Search Publications
Herschel spectroscopy of massive young stellar objects in the Magellanic Clouds
Lebouteiller, V.; Filipović, M. D.; Cormier, D. +11 more
We present Herschel Space Observatory Photodetector Array Camera and Spectrometer (PACS) and Spectral and Photometric Imaging Receiver Fourier Transform Spectrometer (SPIRE FTS) spectroscopy of a sample of 20 massive Young Stellar Objects (YSOs) in the Large and Small Magellanic Clouds (LMC and SMC). We analyse the brightest far-infrared (far-IR) …
Stellar streams around the Magellanic Clouds in 4D
Belokurov, V.; Koposov, S. E.; Catelan, M. +7 more
We carried out a spectroscopic follow-up programme of the four new stellar stream candidates detected by Belokurov & Koposov in the outskirts of the Large Magellanic Cloud (LMC) using FORS2 (VLT). The medium-resolution spectra were used to measure the line-of-sight velocities, estimate stellar metallicities, and classify stars into Blue Horizo…
Long-term soft and hard X-ray investigation of the colliding wind WN+O binary WR 25
Pandey, J. C.; De Becker, M.; Arora, Bharti
We investigated the long-term behaviour in X-rays of the colliding wind binary WR 25, using archival data obtained with Suzaku, Swift, XMM-Newton, and NuSTAR spanning over ∼16 yr. Our analysis reveals phase-locked variations repeating consistently over many consecutive orbits, in agreement with an X-ray emission fully explained by thermal emission…
An insight into the extragalactic transient and variable microJy radio sky across multiple decades
Thomson, A. P.; Garrett, Michael A.; Radcliffe, Jack F. +3 more
The mJy variable extragalactic radio sky is known to be broadly non-changing with approximately 3{{ per cent}} of persistent radio sources exhibiting variability that is largely active galactic nucleus-related (AGN). In the faint (<mJy) flux density regime, it is widely accepted that the radio source population begins to change from AGN dominat…
Bolometric corrections of stellar oscillation amplitudes as observed by the Kepler, CoRoT, and TESS missions
Lund, Mikkel N.
A better understanding of the amplitudes of stellar oscillation modes and surface granulation is essential for improving theories of mode physics and the properties of the outer convection zone of solar-like stars. A proper prediction of these amplitudes is also essential for appraising the detectability of solar-like oscillations for asteroseismi…
Testing the weak equivalence principle by differential measurements of fundamental constants in the Magellanic Clouds
Wang, W. -H.; Levshakov, S. A.; Agafonova, I. I. +4 more
Non-standard fields are assumed to be responsible for phenomena attributed to dark energy and dark matter. Being coupled to ordinary matter, these fields modify the masses and/or charges of the elementary particles, thereby violating the weak equivalence principle. Thus, values of fundamental constants such as the proton-to-electron mass ratio, &m…
The outbursting protostar 2MASS 22352345 + 7517076 and its environment
Prusti, T.; Ábrahám, P.; Kun, M. +2 more
We studied the Class I protostar 2MASS 22352345 + 7517076 whose dramatic brightening between the IRAS, Akari, and WISE surveys was reported by Onozato et al. 2MASS 22352345+7517076 is a member of a small group of low-mass young stellar objects, associated with IRAS 22343 + 7501 in the molecular cloud Lynds 1251. The IRAS, ISO, Spitzer, Akari, Hers…
The ultracool helium-atmosphere white dwarf companion of PSR J0740+6620?
Zharikov, S. V.; Karpova, A. V.; Zyuzin, D. A. +4 more
We report detection of the likely companion of the binary millisecond pulsar (MSP) J0740+6620 with the Gran Telescopio Canarias in the r' and i' bands. The position of the detected starlike source coincides with the pulsar coordinates within the 1σ uncertainty of ≈0.2 arcsec. Its magnitudes are r' = 26.51 ± 0.17 and i' = 25.49 ± 0.15. Comparing th…
The white dwarf luminosity functions from the Pan-STARRS 1 3π Steradian Survey
Chambers, Kenneth C.; Magnier, Eugene A.; Wainscoat, Richard J. +9 more
A large sample of white dwarfs is selected by both proper motion and colours from the Pan-STARRS 1 3π Steradian Survey Processing Version 2 to construct the white dwarf luminosity functions of the discs and halo in the solar neighbourhood. Four-parameter astrometric solutions were recomputed from the epoch data. The generalized maximum volume meth…
Extra-tidal structures around the Gaia Sausage candidate globular cluster NGC 6779 (M56)
Carballo-Bello, Julio A.; Piatti, Andrés E.
We present results on the stellar density radial profile of the outer regions of NGC 6779, a Milky Way globular cluster recently proposed as a candidate member of the Gaia Sausage structure, a merger remnant of a massive dwarf galaxy with the Milky Way. Taking advantage of the Pan-STARRS PS1 public astrometric and photometric catalogue, we built t…