Search Publications
High-mass Star Formation Toward Southern Infrared Bubble S10
Tej, Anandmayee; Ishwara Chandra, C. H.; Vig, Sarita +2 more
An investigation in radio and infrared wavelengths of two high-mass star-forming regions toward the southern Galactic bubble S10 is presented here. The two regions under study are associated with the broken bubble S10 and Extended Green Object, G345.99-0.02, respectively. Radio continuum emission mapped at 610 and 1280 MHz using the Giant Metrewav…
Discovery of an X-Ray-emitting Contact Binary System 2MASS J11201034-2201340
Chen, W. P.; Kong, Albert K. H.; Ip, Wing-Huen +10 more
We report the detection of orbital modulation, a model solution, and the X-ray properties of a newly discovered contact binary, Two Micron All Sky Survey (2MASS) J11201034-2201340. We serendipitously found this X-ray point source outside the error ellipse when searching for possible X-ray counterparts of γ-ray millisecond pulsars among the unident…
How Accurate Are Infrared Luminosities from Monochromatic Photometric Extrapolation?
Fang, Guanwen; Lin, Zesen; Kong, Xu
Template-based extrapolations from only one photometric band can be a cost-effective method to estimate the total infrared (IR) luminosities ({L}{IR}) of galaxies. By utilizing multi-wavelength data that covers across 0.35-500 µm in GOODS-North and GOODS-South fields, we investigate the accuracy of this monochromatic extrapolated …
The Gray Extinction of the Ionizing Cluster in NGC 3603 from Ultraviolet to Optical Wavelengths
Grebel, Eva K.; Pang, Xiaoying; Pasquali, Anna
We use photometry in the F220W, F250W, F330W, F435W filters from the High Resolution Channel of the Advanced Camera for Surveys and photometry in the F555W, F675W, and F814W filters from the Wide Field and Planetary Camera 2 aboard the Hubble Space Telescope to derive individual stellar reddenings and extinctions for stars in the HD 97950 cluster …
Utilizing Synthetic UV Spectra to Explore the Physical Basis for the Classification of Lambda Boötis Stars
Cheng, Kwang-Ping; Tarbell, Erik S.; Neff, James E. +6 more
Lambda Boo-type stars are a group of late B to early F-type Population I dwarfs that show mild to extreme deficiencies of iron-peak elements (up to 2 dex), but their C, N, O, and S abundances are near solar. This intriguing stellar class has recently regained the spotlight because of the directly imaged planets around a confirmed Lambda Boo star, …
X-Raying the Dark Side of Venus—Scatter from Venus’ Magnetotail?
Weber, M.; Peres, G.; Reale, F. +3 more
We analyze significant X-ray, EUV, and UV emission coming from the dark side of Venus observed with Hinode/XRT and Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA) during a transit across the solar disk that occurred in 2012. As a check we have analyzed an analogous Mercury transit that occurred in 2006. We have used the latest ve…
Measuring Structural Parameters Through Stacking Galaxy Images
Li, Yubin; Zheng, Xian Zhong; Gu, Qiu-Sheng +4 more
It remains challenging to detect the low surface brightness structures of faint high-z galaxies, which are key to understanding the structural evolution of galaxies. The technique of image stacking allows us to measure the averaged light profile beneath the detection limit and probe the extended structure of a group of galaxies. We carry out simul…
A Search for Coronal Activity Among Two Metal-poor Subdwarfs and One Subgiant
Dupree, Andrea K.; Smith, Graeme H.; Günther, Hans Moritz
A search has been made using the XMM-Newton satellite for coronal soft X-ray emission from HD 19445, HD 25329, and HD 140283, three Population II stars in the Galactic halo having metallicities of {{[Fe/H]}}∼ -2. The program stars, consisting of two subdwarfs and one metal-poor subgiant, were pre-selected from ground-based observations to have He …
Ultraviolet Spectroscopy of BL Hyi and EF Eri in High and Intermediate States
Sanad, M. R.; Abdel-Sabour, M. A.
We present the first phase-resolved ultraviolet spectroscopy of two polar systems, BL Hyi and EF Eri, in high and intermediate states from the International Ultraviolet Explorer (IUE) during the periods between 1982-1995 and 1979-1991, respectively. The flux curves for the C IV and He II emission lines for both systems showing variations in their …
II Zwicky 23 and Family: A Group in Interaction
Rudie, Gwen C.; Gallagher, John S., III; Cigan, Phillip J. +1 more
II Zw 23 (UGC 3179) is a luminous (M B ∼ -21) nearby compact narrow emission line starburst galaxy with blue optical colors and strong emission lines. We present a photometric and morphological study of II Zw 23 and its interacting companion, KPG103a, using data obtained with the WIYN 3.5 m telescope in combination with a WFPC2 image …