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Praesepe white dwarfs in Gaia DR2
Salaris, M.; Bedin, L. R.
We have exploited Gaia Data Release 2 to study white dwarf members of the Praesepe star cluster. We recovered 11 known white dwarf members (all DA spectral type) plus a new cluster WD never identified before. 2 of the 11 known DA objects did not satisfy all quality indicators available in the data release. The remaining nine objects of known spect…
Dynamical Masses for the Triple System HD 28363 in the Hyades Cluster
Torres, Guillermo; Latham, David W.; Stefanik, Robert P.
The star HD 28363 in the Hyades cluster has been known for over a century as a visual binary with a period of 40 yr. The secondary is, in turn, a single-lined spectroscopic binary with a 21 day period. Here we report extensive spectroscopic monitoring of this hierarchical triple system that reveals the spectral lines of the third star for the firs…
The discovery of a Li/Na-rich giant star in Omega Centauri: formed from the pure ejecta of super-AGB stars?
Salaris, M.; Bonifacio, P.; Monaco, L. +3 more
We report the discovery of two Li-rich giant stars (fainter than the red giant branch (RGB) bump) in the stellar system Omega Centauri using GIRAFFE-FLAMES spectra. These two stars have A(Li) = 1.65 and 2.40 dex and they belong to the main population of the system ([Fe/H] = -1.70 and -1.82, respectively). The most Li-rich of them (#25664) has [Na/…
Position-dependent microchannel plate gain correction in Rosetta's ROSINA/DFMS mass spectrometer
Altwegg, K.; Balsiger, H.; Fuselier, S. A. +7 more
Dissecting a Disk-instability Outburst in a Symbiotic Star: NuSTAR and Swift Observations of T Coronae Borealis during the Rise to the “Superactive” State
Nelson, T.; Mukai, K.; Sokoloski, J. L. +1 more
The current superactive state of the recurrent nova T Coronae Borealis (T CrB) has been observed with unprecedented detail. Previously published observations provide strong evidence that this state is due to an enhancement of the flow of material through the accretion disk, which increased the optical depth of its most internal region, the boundar…
Can Reconnection be Triggered as a Solar Wind Directional Discontinuity Crosses the Bow Shock? A Case of Asymmetric Reconnection
Gunell, H.; Hamrin, M.; Vaivads, A. +7 more
Here we present some unique observations of reconnection at a quasi-perpendicular bow shock as an interplanetary directional discontinuity (DD) is crossing it simultaneously with the Magnetospheric Multiscale (MMS) mission. There are no burst data, but available data show indications of ongoing reconnection at the shock southward of MMS: a bifurca…
Estimating the mass of CMEs from the analysis of EUV dimmings
Cremades, H.; Balmaceda, L. A.; Nuevo, F. A. +2 more
Context. Reliable estimates of the mass of coronal mass ejections (CMEs) are required to quantify their energy and predict how they affect space weather. When a CME propagates near the observer's line of sight, these tasks involve considerable errors, which motivated us to develop alternative means for estimating the CME mass.
Aims: We aim at…
Using HARPS-N to characterize the long-period planets in the PH-2 and Kepler-103 systems
Vanderburg, Andrew; López-Morales, Mercedes; Buchhave, Lars A. +26 more
We present confirmation of the planetary nature of PH-2b, as well as the first mass estimates for the two planets in the Kepler-103 system. PH-2b and Kepler-103c are both long-period and transiting, a sparsely populated category of exoplanets. We use Kepler light-curve data to estimate a radius, and then use HARPS-N radial velocities to determine …
ULX contribution to stellar feedback: an intermediate-mass black hole candidate and the population of ULXs in the low-metallicity starburst galaxy ESO 338-4
Östlin, G.; Hayes, M.; Mas-Hesse, J. M. +5 more
Context. X-ray radiation from accreting compact objects is an important part of stellar feedback. The metal-poor galaxy ESO 338-4 has experienced vigorous starburst during the last <40 Myr and contains some of the most massive super star clusters in the nearby Universe. Given its starburst age and its star-formation rate, ESO 338-4 is one of th…
Gaia-assisted selection of a quasar reddened by dust in an extremely strong damped Lyman-α absorber at z = 2.226
Milvang-Jensen, B.; Fynbo, J. P. U.; Christensen, L. +7 more
Damped Lyman-α absorbers (DLAs) as a class of quasi-stellar object (QSO) absorption-line systems are currently our most important source of detailed information on the cosmic chemical evolution of galaxies. However, the degree to which this information is biased by dust remains to be understood. One strategy is to specifically search for QSOs that…