Zobrazeno 1 - 10
of 128
pro vyhledávání: '"Hesser, James"'
Autor:
Pevtsov, Alexei, Griffin, Elizabeth, Grindlay, Jonathan, Kafka, Stella, Bartlett, Jennifer Lynn, Usoskin, Ilya, Mursula, Kalevi, Gibson, Sarah, Pillet, Valentin M., Burkepile, Joan, Webb, David, Clette, Frederic, Hesser, James, Stetson, Peter, Munoz-Jaramillo, Andres, Hill, Frank, Bogart, Rick, Osborn, Wayne, Longcope, Dana
Publikováno v:
White Paper, ASTRO2020 Decadal Survey, 2020
Over the past decades and even centuries, the astronomical community has accumulated a signif-icant heritage of recorded observations of a great many astronomical objects. Those records con-tain irreplaceable information about long-term evolutionary
Externí odkaz:
http://arxiv.org/abs/1903.04839
Autor:
Hesser, James E., Fulbright, Jon P.
We review properties of the most metal-deficient globular clusters and halo stars in the local universe as of March 2001, with goals of examining present evidence for the duration of the initial burst of massive cluster formation in the Milky Way, de
Externí odkaz:
http://arxiv.org/abs/astro-ph/0110163
Autor:
Hanes, David A., Cote, Patrick, Bridges, Terry J., McLaughlin, Dean E., Geisler, Doug, Harris, Gretchen L. H., Hesser, James E., Lee, Myung Gyoon
We present a comprehensive database of kinematic, photometric and positional information for 352 objects in the field of M87 (NGC 4486), the central giant elliptical galaxy in the Virgo cluster; the majority of the objects are globular clusters assoc
Externí odkaz:
http://arxiv.org/abs/astro-ph/0106004
Autor:
Cote, Patrick, McLaughlin, Dean E., Hanes, David A., Bridges, Terry J., Geisler, Doug, Merritt, David, Hesser, James E., Harris, Gretchen L. H., Lee, Myung Gyoon
We present a dynamical analysis of the globular cluster system associated with M87 (= NGC 4486), the cD galaxy near the dynamical center of the Virgo cluster. The analysis utilizes a new spectroscopic and photometric database which is described in a
Externí odkaz:
http://arxiv.org/abs/astro-ph/0106005
We have used an Imaging Fabry-Perot Spectrophotometer with the Adaptive Optics Bonnette on the Canada-France-Hawaii Telescope to measure stellar radial velocities in the globular cluster M15. An average seeing of 0.15" full-width at half maximum, wit
Externí odkaz:
http://arxiv.org/abs/astro-ph/9912172
Autor:
Smecker-Hane, Tammy A., Mandushev, Georgi I., Hesser, James E., Stetson, Peter B., Da Costa, G. S., Hatzidimitriou, Despina
We report on the chemical abundances of stars in the Carina dwarf spheroidal galaxy (dSph) derived from low-resolution spectra. We have determined values of [Fe/H] for 52 stars from the reduced equivalent width of the Ca II infrared triplet lines. Th
Externí odkaz:
http://arxiv.org/abs/astro-ph/9910212
Publikováno v:
Astron.Astrophys.348:418,1999
We used the Wide Field Planetary Camera 2 aboard the Hubble Space Telescope to search for globular clusters in the inner regions of the nearby giant elliptical galaxy NGC 5128. This galaxy is believed to be the product of a merger between a large ell
Externí odkaz:
http://arxiv.org/abs/astro-ph/9906247
We present new VI photometry for the halo globular cluster M30 (NGC 7099), and compute luminosity functions (LFs) in both bands for samples of about 15,000 hydrogen-burning stars from near the tip of the red giant branch (RGB) to over four magnitudes
Externí odkaz:
http://arxiv.org/abs/astro-ph/9810259
Autor:
Stetson, Peter B., Bolte, Michael, Harris, William E., Hesser, James E., Bergh, Sidney van den, VandenBerg, Don A., Bell, Roger A., Johnson, Jennifer A., Bond, Howard E., Fullton, Laura K., Fahlman, Gregory G., Richer, Harvey B.
We have used the WFPC2 camera on the Hubble Space Telescope to obtain photometry of the outer-halo globular clusters Palomar 3, Palomar 4, and Eridanus. These three are classic examples of the "second parameter" anomaly because of their red horizonta
Externí odkaz:
http://arxiv.org/abs/astro-ph/9809176
A (V,V - I)--diagram for the intermediate-age open cluster NGC 7789 has been derived from CCD observations of more than 15,000 stars within ~ 18 arcmin of the cluster center. From the brightest giants and blue stragglers at V ~ 11 to the faintest low
Externí odkaz:
http://arxiv.org/abs/astro-ph/9808117