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Characterizing brown dwarf companions with IRDIS long-slit spectroscopy: HD 1160 B and HD 19467 B
Heng, K.; D'Orazi, V.; Boccaletti, A. +9 more
The determination of the fundamental properties (mass, separation, age, gravity, and atmospheric properties) of brown dwarf companions allows us to infer crucial informations on their formation and evolution mechanisms. Spectroscopy of substellar companions is available to date only for a limited number of objects (and mostly at very low resolutio…
The AGN contribution to the UV-FIR luminosities of interacting galaxies and its role in identifying the main sequence
Smith, Howard A.; Ashby, M. L. N.; Ramos Padilla, Andrés F. +5 more
Emission from active galactic nuclei (AGNs) is known to play an important role in the evolution of many galaxies including luminous and ultraluminous systems (U/LIRGs), as well as merging systems. However, the extent, duration, and exact effects of its influence are still imperfectly understood. To assess the impact of AGNs on interacting systems,…
Rapid Rotation of Kepler Field Dwarfs and Subgiants: Spectroscopic v sin i from APOGEE
van Saders, Jennifer L.; Simonian, Gregory V. A.; Pinsonneault, Marc H. +1 more
We use 5337 spectroscopic $v\sin i$ measurements of Kepler dwarfs and subgiants from the APOGEE survey to study stellar rotation trends. We find a detection threshold of 10 km s-1, which allows us to explore the spindown of intermediate-mass stars leaving the main sequence, merger products, young stars, and tidally synchronized binaries…
Birth sites of young stellar associations and recent star formation in a flocculent corrugated disc
Minchev, Ivan; Gagné, Jonathan; Chakrabarti, Sukanya +3 more
With backwards orbit integration, we estimate birth locations of young stellar associations and moving groups identified in the solar neighbourhood that are younger than 70 Myr. The birth locations of most of these stellar associations are at a smaller galactocentric radius than the Sun, implying that their stars moved radially outwards after birt…
A New Window into the Nature of X-Ray Binaries in M101 from Their Optical Emission
Chandar, Rupali; Mok, Angus; Gallo, Elena +3 more
The high-energy emission from nearby, star-forming galaxies is dominated by X-ray binaries, where a neutron star or black hole is accreting mass from either a low-mass (≲3 M⊙) or high-mass (≳8 M⊙) star. Donor stars with intermediate masses ≈3-7 M⊙ are also possible, but rarer in our Galaxy. Since it is not possible…
VLT/X-Shooter Spectroscopy of Lyman Break Analogs: Direct-method O/H Abundances and Nitrogen Enhancements
Heckman, Timothy M.; Overzier, Roderik A.; Loaiza-Agudelo, Maryory
We used Very Large Telescope/X-Shooter to target a sample of nearby analogs of Lyman break galaxies (LBGs). These Lyman break analogs are similar to the LBGs in many of their physical properties. We determine electron temperatures using the weak [O III] λ4363 emission line and determine the oxygen abundance (O/H) using the direct and strong-line m…
An Ejecta Kinematics Study of Kepler's Supernova Remnant with High-resolution Chandra HETG Spectroscopy
Sato, Toshiki; Hughes, John P.; Slane, Patrick +6 more
We report our measurements of the bulk radial velocity from a sample of small, metal-rich ejecta knots in Kepler's supernova remnant (SNR). We measure the Doppler shift of the He-like Si Kα line-center energy in the spectra of these knots based on our Chandra High-Energy Transmission Grating Spectrometer observation to estimate their radial veloci…
Assessment of Systematic Uncertainties in the Cosmological Analysis of the SDSS Supernovae Photometric Sample
Scolnic, Dan; Kessler, Richard; Popovic, Brodie
Improvements to the precision of measurements of cosmological parameters with Type Ia supernovae (SNe Ia) are expected to come from large photometrically identified (photometric) supernova (SN) samples. Here we reanalyze the Sloan Digital Sky Survey (SDSS) photometric SN sample, with roughly 700 high-quality, likely but unconfirmed SNe Ia light cu…
Comprehensive photometric investigation of an active early K-type contact system—IL Cancri
Sarotsakulchai, Thawicharat; Liu, Nian-Ping; Rattanasoon, Somsawat +1 more
Comprehensive photometric investigation of the early K-type contact binary IL Cnc was carried out. A few light curves from both ground-based telescopes and the Kepler space telescope were obtained (or downloaded) and then analyzed in detail. They are mostly found to be asymmetric and there are even continuously changing O'Connell effects in the li…
A chromosome map to unveil stellar populations with different magnesium abundances. The case of ω Centauri
Milone, A. P.; Cordoni, G.; Marino, A. F. +7 more
Historically, photometry has been largely used to identify stellar populations [multiple populations (MPs)] in globular clusters (GCs) by using diagrams that are based on colours and magnitudes that are mostly sensitive to stars with different metallicities or different abundances of helium, carbon, nitrogen, and oxygen. In particular, the pseudo-…