Search Publications
Energy estimation of high-energy particles associated with the SS 433/W 50 system through radio observation at 1.4 GHz
Sakemi, Haruka; Ohmura, Takumi; Machida, Mami +1 more
The radio nebula W 50 is a unique object interacting with the jets of the microquasar SS 433. The SS 433/W 50 system is a good target for investigating the energy of cosmic-ray particles accelerated by galactic jets. We report observations of the radio nebula W 50 conducted with the National Science Foundation's Karl G. Jansky Very Large Array in …
APOGEE view of the globular cluster NGC 6544
Minniti, D.; Bizyaev, D.; Zoccali, M. +16 more
The second phase of the APOGEE survey is providing near-infrared (near-IR), high-resolution, high signal-to-noise spectra of stars in the halo, disc, bar, and bulge of the Milky Way. The near-IR spectral window is especially important in the study of the Galactic bulge, where stars are obscured by the dust and gas of the disc in its line of sight.…
Dark cloud-type chemistry in photodissociation regions with moderate ultraviolet field
Kirsanova, Maria S.; Vasyunin, Anton I.; Semenov, Dmitry A. +1 more
We present a study of emission lines of small hydrocarbons C2H and c-C3H2, and COMs precursors H2CO and CH3OH in order to better understand the possible chemical link between the molecular abundances and UV radiation field in photodissociation regions (PDRs). We study two PDRs around extended …
LAMOST/HRS spectroscopic analysis of two new Li-rich giants
Pan, Kaike; Gao, Qi; Yan, Hong-Liang +9 more
Two Li-rich candidates, TYC 1338-1410-1 and TYC 2825-596-1, were observed by the new high-resolution echelle spectrograph, LAMOST/HRS. Based on their high-resolution and high-signal-to-noise ratio (SNR) spectra, we derived stellar parameters and abundances of 14 important elements for the two candidates. The stellar parameters and lithium abundanc…
Evolution of brightness and magnetic features of young solar-type stars - I. The young G star HIP 89829
Jeffers, S. V.; Piskunov, N.; Hébrard, E. M. +7 more
The evolution in latitude of sunspots is a key feature of the cyclic solar dynamo. Here, we present the results of a spectroscopic and spectropolarimetric monitoring campaign on the young (~20 Myr old) early G star HIP 89829, in order to investigate potential evolution in the distribution of the star's spots and magnetic features. Our analysis of …
Modeling the Unresolved NIR-MIR SEDs of Local (z < 0.1) QSOs
Geier, S.; Aretxaga, I.; González-Martín, O. +8 more
To study the nuclear (≲1 kpc) dust of nearby (z < 0.1) quasi-stellar objects (QSOs), we obtained new near-infrared (NIR) high angular resolution (~0.″3) photometry in the H and Ks bands for 13 QSOs with available mid-infrared (MIR) high angular resolution spectroscopy (~7.5-13.5 µm). We find that in most QSOs, the NIR emission is unresolv…
New magnetic chemically peculiar stars and candidates in the ATLAS first catalogue of variable stars
Paunzen, Ernst; Hümmerich, Stefan; Bernhard, Klaus +1 more
The number of known variable stars has increased by several magnitudes over the last decade, and automated classification routines are becoming increasingly important to cope with this development. Here we show that the 'upside-down CBH variables', which were proposed as a potentially new class of variable stars by Heinze et al. in the ATLAS First…
Nova LMC 2009a as observed with XMM-Newton, compared with other novae
Ness, Jan-Uwe; Behar, Ehud; Pinto, Ciro +9 more
We examine four high-resolution reflection grating spectrometers (RGS) spectra of the February 2009 outburst of the luminous recurrent nova LMC 2009a. They were very complex and rich in intricate absorption and emission features. The continuum was consistent with a dominant component originating in the atmosphere of a shell burning white dwarf (WD…
Detection of the hard X-ray non-thermal emission from Kepler's supernova remnant
Katsuda, Satoru; Terada, Yukikatsu; Bamba, Aya +1 more
We report the first robust detection of the hard X-ray emission in the 15-30 keV band from Kepler's supernova remnant with the silicon PIN-type semiconductor detector of the hard X-ray detector (HXD-PIN) onboard Suzaku. The detection significance is 7.17σ for the emission from Kepler's entire X-ray emitting region. The energy spectrum is found to …
Ethynyl Around the HII Regions S255 and S257
Kirsanova, M. S.; Punanova, A. F.; Buslaeva, A. I.
We present the results of the ethynyl (C2H) emission line observations towards the S255 and S257 HII regions and the molecular cloud between them. Radial profiles of line brightness, column density, and abundance of C2H are obtained. We show that the radial profile of the ethynyl abundance is almost flat towards the HII regio…