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Astrometry with Hubble Space Telescope Fine Guidance Sensors—A Review
Nelan, Edmund P.; Harrison, Thomas E.; Benedict, G. Fritz +1 more
Over the last 20 years, Hubble Space Telescope Fine Guidance Sensor interferometric astrometry has produced precise and accurate parallaxes of astrophysical interesting stars and mass estimates for stellar companions. We review parallax results, and binary star and exoplanet mass determinations, and compare a subset of these parallaxes with prelim…
A New Method for Wide-field Near-IR Imaging with the Hubble Space Telescope
van Dokkum, Pieter G.; Franx, Marijn; Muzzin, Adam +6 more
We present a new technique for wide and shallow observations using the near-infrared channel of Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST). Wide-field near-IR surveys with HST are generally inefficient, as guide star acquisitions make it impractical to observe more than one pointing per orbit. This limitation can be circumvente…
The SCUBA-2 850 µm Follow-up of WISE-selected, Luminous Dust-obscured Quasars
Knudsen, Kirsten K.; Fan, Lulu; Han, Yunkun +1 more
Hot dust-obscured galaxies (Hot DOGs) are a new population recently discovered in the Wide-field Infrared Survey Explorer All-Sky survey. Multiwavelength follow-up observations suggest that they are luminous, dust-obscured quasars at high redshift. Here we present the JCMT SCUBA-2 850 µm follow-up observations of 10 Hot DOGs. Four out of ten…
Visualization of Multi-mission Astronomical Data with ESASky
de Marchi, Guido; Merín, Bruno; O'Mullane, William +17 more
ESASky is a science-driven discovery portal to explore the multi-wavelength sky and visualize and access multiple astronomical archive holdings. The tool is a web application that requires no prior knowledge of any of the missions involved and gives users world-wide simplified access to the highest-level science data products from multiple astrono…
Abundance Analyses of the New R Coronae Borealis Stars: ASAS-RCB-8 and ASAS-RCB-10
Kamath, Devika; Pandey, Gajendra; Kameswara Rao, N. +3 more
Abundance analyses of the two newly discovered R Coronae Borealis (RCB) stars ASAS-RCB-8 and ASAS-RCB-10 were conducted using high-resolution optical spectra and model atmospheres. Their chemical compositions place the pair among the majority class of RCBs. ASAS-RCB-10 is one of the most N-poor majority RCBs with an above average O abundance. Rela…
Performance of an Algorithm for Estimation of Flux, Background, and Location on One-dimensional Signals
Busonero, D.; Cancelliere, R.; Gai, M.
Optimal estimation of signal amplitude, background level, and photocenter location is crucial to the combined extraction of astrometric and photometric information from focal plane images, in particular from the one-dimensional measurements performed by Gaia on intermediate to faint magnitude stars. Our goal is to define a convenient maximum likel…
The Short-term Stability of a Simulated Differential Astrometric Reference Frame in the Gaia Era
Sozzetti, Alessandro; Abbas, Ummi; Bucciarelli, Beatrice +5 more
We use methods of differential astrometry to construct a small field inertial reference frame stable at the micro-arcsecond level. Such a high level of astrometric precision can be expected with the end-of-mission standard errors to be achieved with the Gaia space satellite using global astrometry. We harness Gaia measurements of field angles and …
Mass Outflow from Cool Giants in Symbiotic Stars
Shagatova, Natalia
Fundamental Parameters of the Eclipsing Binary TU Canis Majoris
Mennickent, R. E.; Garcés L., J.; Zharikov, S.
We present a spectroscopic and photometric study of the eclipsing binary TU Canis Majoris aimed to obtain their fundamental stellar parameters and evolutionary stage. Our results indicate that the masses, radii, temperatures, and luminosities for the primary and secondary stars are: {M}1=1.761+/- 0.012 {M}⊙ , {M}2=…
Photometric Strömgren-Hβ Quantification for O and B Stars of Luminosity Class V
Paunzen, Ernst; Kaltcheva, Nadia; Golev, Valeri
In any photometric system, the relationship between the spectral type and the intrinsic colors is fundamental for the photometric stellar classification and for a reliable derivation of stellar parameters. Such relationships are being constantly verified and improved based on larger and better samples. The capability of the Strömgren-Hβ photometry…