Search Publications
Stellar chromospheric activity database of solar-like stars based on the LAMOST Low-Resolution Spectroscopic Survey. II. The bolometric and photospheric calibration
Zhang, Jun; Zhang, Haotong; Luo, Ali +2 more
Context. The dependence of stellar magnetic activity on stellar parameters is inspired by the chromospheric activity studies based on the large-scale spectroscopic surveys.
Aims: The main objective of this project is to provide the chromospheric activity parameter database for the LAMOST Low-Resolution Spectroscopic Survey (LRS) spectra of so…
Evolving Outer Heliosphere: Tracking Solar Wind Transients from 1 au to the VLISM with IBEX and Voyager 1
Reisenfeld, D. B.; McComas, D. J.; Rankin, J. S. +5 more
Interstellar Boundary Explorer (IBEX) observations of energetic neutral atom (ENA) fluxes from the heliosphere have greatly enriched our understanding of the interaction of the solar wind (SW) with the local interstellar medium (LISM). However, there has been recent controversy surrounding the inability of most ENA models to produce as high an int…
The Resonant Structure of xGEO and Implications for Cislunar Domain Awareness
Rawat, A.; Rosengren, A.; Ross, S. +1 more
A rigorous dynamical definition for xGEO is the critical distance at which the secular contributions from the lunisolar perturbations exceed those from Earth oblateness, known in astronomical parlance as the Laplace radius. xGEO fundamentally represents a restricted four-body problem (R4BP), which can be approached locally using the perturbed-Hami…
The overflowing atmosphere of WASP-121 b: High-resolution He I λ10833 transmission spectroscopy with VLT/CRIRES+
Czesla, S.; Nortmann, L.; Reiners, A. +14 more
Transmission spectroscopy is a prime method to study the atmospheres of extrasolar planets. We obtained a high-resolution spectral transit time series of the hot Jupiter WASP-121 b with CRIRES+ to study its atmosphere via transmission spectroscopy of the He I λ10833 triplet lines. Our analysis shows a prominent He I λ10833 absorption feature movin…
Low-redshift absorption in the Seyfert galaxy PG1211+143 - a distant inflow maintaining off-plane accretion or the gravitational redshift of matter orbiting the SMBH?
Page, Kim; Pounds, Ken
The detection of a high-velocity (~0.3c) inflow of highly ionized matter during an extended XMM-Newton observation of the luminous Seyfert galaxy PG1211+143 in 2014 provided the first direct evidence of a short-lived accretion event, and an explanation for the powerful winds (UFOs) now recognized as a common property of many luminous Seyfert galax…
White Dwarf Photospheric Abundances in Cataclysmic Variables. IV. Deriving the [N/C] Ratio
Sion, Edward M.; Godon, Patrick
We present results from our ongoing far-ultraviolet archival analysis of cataclysmic variable white dwarf (WD) abundances for six more systems: four SU UMa dwarf novae (BW Scl, SW UMa, BC UMa, and VW Hyi) together with the dwarf nova RX And, and the novalike DW UMa. To derive a reliable nitrogen abundance, for the four SU UMa systems (with a WD te…
Apparent non-variable stars from the Kepler mission
Schmidt, K.; Paunzen, E.; Maitzen, H. M. +12 more
Context. The analysis of non-variable stars is generally neglected in the literature. However, such objects are needed for many calibration processes and for testing pulsational models. The photometric time series of the Kepler satellite mission still stand as the most accurate data available today and are excellently suited to the search for non-…
Catalog of Variable Stars in the WD 0009\boldsymbol{+} \boldsymbol{+}
Galazutdinov, G. A.; Beskin, G. M.; Romanyuk, I. I. +15 more
The light curves for almost 50 thousand stars with magnitudes
Synthetic light curves and orbital solutions of two eclipsing binary systems, V675 Lac and USNO-A2.0 1425-02035807
Elkhateeb, M. M.; Alenazi, M. S.
We carried out light curve modeling for all-light curves of the variable W UMa systems V675 Lac and USNO-2035807 using ground-based observations, the Gaia 3rd data release, and ZTF databases by means of the W-D code. The accepted models revealed absolute and physical parameters, which showed that the primary components in both systems are massive …
Exocomet orbital distribution around β Pictoris
Heller, René
The ~23 Myr young star β Pictoris (β Pic) is a laboratory for planet formation studies because of its observed debris disk, its directly imaged super-Jovian planets β Pic b and c, and the evidence of extrasolar comets that regularly transit in front of the star. The most recent evidence of exocometary transits around β Pic came from stellar photom…