Search Publications
Using the Modified Lognormal Power-law Distribution to Model the Mass Function of NGC 1711
Basu, Shantanu; Madaan, Deepakshi; Lianou, Sophia
A determination of the mass function (MF) of stellar clusters can be quite dependent on the range of measured masses, the fitting technique, and the analytic function that is being fit to the data. Here, we use Hubble Space Telescope/WFPC2 data of NGC 1711, a stellar cluster in the Large Magellanic Cloud, as a test case to explore a range of possi…
A search for supernova light echoes in NGC 6946 with SITELLE
Welch, D. L.; Radica, M. C.; Rousseau-Nepton, L.
We present the analysis of 4 h of spectroscopic observations of NGC 6946 with the SITELLE Imaging Fourier Transform Spectrometer on the Canada-France-Hawaii Telescope, acquired to search for supernova light echoes from its 10 modern supernovae. We develop a novel spectroscopic search method: identifying negatively sloped continua in the narrow-ban…
A Photometric Study of the Contact Binary GR Piscium
Michaels, E. J.
High-quality CCD photometric light curves of the eclipsing binary GR Psc are presented. The new multicolor light curves display total eclipses which were analyzed using the Wilson-Devinney program. The light curve solution describes the system as a contact configuration with a mass ratio of M2 / M1 = 0.431, a fill-out of f = 47%, and a small tempe…
Pixel-based Spectral Characterization of Mid-infrared Si Array Detectors for Astronomical Observations in Space
Kaneda, Hidehiro; Ishihara, Daisuke; Wada, Takehiko +2 more
Mid-infrared (IR) array detectors have been used for astronomical observations in space. However, the uniformities of their spectral response curves have not been investigated in detail, the understanding of which is important for spectroscopic observations using large array formats. We characterize the spectral responses of all the pixels in IR a…
Multiwavelength Analysis of the Kinematics of a Long Duration Flare-CME Event on 27 January 2012
Shanmugaraju, A.; Suresh, K.; Selvarani, G. +1 more
We present a detailed analysis of a long-duration flare associated with a coronal mass ejection (CME) event that occurred on 27 January 2012 in the active region (AR) 11402. We analyze the kinematics of the CME and the close relationship between the flare, radio burst, and CME. We used STEREO (Solar Terrestrial Relations Observatory)/EUVI A (Extre…
Multi-wavelength study in the region of IRAS 16571-4029 and 16575-4023 sources
Baume, G.; Borissova, J.; Ramirez Alegria, S. +2 more
We studied the stellar populations and their associated interstellar medium structures located in the region of IRAS 16571-4029 and 16575-4023 sources, aiming to evaluate their distance and their main physical parameters. We focused our attention on the embedded cluster DBS 113 and its associated HII region RCW 116B.
For the study, optical im…A photochemical model of ultraviolet atomic line emissions in the inner coma of comet 67P/Churyumov-Gerasimenko
Bhardwaj, Anil; Raghuram, Susarla
Alice ultraviolet spectrometer onboard Rosetta space mission observed several spectroscopic emissions emanated from volatile species of comet 67P/Churyumov-Gerasimenko (hearafter 67P/C-G) during its entire escorting phase. The measured emission intensities, when the comet was at around 3 AU pre-perihelion, have been used to derive electron densiti…
Absolute Magnitudes of Early-type Supergiants from uvbyβ Photometry and Parallax Data
Paunzen, Ernst; Prišegen, Michal; Kaltcheva, Nadia +2 more
We combine Strömgren-Crawford uvbyβ photometry with Gaia-DR2 parallaxes for a sample of 880 supergiants of O-B9 spectral types to explore the potential of these data in providing physical parameters of such stars. We obtained reddening corrections and photometric absolute magnitudes via the existing uvbyβ calibrations. We calculated Gaia-based abs…
An investigation of low-mass-ratio EW systems from the Catalina Sky Survey
Papageorgiou, A.; Catelan, M.; Christopoulou, P. E. +1 more
We have conducted a survey of overcontact binary systems (EW) with mass ratio ≤ 0.25 from the Catalina Sky Survey (CSS) that are considered strong merger candidates and are probable progenitors of FK Com-type stars and blue stragglers. The discovery of such extreme mass ratio overcontact binaries is vital to resolve the critical mass ratio ambigui…
The Molecular Outflow from R Mon
Güsten, R.; Sandell, Göran; Vacca, W. +1 more
We have mapped the young Herbig Be star R Mon in CO(3-2) and 13CO(3-2) with Atacama Pathfinder EXperiment in Chile and analyzed unpublished Herschel images. We find that R Mon is embedded in a small cloud with a gas temperature of ∼20 K and a total mass of ∼70 ${M}_{\odot }$ . We confirm that R Mon drives a bipolar molecular outflow, wh…