Search Publications
Missions
Journals
Publication Years
DEATHSTAR: nearby AGB stars with the Atacama Compact Array. II. CO envelope sizes and asymmetries: the S-type stars
Lindqvist, M.; Olofsson, H.; Sahai, R. +13 more
Aims: We aim to constrain the sizes of, and investigate deviations from spherical symmetry in, the CO circumstellar envelopes (CSEs) of 16 S-type stars, along with an additional 7 and 4 CSEs of C-type and M-type AGB stars, respectively.
Methods: We map the emission from the CO J = 2-1 and 3-2 lines observed with the Atacama Compact Array…
Subaru Hyper Suprime-Cam Survey of Cygnus OB2 Complex - I. Introduction, photometry, and source catalogue
Herczeg, Gregory J.; Jose, Jessy; Pyo, Tae-Soo +11 more
Low-mass star formation inside massive clusters is crucial to understand the effect of cluster environment on processes like circumstellar disc evolution, planet, and brown dwarf formation. The young massive association of Cygnus OB2, with a strong feedback from massive stars, is an ideal target to study the effect of extreme environmental conditi…
BRITE observations of ν Centauri and γ Lupi, the first non-eclipsing members of the new class of nascent binaries
Handler, G.; Wade, G. A.; Pigulski, A. +8 more
Results of an analysis of the BRITE-Constellation and Solar Mass Ejection Imager photometry and radial-velocity observations, archival and new, of two single-lined spectroscopic binary (SB) systems ν Centauri and γ Lupi are reported. In the case of γ Lup AB, a visual binary, an examination of the light-time effect shows that component A is the SB.…
NOEMA Observations of CO Emission in Arp 142 and Arp 238
Xu, C. K.; Lisenfeld, U.; Gao, Y. +1 more
Previous studies have shown significant differences in the enhancement of the star formation rate (SFR) and star formation efficiency (SFE = SFR/Mmol) between spiral-spiral and spiral-elliptical mergers. In order to shed light on the physical mechanism of these differences, we present NOEMA observations of the molecular gas distribution…
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…