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Hubble Space Telescope Spectroscopy of a Planetary Nebula in an M31 Open Cluster: Hot-bottom Burning at 3.4 M ⊙
Bond, Howard E.; Ciardullo, Robin; Jacoby, George H. +1 more
We use imaging and spectroscopy from the Hubble Space Telescope (HST) to examine the properties of a bright planetary nebula (PN) projected within M31's young open cluster B477-D075. We show that the probability of a chance superposition of the PN on the cluster is small, ≲2%. Moreover, the radial velocity of the PN is the same as that of the clus…
A comparison between the two lobes of comet 67P/Churyumov-Gerasimenko based on D/H ratios in H2O measured with the Rosetta/ROSINA DFMS
De Keyser, Johan; Hansen, Kenneth C.; Gombosi, Tamas I. +13 more
The nucleus of the Jupiter-family comet 67P/Churyumov-Gerasimenko was discovered to be bi-lobate in shape when the European Space Agency spacecraft Rosetta first approached it in 2014 July. The bi-lobate structure of the cometary nucleus has led to much discussion regarding the possible manner of its formation and on how the composition of each lo…
Radio emission from interstellar shocks: Young type Ia supernova remnants and the case of N 103B in the Large Magellanic Cloud
Haberl, F.; Filipović, M. D.; Rowell, G. +19 more
We investigate young type Ia supernova remnants (SNRs) in our Galaxy and neighbouring galaxies in order to understand their properties and early stage of their evolution. Here we present a radio continuum study based on new and archival data from the Australia Telescope Compact Array (ATCA) towards N 103B, a young (≤1000 yrs) spectroscopically con…
A stellar occultation by Vanth, a satellite of (90482) Orcus
Bosh, A. S.; Lister, T. A.; Schindler, K. +5 more
A stellar occultation by the large trans-Neptunian object (90482) Orcus was predicted to occur on 2017 March 07. Observations were made at five sites in North and South America: the 0.6-m Astronomical Telescope of the University of Stuttgart (ATUS) at Sierra Remote Observatories, California; Las Cumbres Observatory's 1-m telescope at McDonald Obse…
UVIT-HST-GAIA view of NGC 288: a census of the hot stellar population and its properties from UV
Rao, N. Kameswara; Stetson, Peter B.; Sahu, Snehalata +2 more
A complete census of the blue horizontal branch (BHB) and blue straggler star (BSS) population within a 10' radius from the centre of the globular cluster NGC 288 is presented, based on images from the Ultraviolet Imaging Telescope (UVIT). The UV and UV-optical colour-magnitude diagrams (CMDs) are constructed by combining the UVIT, HST-ACS and gro…
The enigmatic binary system HD 5980
Hillier, D. John; Morrell, Nidia; Nazé, Yaël +3 more
The Small Magellanic Cloud multiple system HD 5980 contains a luminous blue variable (LBV) that underwent a major eruption in 1994, and whose current spectrum is that of a hydrogen-rich Wolf-Rayet (WR) star. Since the eruption, the wind mass-loss rate has been declining while wind speeds have been steadily increasing. Observations obtained in 2014…
The Atacama Cosmology Telescope: CO(J = 3 - 2) Mapping and Lens Modeling of an ACT-selected Dusty Star-forming Galaxy
Gallardo, Patricio A.; Huffenberger, Kevin M.; Hughes, John P. +13 more
We report Northern Extended Millimeter Array CO(J = 3 - 2) observations of the dusty star-forming galaxy ACT-S J020941+001557 at z = 2.5528, which was detected as an unresolved source in the Atacama Cosmology Telescope (ACT) equatorial survey. Our spatially resolved spectral line data support the derivation of a gravitational lens model from 37 in…
Benchmarking Substellar Evolutionary Models Using New Age Estimates for HD 4747 B and HD 19467 B
Crepp, Justin R.; White, Timothy R.; Brewer, John M. +5 more
Constraining substellar evolutionary models (SSEMs) is particularly difficult due to a degeneracy between the mass, age, and luminosity of a brown dwarf. In cases where a brown dwarf is found as a directly imaged companion to a star, as in HD 4747 and HD 19467, the mass, age, and luminosity of the brown dwarf are determined independently, making t…
A Wide-field Photometric Survey of Globular Clusters in the Peculiar Early-type Galaxy M85
Park, Byeong-Gon; Hwang, Narae; Lee, Myung Gyoon +4 more
We survey globular clusters (GCs) in M85 using ugi-band images of a 1° × 1° field obtained with the MegaCam at the 3.6 m Canada-France-Hawaii Telescope. We identify 1318 GC candidates with 20.0 mag < g 0 < 23.5 mag in the entire survey region. Their radial number density profile is well fit by a Sérsic profile with n = {2.58}…
Multifractal Analysis of Heliospheric Magnetic Field Fluctuations Observed by Ulysses
Bruno, Roberto; Wawrzaszek, Anna; Echim, Marius
We present the multifractal study of the intermittency of the magnetic field turbulence in the fast and slow solar wind beyond the ecliptic plane during two solar minima (1997-1998, 2007-2008) and solar maximum (1999-2001). More precisely, we consider 126 time intervals of Ulysses magnetic field measurements, obtain the multifractal spectra, and e…