Flash Mixing on the White Dwarf Cooling Curve: Understanding Hot Horizontal Branch Anomalies in NGC 2808
- T. Brown, A. Sweigart, T. Lanz, W. Landsman, I. Hubeny
- Physics
- 2 August 2001
We present an ultraviolet color-magnitude diagram (CMD) spanning the hot horizontal branch (HB), blue straggler, and white dwarf populations of the globular cluster NGC 2808. These data were obtained…
Hot Horizontal-Branch Stars: The Ubiquitous Nature of the “Jump” in Strömgren u, Low Gravities, and the Role of Radiative Levitation of Metals
- F. Grundahl, M. Catelán, W. Landsman, P. Stetson, M. Andersen
- Physics
- 9 March 1999
A "jump" in the blue horizontal-branch (HB) distribution in the (V, u-y) color-magnitude diagram has recently been detected in the globular cluster (GC) M13 (NGC 6205) by Grundahl and coworkers. Such…
VERY EARLY ULTRAVIOLET AND OPTICAL OBSERVATIONS OF THE TYPE Ia SUPERNOVA 2009ig
- R. Foley, P. Challis, J. Woo
- Physics
- 5 September 2011
Supernova (SN) 2009ig was discovered 17 hr after explosion by the Lick Observatory Supernova Search, promptly classified as a normal Type Ia SN (SN Ia), peaked at V = 13.5 mag, and was equatorial,…
Goddard high-resolution spectrograph observations of the local interstellar medium and the deuterium/hydrogen ratio along the line of sight toward Capella
- J. Linsky, Alexander Brown, S. Heap
- Physics
- 10 January 1993
HST Goddard High-Resolution Spectrograph observations of the 1216, 2600, and 2800 A spectral regions are analyzed for the spectroscopic binary system Capella, obtained at orbital phase 0.26 with…
Lyman-Alpha Absorption and the D/H Ratio in the Local Interstellar Medium
- Andrew R. Dring, J. Linsky, W. Landsman
- Physics, Geology
- 20 October 1997
Using the Goddard High Resolution Spectrograph onboard the Hubble Space Telescope, we have observed Lyα absorption against stellar chromospheres along six lines of sight, with additional observations…
The On-Orbit Performance of the Space Telescope Imaging Spectrograph
- R. Kimble, B. Woodgate, T. Wolfe
- Physics, GeologyAstronomical Telescopes and Instrumentation
- 10 January 1998
The Space Telescope Imaging Spectrograph (STIS) was successfully installed into the Hubble Space Telescope (HST) in 1997 February, during the second HST servicing mission, STS-82. STIS is a versatile…
Further calibration of the Swift ultraviolet/optical telescope
- A. Breeveld, P. Curran, D. Berk
- Physics
- 14 April 2010
The Ultraviolet/Optical Telescope (UVOT) is one of three instruments onboard the Swift observatory. The photometric calibration has been published, and this paper follows up with details on other…
On the Age Estimation of LBDS 53W091
- S. Yi, T. Brown, A. Sweigart
- Physics
- 4 November 1999
The recent spectral analysis of LBDS 53W091 by Spinrad and his collaborators has suggested that this red galaxy is at least 3.5 Gyr old, but this analysis suggests an age of approximately 1.4-1.8 Gyr, which cannot be easily reconciled with that of Spinrad et al.
Swift and Chandra Detections of Supernova 2006jc: Evidence for Interaction of the Supernova Shock with a Circumstellar Shell
- S. Immler, M. Modjaz, J. Greiner
- Physics
- 19 December 2007
The peculiar Type Ib supernova (SN) 2006jc has been observed with the UV/Optical Telescope (UVOT) and X-Ray Telescope (XRT) on board the Swift observatory over a period of 19-183 days after the…
Hot Populations in M87 Globular Clusters
- S. Sohn, R. O’Connell, J. Rose
- Physics
- 13 October 2005
To explore the production of UV-bright stars in old, metal-rich populations like those in elliptical galaxies, we have obtained Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph far-…
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