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Interferometric observations of SiO thermal emission in the inner wind of M-type AGB stars IK Tauri and IRC+10011
Alcolea, J.; Bujarrabal, V.; Castro-Carrizo, A. +2 more
Context. Asymptotic giant branch (AGB) stars go through a process of strong mass loss that involves pulsations of the atmosphere, which extends to a region in which the conditions are adequate for dust grains to form. Radiation pressure acts on these grains which, coupled to the gas, drive a massive outflow. The details of this process are not cle…
The nonlinear X‑ray/ultraviolet relation in active galactic nuclei: Contribution of instrumental effects on the X‑ray variability
Lusso, E.
We have recently demonstrated that the nonlinear relation between ultraviolet and X‑ray luminosity in quasars is very tight (with an intrinsic dispersion of ∼0.2 dex), once contaminants (e.g., dust reddening, X‑ray absorption), variability, and differences in the active galactic nuclei physical properties are taken into account. This relation has …
Classification of low-luminosity stellar X-ray sources in the field of the Draco dwarf spheroidal galaxy
Stelzer, Beate; Sasaki, Manami; Saeedi, Sara +1 more
Aims: A previous study of the X-ray luminosity function of the X-ray sources in the Draco dwarf spheroidal (dSph) galaxy field indicates the presence of a population of unknown X-ray sources in the soft energy range of 0.5-2 keV. In 2015, there were twenty-six further deep XMM-Newton observations of Draco dSph, providing an opportunity for a …
Revised and updated catalogue of the First Byurakan Survey of Late-Type Stars: second edition
Gigoyan, K. S.; Kostandyan, G. R.; Mickaelian, A. M.
A total of 18 lists of the First Byurakan Survey of Late-Type Stars (FBS LTS) were published between 1990 and 2016. The stars were found on FBS low-dispersion spectroscopic plates. A systematic search and selection were carried out on a surface of ∼16 000 deg2 on almost the whole area of the FBS. As a result, the 'Revised and Updated Ca…
Comparison of neutral outgassing of comet 67P/Churyumov-Gerasimenko inbound and outbound beyond 3 AU from ROSINA/DFMS
Wurz, P.; Altwegg, K.; Berthelier, J. J. +16 more
Context. Pre-equinox measurements of comet 67P/Churyumov-Gerasimenko with the mass spectrometer ROSINA/DFMS on board the Rosetta spacecraft revealed a strongly heterogeneous coma. The abundances of major and various minor volatile species were found to depend on the latitude and longitude of the nadir point of the spacecraft. The observed time var…
From outburst to quiescence: spectroscopic evolution of V1838 Aql imbedded in a bow-shock nebula
Chavushyan, V.; Neustroev, V.; García-Díaz, Ma T. +15 more
We analyse new optical spectroscopic, direct-image and X-ray observations of the recently discovered a high-proper motion cataclysmic variable V1838 Aql. The data were obtained during its 2013 superoutburst and its subsequent quiescent state. An extended emission around the source was observed up to 30 d after the peak of the superoutburst, interp…
A systematic study of ULIRGs using near-infrared absorption bands reveals a strong UV environment in their star-forming regions
Nakagawa, Takao; Baba, Shunsuke; Isobe, Naoki +3 more
We present a systematic study of the 3.0 µm H2O ice and the 3.4 µm aliphatic carbon absorption features toward 48 local ultraluminous infrared galaxies (ULIRGs) using spectra obtained by the AKARI Infrared Camera to investigate the UV environment in their star-forming regions. All the ULIRGs in our sample exhibit a ratio of …
Variable stars in young open cluster NGC 2244
Michalska, Gabriela
We present results of a UBVIC variability survey in the young open cluster NGC 2244. In total, we found 245 variable stars. Most of them, 211 stars, are variables with irregular variations. Furthermore, 23 periodic variables were found. We also detected four candidates for δ Scuti stars and seven eclipsing binaries. Based on the mid-inf…
Chandra Observations of the Massive Star-forming Region Onsala 2
Skinner, Stephen L.; Güdel, Manuel; Sokal, Kimberly R.
Previous radio and infrared observations have revealed an obscured region of high-mass star formation in Cygnus known as Onsala 2 (ON2). Within this region lies the optically revealed young stellar cluster Berkeley 87, which contains several OB stars and the rare oxygen-type Wolf-Rayet star WR 142. Previous radio studies of ON2 have also discovere…
A Sub-damped Lyα Absorber with Unusual Abundances: Evidence of Gas Recycling in a Low-redshift Galaxy Group
Frye, Brenda L.; Bowen, David V.; Tripp, Todd M. +3 more
Using Hubble Space Telescope/Space Telescope Imaging Spectrograph G140M spectroscopy, we investigate an absorption-line system at z = 0.07489 in the spectrum of the quasi-stellar object PG 1543+489 (z QSO = 0.401). The sightline passes within ρ = 66 kpc of an edge-on 2{L}* disk galaxy at a similar redshift, but the galaxy be…