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Gaia DR2 and EDR3 data and evolutionary status of post-AGB stars with high radial velocities
Matsuno, Tadafumi; Aoki, Wako; Parthasarathy, Mudumba
Using the Gaia Data Release 2 (DR2) and Early Data Release 3 (EDR3) data and list of post-AGB candidates, we investigate the parallax, proper motion, and binarity for 20 post-AGB stars and candidates that have high radial velocities. From their Gaia distances, their luminosities and kinematics are derived. The evolutionary status of these stars is…
The Small Separation A-star Companion Population: First Results with CHARA/MIRC-X
Lanthermann, Cyprien; Anugu, Narsireddy; Kraus, Stefan +9 more
We present preliminary results from our long-baseline interferometry (LBI) survey to constrain the multiplicity properties of intermediate-mass A-type stars within 80 pc. Previous multiplicity studies of nearby stars exhibit orbital separation distributions well fitted with a lognormal with peaks >15 au, increasing with primary mass. The A-star…
Identification and Parameter Determination of F-type Herbig Stars from LAMOST DR8
Luo, A. -Li; Hou, Wen; Jiang, Biwei +5 more
We identify 20 F-type Herbig stars and provide a list of 22 pre-main-sequence candidates from LAMOST DR8. The effective temperature, distance, extinction, stellar luminosity, mass, age, and radius are derived for each Herbig star based on optical spectra, photometry, Gaia EDR3 parallaxes, and pre-main-sequence evolutionary tracks. According to spe…
Evolved eclipsing binary systems in the Galactic bulge: Precise physical and orbital parameters of OGLE-BLG-ECL-305487 and OGLE-BLG-ECL-116218
Smolec, R.; Thompson, I. B.; Villanova, S. +17 more
Aims: Our goal is to determine, with high accuracy, the physical and orbital parameters of two double-lined eclipsing binary systems, where the components are two giant stars. We also aim to study the evolutionary status of the binaries, to derive the distances towards them by using a surface brightness-colour relation, and to compare these m…
CORALIE radial velocity search for companions around evolved stars (CASCADES). II. Seismic masses for three red giants orbited by long-period massive planets
Buldgen, G.; Eggenberger, P.; Ségransan, D. +10 more
Context. The advent of asteroseismology as the golden path to precisely characterize single stars naturally led to synergies with the field of exoplanetology. Today, the precise determination of stellar masses, radii and ages for exoplanet-host stars is a driving force in the development of dedicated software and techniques to achieve this goal. H…
Development of Chaos Terrain as Subaqueous Slide Blocks in Galilaei Crater, Mars
Nizam, Nabila; Divola, Claire; Day, Mackenzie +2 more
Chaos terrain, expressed as enigmatic blocky landscapes on Mars, has poorly understood origins. Several hypotheses have been put forward to explain chaos terrain formation, but none fully account for the morphologies observed in Galilaei crater, the focus of this study. Previously inferred to be a paleolake, Galilaei crater hosts chaos terrain com…
The evolutionary state of the chemically peculiar members of the open cluster NGC 2516
Hubrig, S.; Schöller, M.; Piskunov, A. E. +1 more
We aim at establishing safe membership and evolutionary status of 11 chemically peculiar (CP) stars that are residing in the domain of the open cluster NGC 2516 and are frequently referred to as cluster members. We queried the Gaia EDR3 catalogue in an area with a radius of 1° and selected 37 508 stars brighter than G = 19 mag. The cluster members…
Improving Multiday Solar Wind Speed Forecasts
Arge, C. N.; Henney, C. J.; Dayeh, M. A. +4 more
We analyze the residual errors for the Wang-Sheeley-Arge (WSA) solar wind speed forecasts as a function of the photospheric magnetic field expansion factor (fp) and the minimum separation angle (d) in the photosphere between the footpoints of open field lines and the nearest coronal hole boundary. We find the map of residual speed error…
C,T1,T2: A Complementary Method to Detect Multiple Populations with the Washington Filter System
Geisler, D.; Villanova, S.; Frelijj, H. +1 more
In this research we test the ability of a three Washington filter combination, (C − T1) − (T1 − T2), compared with that of the traditional C − T1 color to find multiple populations on two globular clusters: NGC 7099 and NGC 1851, types I and II Globular clusters, respectively. Our improved photometry and…
XMM-Newton detection of soft time lags in the TDE candidate AT 2018fyk
Zhang, Wenda
In this letter, we report a tentative detection of soft time lags (i.e. variability of softer photons lags behind the variability of harder photons) in one XMM-Newton observation of the tidal disruption event (TDE) candidate AT 2018fyk while the source was in the hard spectral state. The lags are detected at $6.51\times 10^{-5}~\rm Hz$. The amplit…