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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…