Search Publications
Spatio-spectral-temporal modelling of two young pulsar wind nebulae
Venter, C.; Torres, Diego F.; Sushch, I. +5 more
Recent observations of a few young pulsar wind nebulae (PWNe) have revealed their morphologies in some detail. Given the availability of spatio-spectral-temporal data, we use our multi-zone (1D) leptonic emission code to model the PWNe associated with G29.7
A detailed chemical study of the extreme velocity stars in the galaxy
Wyse, Rosemary F. G.; Hawkins, Keith; Reggiani, Henrique +3 more
Two decades on, the study of hypervelocity stars is still in its infancy. These stars can provide novel constraints on the total mass of the Galaxy and its dark matter distribution. However how these stars are accelerated to such high velocities is unclear. Various proposed production mechanisms for these stars can be distinguished using chemo-dyn…
A study of chemical abundances, rotational velocities, and orbital elements in single-lined spectroscopic binary stars in open clusters
Pereira, C. B.; Holanda, N.; Drake, N. A. +4 more
Binary interactions play a significant role in stellar evolution. In this study, we present a comprehensive analysis of 17 single-lined spectroscopic binary stars and identify two more as 'yellow stragglers', in the context of 15 young open clusters with ages younger than 1.0 Gyr. High-resolution spectroscopy ($R\, \approx \, 48000$) was employed …
Carbon- and Oxygen-rich stars in MaStar: identification and classification
Hill, Lewis; Thomas, Daniel; Maraston, Claudia +5 more
Carbon- and Oxygen-rich stars populating the Thermally Pulsing Asymptotic Giant Branch (TP-AGB) phase of stellar evolution are relevant contributors to the spectra of ~1 Gyr old populations. Atmosphere models for these types are uncertain, due to complex molecules and mass-loss effects. Empirical spectra are then crucial, but samples are small due…
GMRT observations of the radio trail from CXOU J163802.6-471358
Roy, S.; Green, D. A.
The X-ray source CXOU J163802.6-471358 is thought to be a pulsar wind nebula (PWN), as it shows an extended, ≈40 arcsec trail from a compact source. Here, we present Giant Metrewave Radio Telescope observations of this source at 330 and 1390 MHz, which reveal a remarkable linear radio trail ≈90 arcsec in extent. Although the radio trail points bac…
Do anomalously dense hot Jupiters orbit stealth binary stars?
Wilson, Thomas G.; Collier Cameron, Andrew; Goswamy, Tanvi
The Wide Angle Search for Planets (WASP) survey used transit photometry to discover nearly 200 gas-giant exoplanets and derive their planetary and stellar parameters. Reliable determination of the planetary density depends on accurate measurement of the planet's radius, obtained from the transit depth and photodynamical determination of the stella…
Eruption of prominence initiated by loss of equilibrium: multipoint observations
Vemareddy, P.; Ibrahim, M. Syed
Using the SDO/AIA, SOHO/LASCO, STEREO/SECCHI, and ground-based H α, radio observations, we studied a prominence eruption (PE) from the western limb that occurred on 2013 December 4. PE is associated with a moderate coronal mass ejection (CME) and GOES class C4.7 flare. Before a couple of days, the prominence pre-existed as an inverse-S shaped fila…
The Interaction Jigsaw: investigating star formation in interacting galaxies
Mathew, Blesson; Kartha, Sreeja S.; Shridharan, B. +5 more
Interaction between galaxies plays a pivotal role in their evolution. Ongoing star formation in spiral galaxies can be affected by these processes. Interacting galaxy pairs provide an opportunity to study these effects. We select a sample of interacting galaxies in field environments at various interaction stages and are nearly face-on and chose g…
The spatially resolved relation between dust, gas, and metal abundance with the TYPHOON survey
Kewley, Lisa J.; Madore, Barry F.; Beaton, Rachael L. +12 more
We present the spatially resolved relationship between the dust-to-gas mass ratio (DGR) and gas-phase metallicity (
Comparing Gaia, NED, and SIMBAD source classifications in nearby galaxies
Hales, J.; Barmby, P.
Gaia Data Release 3 (DR3) provides the first classifications for the sources in Gaia's all-sky database. Most Gaia sources are stars in the Milky Way, but DR3 also contains many sources that belong to nearby galaxies, as well as background galaxies and quasars. In this work, we compare the Gaia classifications from the Discrete Source Classifier (…