12 papers · 1 filter
A Survey of Local Group Galaxies Currently Forming Stars: III. A Search for Luminous Blue Variables and Other H-alpha Emission-Lined Stars
Philip Massey, Reagin T. McNill, K. A. G. Olsen +5
We describe a search for H-alpha emission-lined stars in M31, M33, and seven dwarfs in or near the Local Group (IC 10, NGC 6822, WLM, Sextans B, Sextans A, Pegasus and the Phoenix…
Ionized and neutral gas in the peculiar star/cluster complex in NGC 6946
Yu. N. Efremov, V. L. Afanasiev, E. J. Alfaro +8
The characteristics of ionized and HI gas in the peculiar star/cluster complex in NGC 6946, obtained with the 6-m telescope (BTA) SAO RAS, the Gemini North telescope, and the Weste…
Nuclear Star Clusters in Edge-on Galaxies
Anil C. Seth, Julianne J. Dalcanton, Paul W. Hodge +1
From observations of edge-on, late-type galaxies, we present morphological evidence that some nuclear star clusters have experienced in situ star formation. We find three nuclear c…
A Survey of Local Group Galaxies Currently Forming Stars. I. UBVRI Photometry of Stars in M31 and M33
Philip Massey, K. A. G. Olsen, Paul W. Hodge +4
We present UBVRI photometry obtained from Mosaic images of M31 and M33 using the KPNO 4-m telescope. The survey covers 2.2 sq degrees of M31, and 0.8 sq degrees of M33, chosen so a…
Supersoft X-ray Sources in M31: I. A Chandra Survey and an Extension to Quasisoft Sources
R. Di Stefano, A. K. H. Kong, J. Greiner +9
We report on very soft X-ray sources (VSSs) in M31. In a survey which was most sensitive to soft sources in four 8'x8' regions covered by Chandra's ACIS-S S3 CCD, we find 33 VSSs t…
The Outer Edges of Dwarf Irregular Galaxies: Stars and Gas
P. W. Hodge, D. A. Hunter, M. S. Oey
We have in recent years come to view dwarf galaxy evolution in the broader context of the cosmic evolution of large-scale structure. Dwarf galaxies, as the putative building blocks…