Results 81 to 90 of about 84,707 (221)

Hubble Space Telescope Observations of M32: The Color-Magnitude Diagram [PDF]

, 1996
We present a V-I color-magnitude diagram for a region 1'-2' from the center of M32 based on Hubble Space Telescope WFPC2 images. The broad color-luminosity distribution of red giants shows that the stellar population comprises stars with a wide range in ...
Ajhar, Edward A., Baum, William A., Faber, S. M., Freedman, Wendy L., Grillmair, Carl J., Holtzman, Jon A., Lauer, Tod R., Lynds, C. Roger, Madore, Barry F., O'Neil, Jr., Earl J., Stetson, Peter B., Worthey, Guy   +11 more
core   +3 more sources

The Importance of Optical Wavelength Data on Atmospheric Retrievals of Exoplanet Transmission Spectra

The Astronomical Journal
Exoplanet transmission spectra provide rich information about the chemical composition, clouds, and temperature structure of exoplanet atmospheres. Most exoplanet transmission spectra only span infrared wavelengths (≳1 μ m), which can preclude crucial ...
Charlotte Fairman, Hannah R. Wakeford, Ryan J. MacDonald   +2 more
doaj   +1 more source

HSTDEK: Developing a methodology for construction of large-scale, multi-use knowledge bases [PDF]

The primary research objectives of the Hubble Space Telescope Design/Engineering Knowledgebase (HSTDEK) are to develop a methodology for constructing and maintaining large scale knowledge bases which can be used to support multiple applications.
Freeman, Michael S.
core   +1 more source

Hubble Space Telescope Photometry of Globular Clusters in M81

, 2011
We perform aperture photometry and profile fitting on 419 globular cluster (GC) candidates with mV \leq 23 mag identified in Hubble Space Telescope Advanced Camera for Surveys BVI imaging, and estimate the effective radii of the clusters.
Andreas Zezas, Barmby, Barmby, Barmby, Bertin, Chandar, Chandar, Chandar, Côté, de Vaucouleurs, Ferrarese, Freedman, Gómez, Harris, Harris, Jay Strader, John P. Huchra, Jordán, Julie B. Nantais, Kosmas Gazeas, Kundu, Kundu, Larsen, Larsen, Larsen, Lee, Lupton, Madrid, Masters, Nantais, Nantais, Rhode, Schlegel, Schröder, Spitler, Strader   +35 more
core   +1 more source

Hubble Space Telescope: Optical telescope assembly handbook. Version 1.0 [PDF]

The Hubble Space Telescope is described along with how its design affects the images produced at the Science Instruments. An overview is presented of the hardware.
Burrows, Chris
core   +1 more source

Appendange deployment mechanism for the Hubble Space Telescope program [PDF]

, 1985
The key requirements, a design overview, development testing (qualification levels), and two problems and their solutions resolved during the mechanism development testing phase are presented.
Greenfield, H. T.
core   +1 more source

New Estimates of Nitrogen Fixation on Early Earth

Life
Fixed nitrogen species generated by the early Earth’s atmosphere are thought to be critical to the emergence of life and the sustenance of early metabolisms.
Madeline Christensen, Danica Adams, Michael L. Wong, Patrick Dunn, Yuk L. Yung   +4 more
doaj   +1 more source

Status Report on the Chicago-Carnegie Hubble Program (CCHP): Measurement of the Hubble Constant Using the Hubble and James Webb Space Telescopes

The Astrophysical Journal
We present the latest results from the Chicago-Carnegie Hubble Program to measure the Hubble constant, using data from the James Webb Space Telescope (JWST). The overall program aims to calibrate three independent methods: (1) tip of the red giant branch
Wendy L. Freedman, Barry F. Madore, Taylor J. Hoyt, In Sung Jang, Abigail J. Lee, Kayla A. Owens   +5 more
doaj   +1 more source

M104: The Sombrero Galaxy Lithograph [PDF]

, 2004
This lithograph is part of a series designed to bring the latest Hubble Space Telescope images into the classroom. Students make comparisons, conduct research, organize their materials, and present a report describing how a galaxy's orientation affects ...

core  

Protostars, Dust Globules, and a Herbig-Haro Object in the LMC Superbubble N51D

, 2005
Using Spitzer Space Telescope and Hubble Space Telescope observations of the superbubble N51D, we have identified three young stellar objects (YSOs) in dust globules, and made the first detection of a Herbig-Haro object outside the Galaxy.
Chen, C. -H. R., Chu, Y. -H., Clayton, G. C., Dickel, J. R., Dunne, B. C., Gordon, K. D., Gruendl, R. A., Looney, L. W., Points, S. D., Smith, R. C., Whitney, B. A., Williams, R. M.   +11 more
core   +1 more source