Zobrazeno 1 - 10
of 68
pro vyhledávání: '"Downes, Ronald A."'
Autor:
Whitmore, Bradley C., Allam, Sahar S., Budavari, Tamas, Casertano, Stefano, Downes, Ronald A., Donaldson, Thomas, Fall, S. Michael, Lubow, Stephen H., Quick, Lee, Strolger, Louis-Gregory, Wallace, Geoff, White, Richard L.
The Hubble Source Catalog is designed to help optimize science from the Hubble Space Telescope by combining the tens of thousands of visit-based source lists in the Hubble Legacy Archive into a single master catalog. Version 1 of the Hubble Source Ca
Externí odkaz:
http://arxiv.org/abs/1602.04861
Autor:
Downes, Ronald A., Webbink, Ronald F., Shara, Michael M., Ritter, Hans, Kolb, Ulrich, Duerbeck, Hilmar W.
Publikováno v:
The Journal of Astronomical Data 11, 2 (2005)
The Catalog and Atlas of Cataclysmic Variables has been a staple of the CV community for over 10 years. The catalog has grown from 751 CVs in 1993 to 1600 CVs at present. The catalog became a ``living'' edition in 2001, and its contents have been con
Externí odkaz:
http://arxiv.org/abs/astro-ph/0602278
Publikováno v:
Astron.J. 128 (2004) 2288
There are extraordinarily few far ultraviolet observations of RR Lyrae stars in the literature. We present Hubble Space Telescope FUV (~1600 A) imaging of the core of the globular cluster NGC 1851. Eleven new variables whose light curves are consiste
Externí odkaz:
http://arxiv.org/abs/astro-ph/0408260
Autor:
Downes, Ronald A., Margon, Bruce, Anderson, Scott F., Harris, Hugh C., Knapp, G. R., Schroeder, Josh, Schneider, Donald P., York, Donald. G., Pier, Jeffery R., Brinkman, J.
Publikováno v:
Astron.J. 127 (2004) 2838
A search of more than 3,000 square degrees of high latitude sky by the Sloan Digital Sky Survey has yielded 251 faint high-latitude carbon stars (FHLCs), the large majority previously uncataloged. We present homogeneous spectroscopy, photometry, and
Externí odkaz:
http://arxiv.org/abs/astro-ph/0402118
Publikováno v:
Astron.J. 123 (2002) 3255
We find convincing observational evidence to confirm the optical identification of the X-ray burster X1746-370 located in the globular cluster NGC6441. Chandra/HRC-I imaging yields a much improved X-ray position for the source, which we show to be fu
Externí odkaz:
http://arxiv.org/abs/astro-ph/0201550
The evolution of the luminosity of nova shells in the century following the nova outburst is studied for the lines H-alpha, H-beta, and [O III]. About 1200 flux measurements from 96 objects have been collected from the literature, from unpublished ob
Externí odkaz:
http://arxiv.org/abs/astro-ph/0112538
Publikováno v:
Astrophys.J. 550 (2001) L155
We have obtained exposures of the field of X0512-401 in the globular cluster NGC1851, in X-rays with the Chandra X-ray Observatory, and in the far-UV with the Hubble Space Telescope. We derive an accurate new X-ray position within ~1" for X0512-401,
Externí odkaz:
http://arxiv.org/abs/astro-ph/0102395
Autor:
Downes, Ronald A., Duerbeck, Hilmar W.
An optical imaging study of recent 30 novae has been undertaken using both ground-based and space-based observations. Resolved shells have been detected around 9 objects in the ground-based data, while another four objects have shells detected by HST
Externí odkaz:
http://arxiv.org/abs/astro-ph/0006458
Publikováno v:
Astron.J. 118 (1999) 2888
Despite indications that classical cataclysmic variable (CV) stars are rare in globular clusters in general, and in the cluster NGC 6624 in particular, we have serendipitously discovered such a star ~6'' from the cluster center. A Hubble Space Telesc
Externí odkaz:
http://arxiv.org/abs/astro-ph/9909344
Publikováno v:
Astrophys.J. 493 (1998) 775
We report results from Hubble Space Telescope WFPC2 imaging of the field of the luminous, bursting X-ray source in the globular cluster NGC 6441. Although the X-ray position is known to a precision of a few arcseconds, this source is only ~6'' from t
Externí odkaz:
http://arxiv.org/abs/astro-ph/9704157