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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…

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 …