Search Publications
Orbital Monitoring of the AstraLux Large M-dwarf Multiplicity Sample
Henning, Thomas; Brandner, Wolfgang; Schlieder, Joshua +6 more
Orbital monitoring of M-type binaries is essential for constraining their fundamental properties. This is particularly useful in young systems, where the extended pre-main-sequence evolution can allow for precise isochronal dating. Here, we present the continued astrometric monitoring of the more than 200 binaries of the AstraLux Large Multiplicit…
SiO and H2O Maser Survey toward Post-asymptotic Giant Branch and Asymptotic Giant Branch Stars
Kim, Jaeheon; Cho, Se-Hyung; Yoon, Dong-Hwan +2 more
We performed simultaneous observations of SiO v = 1, 2, 29SiO v = 0, J = 1-0 and H2O 616-523 maser lines toward 143 AGB and 164 post-asymptotic giant branch (AGB) stars in order to investigate how evolutionary characteristics from AGB to post-AGB stars appear in both SiO and H2O maser emission…
Photometric Redshifts in the Hawaii-Hubble Deep Field-North (H-HDF-N)
Lehmer, B. D.; Alexander, D. M.; Bauer, F. E. +11 more
We derive photometric redshifts (z phot) for sources in the entire (~0.4 deg2) Hawaii-Hubble Deep Field-North (H-HDF-N) field with the EAzY code, based on point-spread-function-matched photometry of 15 broad bands from the ultraviolet (U band) to mid-infrared (IRAC 4.5 µm). Our catalog consists of a total of 131,678 sou…
J- and H-band Imaging of AKARI North Ecliptic Pole Survey Field
Im, Myungshin; Matsuhara, Hideo; Lee, Hyung Mok +2 more
We present the J- and H-band source catalog covering the AKARI North Ecliptic Pole field. Filling the gap between the optical data from other follow-up observations and mid-infrared (MIR) data from AKARI, our near-infrared (NIR) data provides contiguous wavelength coverage from optical to MIR. For the J- and H-band imaging, we used the FLoridA Mul…
Toward a Better Understanding of the Distance Scale from RR Lyrae Variable Stars: A Case Study for the Inner Halo Globular Cluster NGC 6723
López-Morales, Mercedes; Lee, Jae-Woo; Kang, Young-Woon +3 more
We present BV photometry for 54 variables in the metal-rich inner halo globular cluster NGC 6723. With the discovery of new RR Lyrae variables (RRLs), we obtain langP abrang = 0.541 ± 0.066 and langP crang = 0.292 ± 0.030 day, n(c)/n(ab+c) = 0.167, and langV(RR)rangint = 15.459 ± 0.055. We carry out the Fourier dec…
On the Progenitors of Local Group Novae. I. The M31 Catalog
Shafter, A. W.; Bode, M. F.; Darnley, M. J. +2 more
We report the results of a survey of M31 novae in quiescence. This is the first catalog of extragalactic systems in quiescence to be published, and contains data for 38 spectroscopically confirmed novae from 2006 to 2012. We used Liverpool Telescope images of each nova during eruption to define an accurate position for each system. These positions…
Solar Photoionization Rates for Interstellar Neutrals in the Inner Heliosphere: H, He, O, and Ne
Bochsler, P.; Kucharek, H.; Möbius, E. +4 more
Extreme UV (EUV) spectra from the Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED)/Solar EUV Experiment are used to infer photoionization rates in the inner heliosphere. Relating these rates to various proxies describing the solar EUV radiation, we construct a multi-linear model which allows us to extrapolate ionization rates bac…
A Chandra-Swift View of Point Sources in Hickson Compact Groups: High AGN Fraction but a Dearth of Strong AGNs
Hornschemeier, A. E.; Brandt, W. N.; Gallagher, S. C. +6 more
We present Chandra X-ray point source catalogs for 9 Hickson Compact Groups (HCGs, 37 galaxies) at distances of 34-89 Mpc. We perform detailed X-ray point source detection and photometry and interpret the point source population by means of simulated hardness ratios. We thus estimate X-ray luminosities (LX ) for all sources, most of whi…
Analytical Solution for Waves in Planets with Atmospheric Superrotation. II. Lamb, Surface, and Centrifugal Waves
López-Valverde, M. A.; Imamura, T.; Peralta, J. +3 more
This paper is the second in a two-part study devoted to developing tools for a systematic classification of the wide variety of atmospheric waves expected on slowly rotating planets with atmospheric superrotation. Starting with the primitive equations for a cyclostrophic regime, we have deduced the analytical solution for the possible waves, simul…
A Multi-level Solver for Gaussian Constrained Cosmic Microwave Background Realizations
Eriksen, H. K.; Seljebotn, D. S.; Mardal, K. -A. +2 more
We present a multi-level solver for drawing constrained Gaussian realizations or finding the maximum likelihood estimate of the cosmic microwave background sky, given noisy sky maps with partial sky coverage. The method converges substantially faster than existing Conjugate Gradient (CG) methods for the same problem. For instance, for the 143 GHz …