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KEPLER INPUT CATALOG: PHOTOMETRIC CALIBRATION AND STELLAR CLASSIFICATION
- T. Brown, D. Latham, M. Everett, Gilbert A. Esquerdo Las Cumbres Observatory Global Telescope, Harvard-Smithsonian Center for Astrophysics, N. A. Observatories
- Physics
- 2 February 2011
We describe the photometric calibration and stellar classification methods used by the Stellar Classification Project to produce the Kepler Input Catalog (KIC). The KIC is a catalog containing… Expand
Helium Abundance in the Most Metal-deficient Blue Compact Galaxies: I Zw 18 and SBS 0335–052
- Y. Izotov, F. Chaffee, +13 authors Charlottesville
- Physics
- 16 July 1999
We present high-quality spectroscopic observations of the two most metal-deficient blue compact galaxies known, I Zw 18 and SBS 0335-052. We use the data to determine the heavy-element and helium… Expand
The Frequency of Barred Spiral Galaxies in the Near-Infrared*
- P. Eskridge, J. Frogel, +14 authors N. A. Observatories
- Physics
- 26 October 1999
We have determined the fraction of barred galaxies in the H-band for a statistically well-defined sample of 186 spirals drawn from the Ohio State University Bright Spiral Galaxy Survey. We find 56%… Expand
Ages and Metallicities of Star Clusters and Surrounding Fields in the Outer Disk of the Large Magellanic Cloud
- E. Bica, D. Geisler, +13 authors MG BeloHorizonte
- Physics
- 14 March 1998
We present Washington system CT1 color-magnitude diagrams of 13 star clusters and their surrounding fields that lie in the outer parts of the LMC disk (r > 4°), as well as a comparison inner cluster.… Expand
A search for old star clusters in the large magellanic cloud
- D. Geisler, E. Bica, +13 authors MG BeloHorizonte
- Physics
- 18 September 1997
We report the first results of a color-magnitude diagram survey of 25 candidate old LMC clusters. For almost all of the sample, it was possible to reach the turnoff region, and in many clusters we… Expand
Cepheid Calibration of the Peak Brightness of SNe Ia.
- A. Saha, A. Sandage, +8 authors Space Sciences Department of Esa
- Physics
- 28 April 1999
Repeated imaging observations have been made of NGC 3627 with the Hubble Space Telescope in 1997/98, over an interval of 58 days. Images were obtained on 12 epochs in the F555W band and on five… Expand
Kepler-4b: A Hot Neptune-Like Planet of a G0 Star Near Main-Sequence Turnoff
- W. J. Borucki, Davig G. Koch, +27 authors S. Institute
- Physics
- 4 January 2010
Early time-series photometry from NASA's Kepler spacecraft has revealed a planet transiting the star we term Kepler-4, at R.A. = 19h02m2768, ? = +50?08'087. The planet has an orbital period of 3.213… Expand
The 4He Abundance in the Metal-deficient Blue Compact Dwarf Galaxies Tol 1214–277 and Tol 65*
- Y. Izotov, F. Chaffee, +5 authors N. A. Observatories
- Physics
- 17 September 2001
We present high-quality Keck telescope spectroscopic observations of the two metal-deficient blue compact dwarf (BCD) galaxies Tol 1214-277 and Tol 65. These data are used to derive the heavy-element… Expand
A Spectroscopic Study of Component C and the Extended Emission around I Zw 18
- Y. Izotov, F. Chaffee, +16 authors Germany.
- Physics
- 17 September 2001
Long-slit Keck II, 4 m Kitt Peak, and 4.5 m MMT spectrophotometric data are used to investigate the stellar population and the evolutionary status of I Zw 18C, the faint C component of the nearby… Expand
Astrophysical tests of gravity: a screening map of the nearby universe
Astrophysical tests of modified gravity theories in the nearby universe have been emphasized recently by Hui 2009 and Jain 2011. A key element of such tests is the screening mechanism whereby general… Expand