Tycho-G and other stars in the remnant of Tycho's Supernova 1572

2014 ◽  
Vol 439 (1) ◽  
pp. 354-371 ◽  
Author(s):  
L. R. Bedin ◽  
P. Ruiz-Lapuente ◽  
J. I. González Hernández ◽  
R. Canal ◽  
A. V. Filippenko ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Proper Motions ◽  
Space Telescope
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