Search Publications
Measuring Young Stars in Space and Time. I. The Photometric Catalog and Extinction Properties of N44
Gennaro, Mario; Dolphin, Andrew E.; Klessen, Ralf S. +9 more
In order to better understand the role of high-mass stellar feedback in regulating star formation in giant molecular clouds, we carried out a Hubble Space Telescope (HST) Treasury Program Measuring Young Stars in Space and Time (MYSST) targeting the star-forming complex N44 in the Large Magellanic Cloud (LMC). Using the F555W and F814W broadband f…
Three New Late-type Stellar Companions to Very Dusty WISE Debris Disks Identified with SPHERE Imaging
Mamajek, Eric; Hinkley, Sasha; Crossfield, Ian J. M. +8 more
Debris disk stars are good targets for high-contrast imaging searches for planetary systems, since debris disks have been shown to have a tentative correlation with giant planets. We selected 20 stars identified as debris disk hosts by the WISE mission, with particularly high levels of warm dust. We observed these with the VLT/SPHERE high-contrast…
Dissecting the Quadruple Binary Hyad vA 351 Masses for Three M Dwarfs and a White Dwarf
Torres, Guillermo; Latham, David W.; Skiff, Brian A. +8 more
We extend results first announced by Franz et al., that identified vA 351 = H346 in the Hyades as a multiple star system containing a white dwarf. With Hubble Space Telescope Fine Guidance Sensor fringe tracking and scanning, and more recent speckle observations, all spanning 20.7 years, we establish a parallax, relative orbit, and mass fraction f…
The Initial Mass Function of Low-mass Stars and Brown Dwarfs in the W3 Complex
Luhman, K. L.; Huston, M. J.
We have used archival infrared images obtained with the Wide Field Camera 3 on board the Hubble Space Telescope to constrain the initial mass function of low-mass stars and brown dwarfs in the W3 star-forming region. The images cover 438 arcmin2, which encompasses the entire complex, and were taken in the filters F110W, F139M, and F160W…
Astrometric Observations of a Near-Earth Object Using the Image Fusion Technique
Su, Jie; Wang, Jiancheng; Zhang, Yigong +2 more
The precise astrometric observation of small near-Earth objects (NEOs) is an important observational research topic in the astrometric discipline, which greatly promotes multidisciplinary research, such as the origin and evolution of the solar system, the detection and early warning of small NEOs, and deep-space navigation. The characteristics of …
Spectroscopic and Photometric Monitoring of a Poorly Known Highly Luminous OH/IR Star: IRAS 18278+0931
Dutta, Somnath; Mondal, Soumen; Das, Ramkrishna +1 more
We present the time-dependent properties of a poorly known OH/IR star, IRAS 18278+0931 (hereafter IRAS 18+09), toward the Ophiuchus constellation. We have carried out long-term optical/near-infrared photometric and spectroscopic observations to study the object. From optical R- and I-band light curves, the period of IRAS 18+09 is estimated to be 5…
Interstellar Extinction in the Direction of the Open Cluster King 7 and New Parameters of the Cluster
Straižys, V.; Raudeliūnas, S.; Maskoliūnas, M. +8 more
Interstellar extinction in two concentric square areas of the sizes 1.25 × 1.25 deg2 and 0.2 × 0.2 deg2 in the direction of open cluster King 7 is investigated applying two-dimensional photometric classification of stars observed in the Vilnius seven-color photometric system down to V = 15.5 mag (1084 stars) and 19.5 mag (584…
Herbig Ae/Be Stars toward the Dark Cloud LDN 1667
Pereira, C. B.; Marcolino, W. L. F.; Miranda, L. F.
We report the discovery of a new emission-line object, named SPH 4-South = (GAIA EDR3 5616553300192230272), toward the dark cloud LDN 1667. This object came to our attention after inspecting public images that show a faint diffuse nebula a few arcseconds south of SPH 4, an emission-line object previously classified as a T Tauri star. We present hi…
Identifying Periodic Variable Stars and Eclipsing Binary Systems with Long-term Las Cumbres Observatory Photometric Monitoring of ZTF J0139+5245
Vanderbosch, Zachary P.; Montgomery, Michael H.; Sanghi, Aniket
We present the results of our search for variable stars using the long-term Las Cumbres Observatory (LCO) monitoring of white dwarf ZTF J0139+5245 with the two 1.0 m telescope nodes located at McDonald Observatory using the Sinistro imaging instrument. In this search, we find 38 variable sources, of which 27 are newly discovered or newly classifie…
Fundamental Parameters of the Eclipsing Binary DD CMa and Evidence for Mass Exchange
González, J. F.; Mennickent, R. E.; Cabezas, M. +5 more
We present a detailed photometric and spectroscopic analysis of DD CMa, based on published survey photometry and new spectroscopic data. We find an improved orbital period of Po = 2.0084530(6) days. Our spectra reveal Hβ and Hα absorptions with weak emission shoulders, and we also find a color excess in the Wide-field Infrared Survey Ex…