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Five Stellar Populations in M22 (NGC 6656)
Lee, Jae-Woo
We present the Ca-CN-CH photometry of the metal-complex globular cluster (GC) M22 (NGC 6656). Our photometry clearly shows the discrete double CN-CH anticorrelations in M22 red giant branch (RGB) stars, due to the difference in the mean metallicity. The populational number ratio between the two main groups is n(G1):n(G2) = 63:37(±3), with the G1 b…
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 GAPS programme at TNG. XXIII. HD 164922 d: close-in super-Earth discovered with HARPS-N in a system with a long-period Saturn mass companion
Scandariato, G.; Pagano, I.; Marzari, F. +41 more
Context. Observations of exoplanetary systems demonstrate that a wide variety of planetary architectures are possible. Determining the rate of occurrence of Solar System analogues - with inner terrestrial planets and outer gas giants - remains an open question.
Aims: Within the framework of the Global Architecture of Planetary Systems (GAPS) …
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…
Orbits of Five Triple Stars
Latham, David W.; Tokovinin, Andrei
Joint analysis of radial velocities and position measurements of five hierarchical stellar systems is undertaken to determine elements of their inner and outer orbits and, whenever possible, their mutual inclinations. The inner and outer periods are 12.9 and 345 yr for HD 12376 (ADS 1613), 1.14 and ∼1500 yr for HD 19971 (ADS 2390), 8.3 and 475 yr …
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…