Results 81 to 90 of about 30,917 (231)
Faint White Dwarf Flux Standards: Data and Models
The Astronomical JournalFainter standard stars are essential for the calibration of larger telescopes. This work adds to the calibration spectra (CALSPEC) database of 19 faint white dwarfs (WDs) with all-sky coverage and V magnitudes between 16.5 and 18.7.
Ralph C. Bohlin +9 more
doaj +1 more source
A novel image reconstruction method applied to deep Hubble Space Telescope Images [PDF]
, 1997 We have developed a method for the linear reconstruction of an image from undersampled, dithered data, which has been used to create the distributed, combined Hubble Deep Field images -- the deepest optical images yet taken of the universe. The algorithm,
Fruchter, Andrew, Hook, Richard
core +3 more sources
Gaia23ckh: Symbiotic outburst of the assumed Mira variable V390 Sco
Astronomische Nachrichten, Volume 345, Issue 5, June 2024.Abstract The poorly studied variable star V390 Sco, previously classified as a Mira pulsator, was detected in a brightening event by the ESA Gaia satellite in September 2023. This work presents an analysis of available archival multifrequency photometric data of this target, along with our spectroscopic observations. Our findings lead to the conclusion
Jaroslav Merc +7 more
wiley +1 more source
Astronomische Nachrichten, Volume 345, Issue 5, June 2024.Abstract We exploit the astro‐photometric dataset of the multi‐epoch infrared parallel field of a Hubble Space Telescope Large Programme aimed at studying the faintest stars of the globular cluster NGC 6752 to determine the luminosity and mass functions of the multiple stellar populations of this cluster. Thanks to the measurement of proper motions and
Michele Scalco +10 more
wiley +1 more source
The “Canonical” White Dwarf Cooling Sequence of M5
The Astrophysical Journal, 2023 Recently, slowly cooling white dwarfs (WDs) are a new class of WD that have been identified in two globular clusters (namely M13 and NGC 6752), showing a horizontal branch (HB) morphology with an extended blue tail.
Jianxing Chen +7 more
doaj +1 more source
A Homogenous Set of Globular Cluster Relative Distances and Reddenings [PDF]
, 2004 We present distance modulus and reddening determinations for 72 Galactic globular clusters from the homogeneous photometric database of Piotto et al. (2002), calibrated to the HST flight F439W and F555W bands.
A. Aparicio +72 more
core +4 more sources
Journal of Geophysical Research: Planets, Volume 129, Issue 3, March 2024.Abstract Toroidal atmospheres and exospheres characterized at exoplanets may be fueled by volcanically active exomoons, often referred to as exo‐Ios. We study the neutral outgassing and volatile evolution of a close‐orbiting, evaporating satellite at eight candidate exoplanet‐exomoon systems WASP‐49,‐96,‐69,‐17 b, XO‐2N b, HAT‐P‐1 b, HD‐189733 b, and ...
M. Meyer zu Westram, A. V. Oza, A. Galli
wiley +1 more source
On the use of asymmetric PSF on NIR images of crowded stellar fields
, 2014 We present data collected using the camera PISCES coupled with the Firt Light Adaptive Optics (FLAO) mounted at the Large Binocular Telescope (LBT).
Arcidiacono, Carmelo +10 more
core +1 more source
The Progenitor of the Type IIb SN 2008ax Revisited [PDF]
, 2015 Hubble Space Telescope observations of the site of the supernova (SN) 2008ax obtained in 2011 and 2013 reveal that the possible progenitor object detected in pre-explosion images was in fact multiple.
Benvenuto, Omar G. +5 more
core +4 more sources
HST astrometry of the closest brown dwarfs‐II. Improved parameters and constraints on a third body
Astronomische Nachrichten, Volume 345, Issue 1, January 2024.Abstract Located at less than two pc away, Luhman 16 AB (WISE J104915.57‐531906.1) is the closest pair of brown dwarfs and the third closest “stellar” system to Earth. An exoplanet candidate in the Luhman 16 binary system was reported in 2017 based on a weak astrometric signature in the analysis of 12 HST epochs.
L. R. Bedin +7 more
wiley +1 more source