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Evolution of X-ray irradiation during the 1999-2000 outburst of the black hole binary XTE J1859 + 226
Done, Chris; Kimura, Mariko
X-ray irradiation in X-ray binaries is thought to control the behaviour at the outer disc, which is observable mainly at optical wavelengths. It is generally parametrized phenomenologically, but it can also be predicted from theoretical models of irradiated discs and their coronae/winds. We test these models using five multiwavelength Hubble Space…
SOFIA FORCAST Photometry of 12 Extended Green Objects in the Milky Way
Hunter, T. R.; Cyganowski, C. J.; Friesen, R. K. +2 more
Massive young stellar objects (MYSOs) are known to undergo an evolutionary phase in which high mass accretion rates drive strong outflows. A class of objects believed to trace this phase accurately is the Galactic Legacy Infrared Midplane Survey Extraordinaire (GLIMPSE) Extended Green Object (EGO) sample, so named for the presence of extended 4.5 …
Orbital and physical parameters of eclipsing binaries from the All-Sky Automated Survey catalogue. X. Three high-contrast systems with secondaries detected with IR spectroscopy
Tamura, M.; Kambe, E.; Niemczura, E. +14 more
Aims: We present results of the combined photometric and spectroscopic analysis of three detached eclipsing binaries, the secondary components of which are not visible or are very hard to identify in the optical spectra - ASAS J052743-0359.7, ASAS J065134-2211.5, and ASAS J073507-0905.7. The first one is the known visual binary ADS 4022, and …
A Double-modulation Effect Detected in a Double-mode High-amplitude δ Scuti Star: KIC 10284901
Esamdin, Ali; Yang, Tao-Zhi
In this paper, we present an analysis of the pulsating behavior of Kepler target KIC 10284901. The Fourier transform of the high-precision light curve reveals seven independent frequencies for its light variations. Among them, the first two frequencies are main pulsation modes: F0 = 18.994054(1) day-1 and F1 = 24.335804(4) day-1
Study of the mass-ratio distribution of spectroscopic binaries - II. The boundaries of the brown-dwarf desert as seen with the APOGEE spectroscopic binaries
Mazeh, T.; Shahaf, S.
Analysis of APOGEE DR12 stellar radial velocities by Troup et al. affirmed the existence of the well-known brown-dwarf desert (BDD). They detected a dearth of spectroscopic binaries (SB) with periods shorter than ∼10-30 d and secondaries with masses in the range of ∼0.01-0.1 M_{\odot }. We reconsider here their sample of binaries, focusing on 116 …
Characteristics of mid-infrared PAH emission from star-forming galaxies selected at 250 µm in the North Ecliptic Pole field
Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong Jin +11 more
Evolutionary properties of infrared (IR) luminous galaxies are important keys to understand dust-obscured star formation history and galaxy evolution. Based on near- to mid-IR imaging with nine continuous filters of the AKARI space telescope, we present the characteristics of dusty star-forming (SF) galaxies showing polycyclic aromatic hydrocarbon…
SuperWASP dispositions and false positive catalogue
Bouchy, F.; Deleuil, M.; Queloz, D. +32 more
SuperWASP, the Northern hemisphere WASP observatory, has been observing the skies from La Palma since 2004. In that time, more than 50 planets have been discovered with data contributions from SuperWASP. In the process of validating planets, many false-positive candidates have also been identified. The TESS telescope is set to begin observations o…
The HST large programme on NGC 6752 - III. Detection of the peak of the white dwarf luminosity function
Salaris, M.; Apai, D.; Anderson, J. +10 more
We report on the white dwarf (WD) cooling sequence of the old globular cluster NGC 6752, which is chemically complex and hosts a blue horizontal branch. This is one of the last globular cluster WD cooling sequences accessible to imaging by the Hubble Space Telescope. Our photometry and completeness tests show that we have reached the peak of the l…
The `Big Dipper': the nature of the extreme variability of the AGN SDSS J2232-0806
MacLeod, Chelsea L.; Landt, Hermine; Kynoch, Daniel +3 more
SDSS J2232-0806 (the `Big Dipper') has been identified as a `slow-blue nuclear hypervariable': a galaxy with no previously known active nucleus, blue colours, and large-amplitude brightness evolution occurring on a time-scale of years. Subsequent observations have shown that this source does indeed contain an active galactic nucleus (AGN). Our opt…
Searching for hot subdwarf stars from the LAMOST Spectra. II. Pure spectroscopic identification method for hot subdwarfs
Zhao, Gang; Németh, Péter; Zhao, Jingkun +2 more
Employing a new machine-learning method, named the hierarchical extreme learning machine (HELM) algorithm, we identified 56 hot subdwarf stars in the first data release (DR1) of the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) survey. The atmospheric parameters of the stars are obtained by fitting the profiles of hydrogen (H)…