Search Publications
Missions
Journals
Publication Years
Detection of the Temperature Dependence of the White Dwarf Mass–Radius Relation with Gravitational Redshifts
Hermes, J. J.; Zakamska, Nadia L.; Gänsicke, Boris T. +8 more
Models predict that the well-studied mass–radius relation of white dwarf stars depends on the temperature of the star, with hotter white dwarfs having larger masses at a given radius than cooler stars. In this paper, we use a catalog of 26,041 DA white dwarfs observed in Sloan Digital Sky Survey Data Releases 1–19. We measure the radial velocity, …
Light curves for 10 R Coronae Borealis stars for longer than a century: secular evolution, dip statistics, and a general model for the shape of isolated light-curve dips
Schaefer, Bradley E.
R Coronae Borealis stars (RCBs) are cool supergiants that display non-periodic deep dips in brightness. Recently, a group of 'Hot RCB stars' has been discovered to be fast evolving across the HR (Hertzsprung-Russell) diagram, as these stars leave the RCB region, with brightness changes at the rate of ~1 mag per century. Perhaps cool RCB stars can …
Orbits and dynamical masses for the active Hyades multiple system HD 284163
Torres, Guillermo; Latham, David W.; Monnier, John D. +16 more
We report near-infrared long-baseline interferometric observations of the Hyades multiple system HD 284163, made with the Center for High Angular Resolution Astronomy array, as well as almost 43 yr of high-resolution spectroscopic monitoring at the Center for Astrophysics. Both types of observations resolve the 2.39 d inner binary, and also an out…
Investigation of [KSF2015] 1381-19L, a WC9-type Star in the High-extinction Galactic Region
Baug, Tapas; Das, Ramkrishna; Kar, Subhajit
We report on a multiwavelength study of the Wolf–Rayet star [KSF2015] 1381-19L, which is located in the solar metallicity region (Z = 0.014) of the Milky Way, strongly obscured by interstellar dust. We perform a detailed characterization of the stellar atmosphere by fitting the spectral emission lines observed in the optical and near-infrared (NIR…
Scalar-Potential Mapping Of The Steady-State Magnetosheath Model
Toepfer, Simon; Narita, Yasuhito; Schmid, Daniel
The steady-state magnetosheath model has various applications for studying the plasma and magnetic field profile around the planetary magnetospheres. In particular, the magnetosheath model is analytically obtained by solving the Laplace equation for parabolic boundaries (bow shock and magnetopause). We address the question, how can we utilize the …
High-resolution spectroscopy of detached eclipsing binaries during total eclipses
Hełminiak, K. G.; Olszewska, J. M.; Pawar, T. +1 more
Context. We present results of high-resolution spectroscopic observations of detached eclipsing binaries (DEBs) with total eclipses, for which UVES spectra were obtained during the phase of totality. These observations serve as a key way to determine the age and initial metallicity of the systems and to verify evolutionary phases of their componen…
Exploring sensitivity: Unveiling the impact of input parameters on Venus ionosphere V2 layer characteristics
Choudhary, R. K.; Ambili, K. M.; Tripathi, Keshav R.
This study investigates the impact of model input parameters on the characteristic features of the dayside V2 layer in the Venus ionosphere using an in-house developed one-dimensional photochemical model (1D-PCM) and observations from Venus Express radio science experiments (VeRa). 1D-PCM is simulated for different combinations of neutr…
The AstroSat UV Deep Field North: The IRX–β Relation for the UV-selected Galaxies at z ∼ 0.5‑0.7
Saha, Kanak; Mondal, Chayan
The relation between the observed UV continuum slope (β) and the infrared excess (IRX) is used as a powerful probe to understand the nature of dust attenuation law in high-redshift galaxies. We present a study of 83 UV-selected galaxies between a redshift of 0.5 and 0.7 from the AstroSat UV Deep Field north that encloses the GOODS-North field. Usi…
The Hubble Deep Hydrogen Alpha (HDHα) Project. I. Catalog of Emission-line Galaxies
Jiang, Linhua; Fang, Guanwen; Zheng, Zhen-Ya +14 more
We present the first results of the Hubble Deep Hydrogen Alpha (HDHα) project, which analyzes the space-borne deep Hα narrowband imaging data in the GOODS-S region. The HDHα data comprises 72 orbits' images taken with the Hubble Space Telescope (HST) Advanced Camera for Surveys/Wide Field Channel F658N filter. The exposure time varies across a tot…
Calibration and Release of Magnetograms/Dopplergrams Obtained at the Mt. Wilson 150-Foot Tower Telescope (MWO)
Ulrich, Roger K.; Boyden, John; Tran, Tham
The Mt. Wilson Observatory archive of observations of solar disk magnetic fields, Doppler velocities, and spectral line intensities is a resource for studying the Sun's state from 1967 to 2013. Instrument changes/upgrades during this time must be considered when interpreting this record. Portions of this record have been previously released. This …