Search Publications
Testing Cluster Membership of Planetary Nebulae with High-precision Proper Motions. II. HST Observations of PHR J1315–6555 in the Open Cluster AL 1 (ESO 96-SC04)
Bond, Howard E.; Sahu, Kailash C.; Bellini, Andrea
Planetary nebulae (PNe) shown to be members of star clusters provide information on their properties and evolutionary histories that cannot be determined for PNe in the field, in particular the initial masses of their progenitor stars. Here we investigate the bipolar PN PHR J1315‑6555 (hereafter PHR J1315), which lies near the open cluster AL 1 (E…
Candidate RR Lyrae Associated with the Ultrafaint Dwarf Galaxy Aquarius III
Ngeow, Chow-Choong; Bhardwaj, Anupam
We report the search of RR Lyrae in the vicinity of a newly discovered ultrafaint dwarf galaxy, Aquarius III. Based on the known RR Lyrae catalogs and gri-band light curves retrieved from public archives, we identified a RR Lyrae with distance, metallicity, and proper motion consistent with Aquarius III. Therefore, this RR Lyrae is the first varia…
Precise Orbit Determination of Mars-crossing Asteroids
Liu, Xin; Hou, Xi-Yun; Yao, Jun +4 more
This study investigates the orbit determination of the Mars-crossing asteroids (MCAs) with a focus on the possibility of detecting their Yarkovsky signals. We analyze the influences of force model uncertainties on MCA orbits, including the uncertainty of the main asteroid belt, and the uncertainty of the major planets' ephemeris. The main asteroid…
Resolving Pleiades Binary Stars with Gaia and Speckle Interferometric Observations
Chulkov, Dmitry; Strakhov, Ivan; Safonov, Boris
The Pleiades is the most prominent open star cluster visible from Earth and an important benchmark for simple stellar populations unified by common origin, age, and distance. Binary stars are its essential ingredient, yet their contribution remains uncertain due to heavy observational biases. A resolved multiplicity survey was conducted for a magn…
starkiller: Subtracting Stars and Other Sources from IFU Spectroscopic Data Through Forward Modeling
Bannister, Michele T.; Nordlander, Thomas; Ridden-Harper, Ryan +1 more
We present starkiller, an open-source Python package for forward-modeling flux retrieval from integral field unit (IFU) spectrograph data cubes. starkiller simultaneously provides stellar spectral classification, relative velocity, and line-of-sight extinction for all sources in a catalog, alongside a source-subtracted data cube. It performs synth…
Characterizing Superflares in HR 1099 Using Temporal and Spectral Analysis of XMM-Newton Observations
Srivastava, A. K.; Pandey, Jeewan C.; Didel, Shweta
In the present paper, we analyze three energetic X-ray flares from the active RS CVn binary HR 1099 using data obtained from XMM-Newton. The flare duration ranges from 2.8 to 4.1 hr, with e-folding rise and decay times in the range of 27–38 minutes and 1.3–2.4 hr, respectively, indicating rapid rise and slower decay phases. The flare frequency for…
A Bayesian Approach to Inferring Accretion Signatures in Young Stellar Objects: A Case Study with VIRUS
Mahadevan, Suvrath; Janowiecki, Steven; Zeimann, Gregory R. +3 more
The mass accretion rates of young stellar objects (YSOs) are key to understanding how stars form, how their circumstellar disks evolve, and even how planets form. We develop a Bayesian framework to determine the accretion rates of a sample of 15 YSOs using archival data from the VIRUS spectrograph (R ∼ 800, 3500–5500 Å) on the Hobby–Eberly Telesco…
Identifying Hierarchically Triple Star Systems with Gaia DR3 and LAMOST
Han, Zhanwen; Kovalev, Mikhail; Chen, Xuefei +8 more
Triple star systems are critical for understanding stellar dynamics and compact objects in astrophysics, yet confirmed hierarchical triples identified via spectroscopy remain limited. In this study, we identified 23 triple systems by cross matching the Gaia DR3 non-single-star catalog with Large Sky Area Multi-Object Fiber Spectroscopic Telescope …
New Ultracool Companions to Nearby White Dwarfs
Debes, John H.; Meisner, Aaron M.; Kirkpatrick, J. Davy +15 more
We conducted a search for new ultracool companions to nearby white dwarfs using multiple methods, including the analysis of colors and examination of images in both the optical and the infrared. Through this process, we identified 51 previously unrecognized systems with candidate ultracool companions. 31 of these systems are resolved in at least o…
A Centroiding Algorithm for Point-source Trails
Rambaux, Nicolas; Lainey, Valéry; Cooper, Nick +3 more
Astrometric measurements are significantly challenged by the relative motion between the point source and the telescope, primarily due to the difficulty in accurately determining the position of the point source at the mid-exposure moment. Especially when the trail is irregular in shape or results from nonuniform relative motion, determining the c…