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ASAS census of twins
Bakış, Volkan; Yücel, Gökhan; Eker, Zeki +2 more
Twin binaries were identified among the eclipsing binaries with δ > -30° listed in the All Sky Automated Survey (ASAS) catalogue. In addition to the known twin binaries in the literature, 68 new systems have been identified and photometric and spectroscopic observations were done. Colour, spectral type, temperature, ratio of radii and masses of…
A Large Massive Quiescent Galaxy Sample at z ∼ 1.2
Sawicki, Marcin; Cheng, Cheng; Huang, Jia-Sheng +8 more
In this paper we present a simple color-magnitude selection and obtain a large sample of 33,893 massive quiescent galaxies at intermediate redshifts (1 < z < 1.5). We choose the longest wavelength available in the Hyper-Supreme-Cam (HSC) deep survey, the Y band and i - Y color, to select the 4000 Å Balmer jump in passive galaxies to the high…
The effects of unresolved double degenerates in the white dwarf luminosity function
Rebassa-Mansergas, A.; Torres, S.; Toonen, S. +1 more
We perform an analysis of the single white dwarf and the double degenerate binary populations in the solar neighbourhood following a population synthesis approach to investigate the effects of unresolved double degenerates in the white dwarf luminosity function. We consider all unresolved synthetic binaries to be associated with fictitious effecti…
Variability of the Great Disk Shadow in Serpens
Green, Joel D.; Pontoppidan, Klaus M.; Salyk, Colette +2 more
We present dual-epoch Hubble Space Telescope imaging of the great disk shadow in the Serpens star-forming region. The near-infrared images show strong variability of the disk shadow, revealing dynamics of the inner disk on timescales of months. The Great Shadow is projected onto the Serpens reflection nebula by an unresolved protoplanetary disk su…
A Detailed Analysis of the Cloud Structure and Dynamics in Aquila Rift
Nakamura, Fumitaka; Dobashi, Kazuhito; Shimoikura, Tomomi +1 more
We present maps in several molecular emission lines of a 1 square degree region covering the W40 and Serpens South molecular clouds belonging to the Aquila Rift complex. The observations were made with the 45 m telescope at the Nobeyama Radio Observatory. We found that the 12CO and 13CO emission lines consist of several veloc…
Mapping local interstellar medium with diffuse interstellar bands
Paunzen, Ernst; Piecka, Martin
With the use of the data from archives, we studied the correlations between the equivalent widths of four diffuse interstellar bands (4430, 5780, 5797, 6284 $\mathring{\rm A}$ ) and properties of the target stars (colour excess values, distances, and Galactic coordinates). Many different plots of the diffuse interstellar bands and their maps were …
An Information Theory Approach on Deciding Spectroscopic Follow-ups
Astudillo, Javiera; Protopapas, Pavlos; Pichara, Karim +1 more
Classification and characterization of variable phenomena and transient phenomena are critical for astrophysics and cosmology. These objects are commonly studied using photometric time series or spectroscopic data. Given that many ongoing and future surveys are conducted in a time domain, and given that adding spectra provides further insights but…
Kinematic Properties of Young Intermediate- and Low-Mass Stars from the Gaia DR2 Catalogue
Bobylev, V. V.; Bajkova, A. T.
We have studied the kinematic properties of young pre-main-sequence stars. We have selected these stars based on data from the Gaia DR2 catalogue by invoking a number of photometric infrared surveys. Using 4564 stars with parallax errors less than 20%, we have found the following parameters of the angular velocity of Galactic rotation: km s-1…
The Herschel SPIRE Fourier Transform Spectrometer Spectral Feature Finder - IV. Neutral carbon detection in the SPIRE FTS spectra
Valtchanov, Ivan; Scott, Jeremy P.; Spencer, Locke D. +2 more
The SPIRE Fourier Transform Spectrometer (FTS) Spectral Feature Finder (FF), developed within the Herschel Spectral and Photometric Imaging Receiver (SPIRE) FTS instrument team, is an automated spectral feature fitting routine that attempts to find significant features in SPIRE FTS spectra. The 3P1-3P0 a…
Magnetic and Velocity Field Topology in Active Regions of Descending Phase of Solar Cycle 23
Maurya, R. A.; Ambastha, A.
We analyze the topology of photospheric magnetic fields and sub-photospheric flows of several active regions (ARs) that are observed during the peak to descending phase of Solar Cycle 23. Our analysis shows clear evidence of hemispheric preferences in all the topological parameters such as the magnetic, current and kinetic helicities, and the `cur…