Search Publications
The impact of photospheric brightness field on exoplanetary transit timings and the TTV excess of HD 189733 b
Baluev, Roman V.
We consider the issue of excessive TTV noise observed for the exoplanet HD 189733 b. Trying to explain it through the host star photospheric activity, we model the stellar surface brightness as a random field, then characterize statistical properties of the resulting transit signal perturbation and compute individual corrections to transit timings…
Far-ultraviolet investigation into the galactic globular cluster M30 (NGC 7099) - II. Potential X-ray counterparts and variable sources
Zurek, David R.; Kroupa, Pavel; Long, Knox S. +4 more
We present a far-ultraviolet (FUV) study of the globular cluster M30 (NGC 7099). The images were obtained using the Advanced Camera for Surveys (ACS/SBC, F150LP, FUV) and the Wide Field Planetary Camera 2 (WFPC2; F300W, UV) on board the Hubble Space Telescope (HST). We compare the catalogue of FUV objects to 10 known X-ray sources and find six con…
Searching for shell stars in LAMOST DR4 by probing the Fe 42 multiplet lines
Paunzen, Ernst; Hümmerich, Stefan; Bernhard, Klaus
Shell stars, in particular the cooler ones, often do not show conspicuous Balmer-line emission and may consequently be missed in surveys that specifically search for emission signatures in the H α line. This work is aimed at identifying stars with shell-signatures via a search for strong Fe II multiplet 42 lines at λλ4924, 5018, 5169 Å in archival…
Supernova remnant W51C: optical and X-ray emission analysis
Rosado, M.; Arias, L.; Reyes-Iturbide, J. +4 more
We present observations of the optical and X-ray emission from the Galactic supernova remnant W51C. From [S II] Fabry-Pérot interferometry and H α and [S II] images we detect filaments that are part of the optical counterpart of the supernova remnant. We obtain the kinematic distance to W51C, showing that it is one of the shortest distances report…
Jet from the enigmatic high-latitude star BP Psc and evolutionary status of its driving source
Shakhovskoy, D. N.; Potravnov, Ilya S.; Khovritchev, M. Yu +1 more
BP Psc is an active late-type (sp:G9) star with unclear evolutionary status lying at high-galactic latitude b = -57°. It is also the source of the well collimated bipolar jet. We present results of the proper motion and radial velocity study of BP Psc outflow based on the archival Hα imaging with the GMOS camera at 8.1-m Gemini-North telescope as …
Two newly identified eclipsing binaries in open cluster NGC 3532
Özdarcan, O.
We present light-curve analyses of two newly identified detached eclipsing binaries, namely HD 96609 and HD 303734, in the region of the richly populated open cluster NGC 3532. HD 96609 is composed of two main sequence stars (B9-A0V + A2V) with masses and radii of M1 = 2.66 ± 0.02 M⊙, M2 = 1.84 ± 0.01 M⊙…
Adjusting the bow-tie: a morpho-kinematic study of NGC 40
López, J. A.; Estrada-Dorado, S.; Guerrero, M. A. +4 more
We present a comprehensive study of the ionization structure and kinematics of the planetary nebula (PN) NGC 40 (a.k.a. the Bow-tie Nebula). A set of narrow-band images obtained with the Alhambra Faint Object Spectrograph and Camera at the Nordic Optical Telescope are used to study the turbulent distribution of gas in the main cavity, the ionizati…
Analysis of Gaia radial-velocity standards: stability and new substellar companion candidates
Gosset, E.; Damerdji, Y.; Morel, T. +4 more
Our main aim is to test the non-variability of the radial velocity (RV) of a sample of 2351 standard stars used for wavelength calibration of the Radial Velocity Spectrometer (RVS) instrument onboard Gaia. In this paper, we present the spectroscopic analysis of these stars with the determination of their physical parameters by matching observed an…
Ammonia in the interstellar medium of a starbursting disc at z = 2.6
Ivison, R. J.; Menten, K. M.; Dye, S. +4 more
We report the detection of the ground state rotational emission of ammonia, ortho-NH3 (JK = 10 → 00) in a gravitationally lensed intrinsically hyperluminous star-bursting galaxy at z = 2.6. The integrated line profile is consistent with other molecular and atomic emission lines which have resolved kinema…
Insight-HXMT measurements of the diffuse X-ray background
Zhang, J.; Cui, W.; Zhang, S. +8 more
We present an X-ray spectrum of the diffuse X-ray background (DXRB) between 1.5 and 120 keV, as measured with the Low-Energy Detector (LE) and the High-Energy Detector (HE) aboard the Insight-HXMT satellite, based on 'blank-sky' observations. LE covers a nominal energy range of 1-15 keV and HE 20-250 keV, but calibration issues and data quality na…