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30-micron sources in galaxies with different metallicities
Szczerba, R.; Lagadec, E.; Volk, K. +2 more
Aims: We present an analysis and comparison of the 30 µm dust features seen in the Spitzer Space Telescope spectra of 207 carbon-rich asymptotic giant branch (AGB) stars, post-AGB objects, and planetary nebulae (PNe) located in the Milky Way, the Magellanic Clouds (MCs), or the Sagittarius dwarf spheroidal galaxy (Sgr dSph), which are c…
Spectroscopic Redshift of the Gamma-Ray Blazar B2 1215+30 from Lyα Emission
Furniss, A.; Johnson, C. A.; Williams, D. A. +4 more
We report on Cosmic Origin Spectrograph observations of the gamma-ray bright blazar B2 1215+30, collected in 2015 November. These observations allow for the confirmation of the source redshift from the detection of a Lyα emission feature at λ ∼ 1374 Å. The emission feature places the source at a redshift of z = 0.1305 ± 0.003, confirming the sourc…
Catalog of equatorial coordinates and B‑magnitudes of the Kitab's part of the FON project
Andruk, V.; Yuldoshev, Q.; Relke, H. +3 more
We present a catalog of stars with equatorial coordinates α and δ and B‑magnitudes of stars for the Kitab's section of the FON project (FON‑Kitab). The photographic plates of the FON project were exposed on the double telescope Double Zeiss Astrograph (DAZ, D/F = 40/300, 69″/mm) at the Kitab observatory of the Republic of Uzbekistan. A total of 19…
HR 10: a main-sequence binary with circumstellar envelopes around both components. Discovery and analysis
Eiroa, C.; Montesinos, B.; Absil, O. +16 more
Context. This paper is framed within a large project devoted to studying the presence of circumstellar material around main sequence stars, and looking for exocometary events. The work concentrates on HR 10 (A2 IV/V), known for its conspicuous variability in the circumstellar narrow absorption features of Ca II K and other lines, so far interprete…
Emission-line Metallicities from the Faint Infrared Grism Survey and VLT/MUSE
Finkelstein, Steven L.; Hathi, Nimish; Windhorst, Rogier +20 more
We derive direct-measurement gas-phase metallicities of 7.4< 12+{log}({{O}}/{{H}})< 8.4 for 14 low-mass emission-line galaxies at 0.3 < z < 0.8 identified in the Faint Infrared Grism Survey. We use deep slitless G102 grism spectroscopy of the Hubble Ultra Deep Field, dispersing light from all objects in the field at wavelengths between…
On the linear theory of oblique magnetospheric chorus excitation
Bespalov, P. A.; Savina, O. N.
Some aspects of the theory of generation of magnetospheric chorus are discussed. An original approach to solving the problem of oblique chorus generation near the Gendrin angle is outlined and partially realized within the framework of a beam pulsed amplifier mechanism. Parameters of the resonance electron beam in the chorus excitation region are …
Analysis of the disc components of our galaxy via kinematic and spectroscopic procedures
Bilir, S.; Karaali, S.; Plevne, O. +1 more
We used the spectroscopic and astrometric data provided from the GALactic Archaeology with HERMES (GALAH) Data Release (DR2) and Gaia DR2, respectively, for a large sample of stars to investigate the behaviour of the [α/Fe] abundances via two procedures, that is, kinematically and spectroscopically. With the kinematical procedure, we investigated …
Tomography of the Solar Corona with the Wide-Field Imager for the Parker Solar Probe
Vourlidas, Angelos; Howard, Russell A.; van der Holst, Bart +4 more
The Wide-field Imager for the Parker Solar Probe (PSP/WISPR) comprises two telescopes that record white-light total brightness [B ] images of the solar corona. Their fields of view cover a widely changing range of heliocentric heights over the 24 highly eccentric orbits planned for the mission. In this work, the capability of PSP/WISPR data to car…
He II Emission from Wolf-Rayet Stars as a Tool for Measuring Dust Reddening
Leitherer, Claus; Faisst, Andreas; Lee, Janice C.
We calibrated a technique to measure dust attenuation in star-forming galaxies. The technique utilizes the stellar-wind lines in Wolf-Rayet stars, which are widely observed in galaxy spectra. The He II 1640 and 4686 features are recombination lines whose ratio is largely determined by atomic physics. Therefore they can serve as a stellar dust prob…
Primeval very low-mass stars and brown dwarfs - V. A halo L3 subdwarf with prograde eccentric orbit in the Galactic plane
Burgasser, A. J.; Zhang, Z. H.; Smith, L. C.
VVV J12564163-6202039 is an L subdwarf located in the Galactic plane (b = 0{^{circ}.}831) discovered by its high proper motion (1.1 arcsec yr-1). We obtained an optical to near-infrared spectrum of it with the X-shooter on the Very Large Telescope, and re-classified it as an sdL3 subdwarf. Its best-fitting BT-Dusty model spec…