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49 papers · 1 filter
CCD uvbyHbeta Photometry in Clusters: I. The Open Cluster Standard, IC 4651
B. J. Anthony-Twarog, B. A. Twarog
CCD photometry of the intermediate-age open cluster, IC 4651, on the uvbyHbeta system is presented and analyzed. By using a combination of the information from the color-magnitude…
The Reappearance of the Transient Low Mass X-ray Binary X1658-298
Stefanie Wachter, Alan P. Smale, Charles Bailyn
In April 1999 the transient low mass X-ray binary X1658-298 resumed its strong and persistent X-ray emission after a 21-year interval of quiescence. We present RXTE data obtained s…
Calibration of Nebular Emission-Line Diagnostics: I. Stellar Effective Temperatures
M. S. Oey, M. A. Dopita, J. C. Shields +1
We present a detailed comparison of optical H II region spectra to photoionization models based on modern stellar atmosphere models. We examine both spatially resolved and integrat…
Age and Metallicity Effects in Omega Centauri
Joanne Hughes, George Wallerstein
We have observed (with vby filters) a field north of the core of the most massive globular cluster in our galaxy, Omega Centauri. We have found a correlation of age and metallicity…
RR Lyrae Stars in NGC 6388 and NGC 6441: A New Oosterhoff Group?
Barton Pritzl, Horace A. Smith, Marcio Catelan +1
NGC 6388 and NGC 6441 are anomalies among Galactic globular clusters in that they cannot be readily place into either Oosterhoff group I or Oosterhoff group II despite their signif…
Multiple Stellar Populations in the Globular Cluster omega Centauri as Tracers of a Merger Event
Young-Wook Lee, Jong-Myung Joo, Young-Jong Sohn +3
The discovery of the Sagittarius dwarf galaxy, which is being tidally disrupted by and merging with the Milky Way, supports the view that the halo of the Galaxy has been built up a…