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An All-Sky Portable (ASP) Optical Catalogue
Flesch, Eric Wim
This optical catalogue combines the all-sky USNO-B1.0/A1.0 and most-sky APM catalogues, plus overlays of SDSS optical data, into a single all-sky map presented in a sparse binary format that is easily downloaded at 9 Gb zipped. Total count is 1 163 237 190 sources and each has J2000 astrometry, red and blue magnitudes with PSFs and variability ind…
The Million Optical - Radio/X-ray Associations (MORX) Catalogue
Flesch, Eric W.
This automated catalogue combines all the largest published optical, radio, and X-ray sky catalogues to find probable radio/X-ray associations to optical objects, plus double radio lobes, using uniform processing against all input data. The total count is 1 002 855 optical objects so presented. Each object is displayed with J2000 astrometry, optic…
Is the Stellar System WR 11 a Gamma-Ray Source?
Benaglia, Paula
Many early-type stars are in systems; some of them have been indicated as putative high-energy emitters. The radiation would be produced at the region where two stellar winds collide. Compelling evidence of such emission was found only for the colliding-wind binary (CWB) Eta Car, which was associated to a GeV source. Very recently, the closest CWB…
An Evaluation of the Membership Probability of 212 λ Boo Stars. I. A Catalogue
Murphy, Simon J.; Cheng, Kwang-Ping; Neff, James E. +6 more
The literature on the λ Boo stars has grown to become somewhat heterogenous, as different authors have applied different criteria across the UV, optical, and infrared regions to determine the membership status of λ Boo candidates. We aim to clear up the confusion by consulting the literature on 212 objects that have been considered as λ Boo candid…
Stellar Populations and the Star Formation Histories of LSB Galaxies: IV Spitzer Surface Photometry of LSB Galaxies
McGaugh, Stacy; Schombert, James M.
Surface photometry at 3.6 µm is presented for 61 low surface brightness (LSB) galaxies (µ o <19 3.6 µm mag arcsecs-2). The sample covers a range of luminosity from -11 to -22 in M 3.6 and size from 1 to 25 kpc. The morphologies in the mid-IR are comparable to those in the optical with 3.6 &micr…
Complex Analysis of the Stellar Binary HD25811: A Subgiant System
Al-Wardat, Mashhoor A.; Widyan, Hatem S.; Al-thyabat, Ahmed
The visually close binary system HD25811 is analysed to estimate its physical and geometrical parameters in addition to its spectral type and luminosity class. The method depends on obtaining the best fit between the entire observational spectral energy distribution (SED) of the system and synthetic SEDs created by atmospheric modelling of the ind…
Investigation of Cyg OB2 #11(O5 Ifc) by Modelling its Atmosphere
Maryeva, Olga; Zhuchkov, Roman; Malogolovets, Eugene
We continue the study of O-supergiants belonging to the association Cyg OB2 using moderate-resolution spectra. In this paper we present results of the modelling of the stellar atmosphere of Cyg OB2 #11. This object belongs to the spectral class Ofc, which was recently introduced and is yet small in numbers. Ofc class consists of stars with normal …
Multiwavelength Observations of AB Doradus
Johnston-Hollitt, M.; Budding, E.; Slee, O. B. +1 more
We have observed the bright, magnetically active multiple star AB Doradus in a multiwavelength campaign centring around two large facility allocations in November 2006 and January, 2007. Our observations have covered at least three large flares. These flares were observed to produce significant hardening of the X-ray spectra during their very init…
Verification of the Spectral Classification of Stars Using the Hipparcos Catalogue
Deb, D.; Chakraborty, P.
The spectral classifications of the stars from spectral data have been corrected from time to time and new spectral and luminosity classes have been assigned. Identifying stars with wrong spectral and luminosity classification has been a stupendous task from the huge catalogue of stars. In this work we describe a simple statistical technique to id…
A Coronal Jet Ejection from a Sunspot Light Bridge
Liu, S.
Chromospheric brightening and Hα surges are evident and common phenomena along sunspot light bridges. In this paper, a coronal jet ejection from a sunspot light bridge is presented. Using data from the Solar Dynamics Observatory and Hinode satellites, it is confirmed that the jet has its root near the light bridge. This suggests that the jet may b…