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Variable stars in Palomar 13; an evaporating globular cluster
Arellano Ferro, A.; Muneer, S.; Giridhar, Sunetra +3 more
We present new CCD VI photometry of the distant globular cluster Pal 13. Fourier decomposition of the light curves of the three cluster member RRab stars lead to estimations of [Fe/H] = -1.65, and a distance of 23.67 ± 0.57 kpc. Light and colour near minimum phases for RRab stars leads to an estimate of E(B - V) = 0.104 ± 0.001. A V /(V - I) colou…
Recovering saturated images for high dynamic kernel-phase analysis. Application to the determination of dynamical masses for the system Gl 494AB
Beuzit, J. -L.; Laugier, R.; Martinache, F. +3 more
Kernel-phase observables extracted from mid- to high-Strehl images are proving to be a powerful tool to probe within a few angular resolution elements of point sources. The attainable contrast is limited, however, by the dynamic range of the imaging sensors. The Fourier interpretation of images with pixels exposed beyond the saturation has so far …
Circumstellar envelopes of semi-regular long-period variables: mass-loss rate estimates and general model fitting of the molecular gas
Alcolea, J.; Santander-García, M.; Bujarrabal, V. +4 more
Aims: We aim to study the main properties of a volume-limited unbiased sample of well-characterized semi-regular variables (SRs) in order to clarify important issues that need to be further explained, such as the formation of axially symmetric planetary nebulae (PNe) from spherical circumstellar envelopes (CSEs), which takes place during the …
NuSTAR Observations of the Unidentified INTEGRAL Sources: Constraints on the Galactic Population of HMXBs
Mori, Kaya; Hare, Jeremy; Stern, Daniel +3 more
The NuSTAR Legacy program titled Unidentified INTEGRAL Sources targeted faint hard X-ray sources revealed by INTEGRAL in the Galactic plane in order to provide conclusive identification of their nature and insights on the population of faint hard X-ray sources. The NuSTAR and Swift X-Ray Telescope observations obtained in 2015-2017 contributed to …
Primeval very low-mass stars and brown dwarfs - VII. The discovery of the first wide M + L extreme subdwarf binary
Zhang, ZengHua
I present the discovery of the first wide M + L extreme subdwarf binary system Gaia J0452-36AB. The binary is located at a distance of 137.27 ^{+0.68}_{-0.67} pc with a projected separation of 15828 ± 78 au. I classified Gaia J0452-36AB as esdM1 and esdL0 subdwarfs, respectively. Gaia J0452-36AB have typical halo kinematics, metallicity of [Fe/H] …
Visual Orbits of Spectroscopic Binaries with the CHARA Array. II. The Eclipsing Binary HD 185912
Gies, Douglas R.; Lester, Kathryn V.; Monnier, John D. +8 more
We present the visual orbit of the double-lined eclipsing binary, HD 185912, from long baseline interferometry with the CHARA Array. We also obtain echelle spectra from the Apache Point observatory to update the spectroscopic orbital solution and analyze new photometry from Burggraaff et al. to model the eclipses. By combining the spectroscopic an…
Implications of Philae Magnetometry Measurements at Comet 67P/Churyumov-Gerasimenko for the Nebular Field of the Outer Solar System
Auster, Hans-Ulrich; Heinisch, Philip; Glassmeier, Karl-Heinz +3 more
The remanent magnetization of solar system bodies reflects their accretion mechanism, the space environment in which they formed, and their subsequent geological evolution. In particular, it has been suggested that some primitive bodies may have formed large regions of coherent remanent magnetization as a consequence of their accretion in a backgr…
MARSWRF Prediction of Entry Descent Landing Profiles: Applications to Mars Exploration
Zorzano, María-Paz; Fonseca, Ricardo Morais; Martín-Torres, Javier
In this paper we use the Mars implementation of the Planet Weather Research and Forecasting model, MarsWRF, to simulate the Entry, Descent and Landing (EDL) vertical profiles from six past missions: Pathfinder, Mars Exploration Rovers Opportunity and Spirit, Phoenix, Mars Science Laboratory Curiosity rover, and ExoMars 2016 (Schiaparelli), and com…
Plasma Flows in the Cool Loop Systems
Wilhelm, Klaus; Rao, Yamini K.; Srivastava, Abhishek K. +2 more
We study the dynamics of low-lying cool loop systems for three data sets as observed by the Interface Region Imaging Spectrograph. Radiances, Doppler shifts, and line widths are investigated in and around observed cool loop systems using various spectral lines formed between the photosphere and transition region (TR). Footpoints of the loop thread…
Searching for Faint X-Ray Emission from Galactic Stellar Wind Bow Shocks
Binder, Breanna A.; Povich, Matthew S.; Behr, Patrick
We present a stacking analysis of 2.61 Ms of archival Chandra observations of stellar wind bow shocks. We place an upper limit on the X-ray luminosity of infrared-detected bow shocks of <2 × 1029 erg s-1, a more stringent constraint than has been found in previous archival studies and dedicated observing campaigns of nearb…