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Ultradense Gas at the Dusty Torus Scale in a Partially Obscured Quasar
Li, Zhenzhen; Zhou, Hongyan; Hao, Lei +5 more
We present detailed studies of the partially obscured quasar 2MASS J151653.23+190048.2 with continuous broadband spectrophotometry from near-infrared (NIR) through optical to ultraviolet (UV). The NIR and optical spectra show strong broad emission lines, while the UV spectrum is dominated by a set of rich intermediate-width emission lines (IELs). …
Search for Evolutionary Changes in the Period of the Classical Cepheid EV Aql
Berdnikov, L. N.
The reduction of all the available photometry for the Cepheid EV Aql has allowed its $O-C$ diagram spanning a time interval of 130 years to be constructed. This has made it possible to calculate the rate of evolutionary decrease in the period, $dP/dt=-33.2({±}{6.9})$ s yr${}^{-1}$, in agreement with the results of model calculations for the second…
Apex and Kinematical Structure of Castor and Ursa Major Moving Stellar Groups
Elsanhoury, W. H.
Based on space velocity components UVW and using a recent dataset for Castor and Ursa Major moving groups, we compute the apex position with two methods. Classical convergent procedures give (Acp, Dcp) = (807830, -172598; Castor, 298334, -346405; UMa) for Castor and Ursa Major groups. According to the AD-map method we deduce …
Chandra Resolves the Double FU Orionis System RNO 1B/1C in X-Rays
Skinner, Stephen L.; Güdel, Manuel
We present new Chandra X-ray observations of the close pair of young stars RNO 1B and 1C (6″ separation) located in the L1287 cloud. RNO 1B erupted in 1978-1990 and is classified as an FU Orionis star (FUor). RNO 1C also shows most of the properties of an FUor but no eruption has been seen yet. Only a few dozen FUors are known and the presence of …
Studies of the distinct regions due to CO selective dissociation in the Aquila molecular cloud
Li, Dalei; Zhou, Jianjun; Wu, Gang +6 more
Aims: We investigate the role of selective dissociation in the process of star formation by comparing the physical parameters of protostellar-prestellar cores and the selected regions with the CO isotope distributions in photo-dissociation regions. We seek to understand whether there is a better connection between the evolutionary age of star…
Evidence for coupling of evolved star atmospheres and spiral arms of the Milky Way
Barmby, Pauline; Gorski, Mark D.
It is imperative to map the strength and distribution of feedback in galaxies to understand how feedback affects galactic ecosystems. H2O masers act as indicators of energy injection into the interstellar medium. Our goal is to measure the strength and distribution of feedback traced by water masers in the Milky Way. We identify optical…
Supernova remnants in nearby galaxies
Sasaki, Manami
Supernova remnants (SNRs) are the aftermath of stellar explosions, which inject large amounts of energy into the interstellar medium (ISM), carving out new structures and transferring kinetic energy to the ISM. They also act as recycling centers, which return elements processed in stars to the ISM, and cosmic particle accelerators. The evolution o…
AT 2016dah and AT 2017fyp: the first classical novae discovered within a tidal stream
Kasliwal, M. M.; Darnley, M. J.; Williams, S. C. +7 more
AT 2016dah and AT 2017fyp are fairly typical Andromeda galaxy (M 31) classical novae. AT 2016dah is an almost text book example of a 'very fast' declining, yet uncommon, Fe II'b' (broad-lined) nova, discovered during the rise to peak optical luminosity, and decaying with a smooth broken power-law light curve. AT 2017fyp is classed as a 'fast' nova…
Dense cores in the Seahorse infrared dark cloud: physical properties from modified blackbody fits to the far-infrared-submillimetre spectral energy distributions
Miettinen, O.
Context. Infrared dark clouds (IRDCs) can be the birth sites of high-mass stars, and hence determining the physical properties of dense cores in IRDCs is useful to constrain the initial conditions and theoretical models of high-mass star formation.
Aims: We aim to determine the physical properties of dense cores in the filamentary Seahorse IR…
Investigation of the Kinematics of Stars from the Gaia Data Release 2 with Radial Velocities Catalogue Using Scalar and Vector Spherical Harmonics
Tsvetkov, A. S.; Amosov, F. A.; Petrov, S. D. +1 more
This paper is a continuation of our work. The proper motions and radial velocities of stars from the Gaia DR2 with RV catalogue have been decomposed. We have confirmed that the Ogorodnikov-Milne model is consistent with the observational data and found the kinematic components that are not described by this model. The beyond-the-model harmonics ha…