Search Publications
Kinematic study of the association Cyg OB3 with Gaia DR2
Boubert, Douglas; Gandhi, Poshak; Rao, Anjali +3 more
We study the stellar kinematic properties and spatial distribution of the association Cyg OB3 using precise astrometric data from Gaia DR2. All known O- and B-type stars in Cyg OB3 region with positions, parallaxes, and proper motions available are included, comprising a total of 41 stars. The majority of stars are found to be concentrated at a he…
Internal kinematics of giant H II regions in M101 with the Keck Cosmic Web Imager
Bresolin, Fabio; Ho, I. -Ting; Rizzi, Luca +6 more
We study the kinematics of the giant H II regions NGC 5455 and NGC 5471 located in the galaxy M101, using integral field observations that include the H β and [O III] $\, \lambda$ 5007 emission lines, obtained with the Keck Cosmic Web Imager. We analyse the line profiles using both single and multiple Gaussian curves, gathering evidence for the pr…
The evolutionary status of protostellar clumps hosting class II methanol masers
Avison, A.; Elia, D.; Schisano, E. +9 more
The Methanol MultiBeam survey (MMB) provides the most complete sample of Galactic massive young stellar objects (MYSOs) hosting 6.7 GHz class II methanol masers. We characterize the properties of these maser sources using dust emission detected by the Herschel Infrared Galactic Plane Survey (Hi-GAL) to assess their evolutionary state. Associating …
Mon-735: a new low-mass pre-main-sequence eclipsing binary in NGC 2264
Aigrain, Suzanne; Gillen, Edward; Cody, Ann Marie +3 more
We present Mon-735, a detached double-lined eclipsing binary (EB) member of the ∼3 Myr old NGC 2264 star-forming region, detected by Spitzer. We simultaneously model the Spitzer light curves, follow-up Keck/HIRES radial velocities, and the system's spectral energy distribution to determine self-consistent masses, radii, and effective temperatures …
The X-ray emission in young radio active galactic nuclei
Chen, Liang; Liao, Mai; Gu, Minfeng +1 more
In this work, we investigated the X-ray emission for a sample of young radio active galactic nuclei (AGNs) by combining data from Chandra/XMM-Newton with data for other wavebands. We find strong correlations between the X-ray luminosity LX at 2-10 keV and the radio luminosities LR at 5 GHz for the VLBI radio-core, VLA radio-c…
MEGARA-IFU detection of extended He II λ4686 nebular emission in the central region of NGC 1569 and its ionization budget
Terlevich, E.; Terlevich, R.; Charlot, S. +21 more
We here report the detection of extended He II λ4686 nebular emission in the central region of NGC 1569 using the integral field spectrograph MEGARA at the 10.4 m Gran Telescopio Canarias. The observations cover a field of view (FoV) of 12.5 arcsec × 11.3 arcsec at a seeing-limited spatial resolution of ∼15 pc and at a spectral resolution of R = 6…
Magnetic activity and evolution of the four Hyades K giants
Schmitt, J. H. M. M.; Schröder, K. -P.; Mittag, M. +2 more
We determine the exact physical parameters of the four Hyades cluster K giants, using their parallaxes and atmospheric modelling of our red-channel TIGRE high-resolution spectra. Performing a comparison with well-tested evolutionary tracks, we derive exact masses and evolutionary stages. At an age of 588 (±60) Myr and with a metallicity of Z = 0.0…
The 2016 January eruption of recurrent Nova LMC 1968
Soszyński, I.; Udalski, A.; Szymański, M. K. +23 more
We present a comprehensive review of all observations of the eclipsing recurrent Nova LMC 1968 in the Large Magellanic Cloud which was previously observed in eruption in 1968, 1990, 2002, 2010, and most recently in 2016. We derive a probable recurrence time of 6.2 ± 1.2 yr and provide the ephemerides of the eclipse. In the ultraviolet-optical-IR p…
Uncovering the orbit of the hercules dwarf galaxy
Strader, Jay; Erkal, Denis; Sand, David J. +6 more
We present new chemo-kinematics of the Hercules dwarf galaxy based on Keck II-DEIMOS spectroscopy. Our 21 confirmed members, including 9 newly confirmed members, have a systemic velocity of VHerc = 46.4 ± 1.3 km s-1 and a velocity dispersion $\sigma _{V,\mathrm{Herc}}=4.4^{+1.4}_{-1.2}$ km s-1, consistent with prev…
PHL 417: a zirconium-rich pulsating hot subdwarf (V366 Aquarid) discovered in K2 data
Hermes, J. J.; Saio, H.; Reed, M. D. +6 more
The Kepler spacecraft observed the hot subdwarf star PHL 417 during its extended K2 mission, and the high-precision photometric light curve reveals the presence of 17 pulsation modes with periods between 38 and 105 min. From follow-up ground-based spectroscopy, we find that the object has a relatively high temperature of 35 600 K, a surface gravit…