Search Publications
A fractal analysis application of the pre-whitening technique to δ Scuti stars time series
Garrido, R.; Suárez, J. C.; de Franciscis, S. +4 more
Fractal fingerprints have been found recently in the light curves of several δ Scuti stars observed by Convection Rotation and planetary Transits(CoRoT) satellite. This sole fact might pose a problem for the detection of pulsation frequencies using classical pre-whitening techniques, but it is also a potentially rich source for information about p…
Young stars raining through the galactic halo: the nature and orbit of price-whelan 1
Martin, Nicolas; Malhan, Khyati; Ibata, Rodrigo A. +3 more
We present radial velocities for five member stars of the recently discovered young (age ≃ 100-150 Myr) stellar system Price-Whelan 1 (PW 1), which is located far away in the Galactic Halo (D≃ 29 kpc, Z≃ 15 kpc), and that is probably associated with the leading arm (LA) of the Magellanic Stream. We measure the systemic radial velocity of PW 1, V
A morphological study of galaxies in ZwCl0024+1652, a galaxy cluster at redshift z ∼ 0.4
Sánchez-Portal, Miguel; Pintos-Castro, Irene; Bongiovanni, Ángel +9 more
The well-known cluster of galaxies ZwCl0024+1652 at z ∼ 0.4 lacks an in-depth morphological classification of its central region. While previous studies provide a visual classification of a patched area, we used the public code called galaxy Support Vector Machine (GALSVM) and HST/ACS data as well as the WFP2 master catalogue to automatically clas…
Properties of jet and surrounding material of GW/GRB 170817A
Ziaeepour, Houri
We use published data in radio, optical, and X-ray bands to analyse and model afterglows of GW/GRB 170817A. Our analysis is based on a phenomenological gamma-ray burst generator model, which we previously used to study the prompt gamma-ray emission of this important transient. We find a multicomponent model and a few of its variants that are consi…
XRB continuum fitting with sensitive high-energy X-ray detectors
Fabian, A. C.; Tomsick, J. A.; Buisson, D. J. K. +4 more
The launch of the Nuclear Spectroscopic Telescope Array (NuSTAR) heralded a new era of sensitive high-energy X-ray spectroscopy for X-ray binaries (XRBs). In this paper we show how multiple physical parameters can be measured from the accretion disc spectrum when the high-energy side of the disc spectrum can be measured precisely using NuSTAR. Thi…
GK Car and GZ Nor: two low-luminous, depleted RV Tauri stars
Gezer, I.; Van Winckel, H.; Kamath, D. +1 more
We performed a photometric and spectroscopic analysis of two RV Tauri stars: GK Car and GZ Nor. Both objects are surrounded by hot circumstellar dust. Their pulsation periods, derived from ASAS (All Sky Automated Survey) photometric time-series, have been used to derive their luminosities and distances via the period-luminosity-distance (PLC) rela…
Candidates for non-pulsating stars located in the Cepheid instability strip in the Large Magellanic Cloud based on Strömgren photometry
Soszyński, I.; Smolec, R.; Udalski, A. +14 more
We present candidates for non-pulsating stars lying in the classical Cepheid instability strip based on the Optical Gravitational Lensing Experiment (OGLE) photometric maps combined with Strömgren photometry obtained with the 4.1-m Southern Astrophysical Research (SOAR) telescope, and Gaia Data Release 2 data in four fields in the Large Magellanic…
Outflowing gas in a compact ionization cone in the Seyfert 2 galaxy ESO 153-G20
Robinson, Andrew; Fischer, Travis C.; Schnorr-Müller, Allan +14 more
We present two-dimensional ionized gas and stellar kinematics in the inner 1.4 × 1.9 kpc2 of the Seyfert 2 galaxy ESO 153-G20 obtained with the Gemini-South/Gemini multi-object spectrograph integral field unit (GMOS-IFU) at a spatial resolution of 250 pc and spectral resolution of 36 km s-1. Strong [O III], Hα, [N II] and [S …
Dust evolution in the circumstellar disc of the unclassified B[e] star HD 50138
Ábrahám, P.; Chen, L.; Varga, J. +3 more
We studied the disc of the unclassified B[e] star HD 50138 in order to explore its structure and to find indications for the evolutionary status of this system, whether it is a young Herbig Be or a post-main-sequence star. Using high spatial resolution interferometric measurements from MIDI instrument (N-band) on the Very Large Telescope Interfero…
Molecular environs and triggered star formation around the large Galactic infrared bubble N 24
Li, Dalei; Tang, Xindi; Zhou, Jianjun +10 more
A multi-wavelength analysis of the large Galactic infrared bubble N 24 is presented in this paper in order to investigate the molecular and star-formation environment around expanding H II regions. Using archival data from Herschel and ATLASGAL, the distribution and physical properties of the dust over the entire bubble are studied. Using the Clum…