Search Publications
X-ray and radio studies of SNR CTB 37B hosting the magnetar CXOU J171405.7-381031
Safi-Harb, Samar; Kothes, Roland; Gotthelf, Eric V. +2 more
We present a Chandra and XMM-Newton study of the supernova remnant (SNR) CTB 37B, along with archival radio observations. In radio wavelengths, the SNR CTB 37B is an incomplete shell showing bright emission from the eastern side, while the X-ray morphology shows diffuse emission from regions surrounding the magnetar CXOU J171405.7-381031. We used …
Multifractal detrended moving average analysis of Kepler stars with surface differential rotation traces
De Medeiros, J. R.; de Freitas, D. B.; Das Chagas, M. L. +2 more
A multifractal formalism is employed to analyse high-precision time-series data of Kepler stars with surface differential rotation (DR) traces. The multifractal detrended moving average (MFDMA) algorithm has been explored to characterize the multiscale behaviour of the observed time series from a sample of 662 stars selected with parameters close …
SN 2016B a.k.a. ASASSN-16ab: a transitional Type II supernova
Pandey, S. B.; Benetti, S.; Kumar, Brajesh +12 more
We present photometry, polarimetry, and spectroscopy of the Type II supernova ASASSN-16ab/SN 2016B in PGC 037392. The photometric and spectroscopic follow-up commenced about 2 weeks after shock breakout and continued until nearly 6 months. The light curve of SN 2016B exhibits intermediate properties between those of Type IIP and IIL. The early dec…
On ancient solar-type stars
Fuhrmann, Klaus; Chini, Rolf
We describe a survey of ancient solar-type stars down to main-sequence effective temperatures Teff ≥ 5300 K and within 42 pc of the Sun. The underlying Gaia-based, volume-complete parent sample consists of 1633 sources, dominated by Population I. The design of the survey is such that around 130 sources are expected to be members of Popu…
Optical counterparts of an ultraluminous X-Ray Source X-1 in NGC 2500
Akyuz, A.; Aksaker, N.; Avdan, S. +1 more
We present the results of a search for optical counterparts of ultraluminous X-ray source (ULX) X-1 in the nearby galaxy NGC 2500 by using archival images taken with the Hubble Space Telescope Wide Field Camera (WFC3)/UVIS. We identified four optical sources as possible counterparts within the 2σ error radius of 0^' ' }.3 in the images.…
A Magellanic origin for the Virgo sub-structure
Belokurov, V.; Iorio, G.; Erkal, D. +1 more
The Milky Way halo has been mapped out in recent work using a sample of RR Lyrae stars drawn from a cross-match of Gaia with 2MASS. We investigate the significant residual in this map which we constrain to lie at Galactocentric radii 12 < R < 27 kpc and extend over 2600 deg2 of the sky. A counterpart of this structure exists in bo…
The young star population of Lynds 1188
Kun, M.; Marton, G.; Szegedi-Elek, E. +2 more
We present new results on the young star population of the Lynds 1188 molecular cloud, which is associated with the Cepheus Bubble, a giant interstellar shell around the association Cep OB 2. In order to reveal the star-forming scenario of the molecular cloud located on the supershell, and to understand the history of star formation in the region,…
The nearby evolved stars survey - I. JCMT/SCUBA-2 submillimetre detection of the detached shell of U Antliae
Ventura, Paolo; Goldman, Steven R.; Boyer, Martha L. +24 more
We present the highest resolution single-dish submillimetre observations of the detached shell source U Antliae to date. The observations were obtained at 450 and 850 {µ}m with SCUBA-2 instrument on the James Clerk Maxwell Telescope as part of the Nearby Evolved Stars Survey. The emission at 850 {µ}m peaks at 40 arcsec with hints of a …
On the origin of the dramatic spectral variability of WPVS 007
Xue, Yongquan; Li, Junyao; Wang, Tinggui +2 more
We report the discovery of large-amplitude mid-infrared variabilities (MIR; ∼0.3 mag) in the Wide-field Infrared Survey Explorer W1 and W2 bands of the low-luminosity narrow-line Seyfert 1 galaxy WPVS 007, which exhibits prominent and varying broad-absorption lines (BALs) with blueshifted velocity up to {∼ } 14 000km s^{-1}. The observed significa…
Physical properties of the fullerene C60-containing planetary nebula SaSt2-3
Otsuka, Masaaki
We perform a detailed analysis of the fullerene C60-containing planetary nebula (PN) SaSt2-3 to investigate the physical properties of the central star (B0-1II) and nebula based on our own Subaru/HDS spectra and multiwavelength archival data. By assessing the stellar absorption, we derive the effective temperature, surface gravity, and …