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The M dwarf problem: Fe and Ti abundances in a volume-limited sample of M dwarf stars
Wallerstein, George; Woolf, Vincent M.
We report iron and titanium abundance measurements from high-resolution spectra in a volume-limited sample of 106 M0 and M0.5 dwarf stars. The sample includes stars north of the celestial equator and closer than 29 parsecs. The results imply that there is an M dwarf problem similar to the previously known G dwarf problem, in that the fraction of l…
Deviations from the Infrared-radio Correlation in Massive, Ultracompact Starburst Galaxies
Moustakas, John; Coil, Alison L.; Rudnick, Gregory H. +11 more
Feedback through energetic outflows has emerged as a key physical process responsible for transforming star-forming galaxies into the quiescent systems observed in the local universe. To explore this process, this paper focuses on a sample of massive and compact merger remnant galaxies hosting high-velocity gaseous outflows ( $| v| \gtrsim {10}^{3…
A multiwavelength search for black widow and redback counterparts of candidate γ-ray millisecond pulsars
Tiengo, A.; Belfiore, A.; Marelli, M. +6 more
The wealth of detections of millisecond pulsars (MSPs) in γ-rays by Fermi has spurred searches for these objects among the several unidentified γ-ray sources. Interesting targets are a sub-class of binary MSPs, dubbed 'black widows' (BWs) and 'redbacks' (RBs), which are in orbit with low-mass non-degenerate companions fully or partially ablated by…
Speckle Interferometry of Nearby Multiple Stars: 2007-2019 Positional Measurements and Orbits of Eight Objects
Dyachenko, V.; Beskakotov, A.; Maksimov, A. +4 more
The orbits of eight systems with low-mass components (HIP 14524, HIP 16025, HIP 28671, HIP 46199, HIP 47791, HIP 60444, HIP 61100, and HIP 73085) are presented. Speckle interferometric data were obtained at the 6 m Big Telescope Alt-azimuth Special Astrophysical Observatory of the Russian Academy of Sciences (BTA SAO RAS) from 2007 to 2019. New da…
INTEGRAL results on the electron-positron annihilation radiation and X-ray & Gamma-ray diffuse emission of the Milky Way
Churazov, Eugene; Sunyaev, Rashid; Knödlseder, Jürgen +8 more
This review summarizes INTEGRAL results on two topics: the electron-positron annihilation line and X-ray & Gamma-ray diffuse emission of the Milky Way.
The electron-positron annihilation line at 511 keV is the most prominent spectral feature in the gamma-ray spectrum of the Milky Way. From the observational perspective, INTEGRAL has alrea…ROBO-AO Kepler Asteroseismic Survey. II. Do Stellar Companions Inhibit Stellar Oscillations?
Kulkarni, S. R.; Baranec, Christoph; Duev, Dmitry A. +7 more
The Kepler Space Telescope observed over 15,000 stars for asteroseismic studies. Of these, 75% of dwarfs (and 8% of giants) were found to show anomalous behavior, such as suppressed oscillations (low amplitude) or no oscillations at all. The lack of solar-like oscillations may be a consequence of multiplicity, due to physical interactions with spe…
Keck Cosmic Web Imager (KCWI) spectra of globular clusters and ultracompact dwarfs in the halo of M87
Forbes, Duncan A.; Romanowsky, Aaron J.; Brodie, Jean P. +2 more
Using the Keck Cosmic Web Imager, we obtain spectra of several globular clusters (GCs), ultracompact dwarfs (UCDs), and the inner halo starlight of M87, at a similar projected galactocentric radius of ~5 kpc. This enables us, for the first time, to apply the same stellar population analysis to the GCs, UCDs, and starlight consistently to derive ag…
Infrared properties of planetary nebulae with [WR] and wels central stars
Parthasarathy, M.; Muthumariappan, C.
We report the infrared (IR) properties of planetary nebulae (PNe) with Wolf-Rayet (WR) type and wels central stars known to date and compare them with the IR properties of a sample of PNe with H-rich central stars. We use near-, mid-, and far-IR photometric data from archives to derive the IR properties of PNe. We have constructed IR colour-colour…
Hot gaseous atmospheres of rotating galaxies observed with XMM-Newton
Gaspari, M.; Nulsen, P. E. J.; Donahue, M. +6 more
X-ray emitting atmospheres of non-rotating early-type galaxies and their connection to central active galactic nuclei have been thoroughly studied over the years. However, in systems with significant angular momentum, processes of heating and cooling are likely to proceed differently. We present an analysis of the hot atmospheres of six lenticular…
Ground-based visible spectroscopy of asteroids to support the development of an unsupervised Gaia asteroid taxonomy
Tanga, P.; Galluccio, L.; Cellino, A. +4 more
Context. The Gaia mission of the European Space Agency is measuring reflectance spectra of a number to the order of 105 small Solar System objects. A first sample will be published in the Gaia Data Release scheduled for 2021.
Aims: The aim of our work was to test the procedure developed to obtain taxonomic classifications for aster…