Search Publications
Making waves in massive star asteroseismology
Bowman, Dominic M.
Massive stars play a major role not only in stellar evolution but also galactic evolution theory. This is because of their dynamical interaction with binary companions, but also because their strong winds and explosive deaths as supernovae provide chemical, radiative and kinematic feedback to their environments. Yet this feedback strongly depends …
Detection of wide binary and multiple nuclei of planetary nebulae using the Gaia DR3
Ali, A.; Khalil, J. M.; Mindil, A.
Context: this paper describes the detection of wide binary and multiple central stars (CSs) of Galactic planetary nebulae (PNe) using the most up-to-date data available from the Gaia Data Release 3 (Gaia DR3). Aims: the objective of this study is to benefit from the Gaia DR3's reliable measurements of parallax and proper motion to reveal the binar…
Fabry-Pérot etalons in solar astronomy. A review
del Toro Iniesta, J. C.; Orozco Suárez, D.; Bailén, F. J.
During the last decades, the use of Fabry-Pérot etalons as filtergraphs has become frequent in solar instruments. The main reason is that they stand out for offering quasi-monochromatic, two-dimensional fields of view much higher than those provided by conventional slit-based spectrographs in a given time interval. Unfortunately, they also present…
Variable stars in the field of the Galactic bulge globular cluster NGC 6522
Arellano Ferro, A.; Luna, A.; Prudil, Z. +2 more
We present a comprehensive analysis of the variable stars projected on the field of the Galactic bulge globular cluster NGC 6522, offering valuable insights into their characteristics. Using proper motions from Gaia-DR3, we aim to distinguish between field stars and true cluster members. For an accurate color-magnitude diagram of the member stars,…
Revealing the atmospheres of highly irradiated exoplanets: from ultra-hot Jupiters to rocky worlds
Mansfield, Megan
Spectroscopy of transiting exoplanets has revealed a wealth of information about their atmospheric compositions and thermal structures. In particular, studies of highly irradiated exoplanets at temperatures much higher than those found in our solar system have provided detailed information on planetary chemistry and physics because of the high lev…
A clustering study of the old open cluster Trumpler 19
Gao, Xinhua; Fang, Dan
In this paper, we investigate the spatial structure and dynamical state of the poorly studied old (
Radio and mid-infrared properties of the blazar J1419–0838
Frey, Sándor; Gabányi, Krisztina Éva; Perger, Krisztina
The radio quasar NVSS J141922‑083830 (J1419‑0838) was initially classified as an uncategorised blazar-type object, following its detection in the
Comprehensive study of the Galactic Planetary Nebula NGC 2792
Ali, A.; Snaid, S.; Alruhaili, A.
This paper describes integral field unit (IFU) spectroscopic observations of the Galactic planetary nebula (PN) NGC 2792. The physical conditions, chemical composition, and kinematic properties are discussed and found to be in good agreement with prior long-slit-based investigations. The intensity of the He II line indicates that the nebula is of …
Analysis of photospheric magnetic fields in AR 12546: a case study
Abdelkawy, Ali G. A.; Shaltout, Abdelrazek M. K.
We investigate high-resolution observations with the spectropolarimeter (SP) aboard the Hinode satellite of the Solar Optical Telescope (SOT) of a positive polarity sunspot of an active region (AR) (NOAA 12546). We present a case study for the properties of the thermal, magnetic field, and plasma flows as a function of the optical depth from the i…
First investigations of 14 neglected, late-type contact binaries
M, Raghu Prasad; Jagirdar, Rukmini; Devarapalli, Shanti Priya
In the current work we present the first investigations of 14 neglected, late-type, short period contact binaries using period variation, photometric and spectroscopic analysis performed on long term space and ground based observations. The binaries in study belong to spectral classes F to K. In this study the two contact binaries TIC 242100930 an…