Results 1 to 10 of about 53,271 (216)

Crowded-field photometry from HST-imaging [PDF]

, 1997
We present a thorough investigation of stellar photometry based on HST imaging of crowded fields at 85 and 10 arcsec from the centre of the high-surface brightness elliptical M32. The Principal Investigators of the present archive data have elsewhere presented an impressive colour-magnitude diagram of the field at 85 arcsec.
Marianne Sodemann, B. Thomsen
arxiv   +6 more sources

HST NIC3 Photometry of Metal-Rich Globular Clusters Palomar 6, Liller 1, and 47 Tuc (NGC 104) [PDF]

Journal of Astronomy and Space Sciences, 2004
We present HST NIC3 photometry of metal-rich globular clusters Palomar 6, Liller 1 and 47 Tuc (NGC 104). We discuss the interstellar reddening law for the HST NICMOS F110W/F160W photometric system which depends on the temperature of the source.
Jae-Woo Lee
doaj   +3 more sources

A 1.3% Distance to M33 from Hubble Space Telescope Cepheid Photometry [PDF]

The Astrophysical Journal, 2023
We present a low-dispersion period–luminosity relation (PL) based on 154 Cepheids in Messier 33 (M33) with Hubble Space Telescope (HST) photometry from the PHATTER survey.
Louise Breuval, Adam G. Riess, Lucas M. Macri, Siyang Li, Wenlong Yuan, Stefano Casertano, Tarini Konchady, Boris Trahin, Meredith J. Durbin, Benjamin F. Williams   +9 more
doaj   +2 more sources

HST Photometry of 47 Tuc and Analysis of the Stellar Luminosity Function in Milky-Way Clusters [PDF]

, 1996
We present V and I photometry for a field 5' from the center of 47 Tuc. The field was imaged with the HST WFPC2 as part of the Medium Deep Survey project. The luminosity function (LF) continually rises in the domain $5 < M_I < 9$ with a slope $\Delta log \Phi (M) / \Delta M \sim 0.15$ and then drops off sharply.
B. X. Santiago, R. A. W. Elson, G. Gilmore   +2 more
arxiv   +3 more sources

The CALSPEC Stars P177D and P330E [PDF]

, 2015
Multicolor photometric data are presented for the CALSPEC stars P177D and P330E. Together with previously published photometry for nine other CALSPEC standards, the photometric observations and synthetic photometry from HST/STIS spectrophotometry agree in the B, V, R, and I bands to better than $\sim$1\% (10 mmag).
Bohlin, Ralph C., Landolt, Arlo U.
arxiv   +5 more sources

Mid-Cycle Changes in Eta Carinae [PDF]

Astronomical Journal (AJ), Vol 139, Page 2056, 2009
In late 2006, ground-based photometry of $\eta$ Car plus the Homunculus showed an unexpected decrease in its integrated apparent brightness, an apparent reversal of its long-term brightening. Subsequent HST/WFPC2 photometry of the central star in the near-UV showed that this was not a simple reversal.
Altamore, Andrea Mehner, Biretta, Cassatella, Corcoran, Davidson, Davidson, Davidson, Davidson, Davidson, Feinstein, Feinstein, Fernandez-Lajus, Hillier, Hillier, Hofmann, Humphreys, Humphreys, Ishibashi, John C. Martin, Kashi, Kashi, Koornneef, Kris Davidson, Martin, Martin, Martin, Martin, Mattei, Mehner, Nielsen, Osterbrock, Pian, Roberta M. Humphreys, Smith, Smith, Soker, Sterken, van Genderen, Weigelt   +39 more
arxiv   +3 more sources

Late-Time HST Photometry of SN 1994I: Hints of Positron Annihilation Energy Deposition [PDF]

Publ.Astron.Soc.Pac.120:290-300,2008, 2008
We present multicolor Hubble Space Telescope (HST) WFPC2 broadband observations of the Type Ic SN 1994I obtained approximately 280 days after maximum light. We measure the brightness of the SN and, relying on the detailed spectroscopic database of SN 1994I, we transform the ground-based photometry obtained at early times to the HST photometric system ...
A. Clocchiatti, J. C. Wheeler, R. Kirshner, David Branch, Peter Challis, Roger A. Chevalier, A. V. Filippenko, Claes Fransson, P. Garnavich, B. Leibundgut, N. Panagia, M. M. Phillips, N. B. Suntzeff, Peter Höflich, José Gallardo   +14 more
arxiv   +3 more sources

Calibration of BVRI Photometry for the Wide Field Channel of the HST Advanced Camera for Surveys [PDF]

, 2011
We present new observations of two Galactic globular clusters, PAL4 and PAL14, using the Wide-Field Channel of the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST), and reanalyze archival data from a third, NGC2419. We matched our photometry of hundreds of stars in these fields from the ACS images to existing, ground-based ...
Abhijit Saha, Richard A. Shaw, J. Claver, Andrew E. Dolphin   +3 more
arxiv   +3 more sources

OGLE-2011-BLG-0462: An Isolated Stellar-mass Black Hole Confirmed Using New HST Astrometry and Updated Photometry

The Astrophysical Journal
The long-duration Galactic-bulge microlensing event OGLE-2011-BLG-0462 produced relativistic astrometric deflections of the source star, which we measured using Hubble Space Telescope (HST) observations taken at eight epochs over ∼6 yr.
Kailash C. Sahu, Jay Anderson, Stefano Casertano, Howard E. Bond, Martin Dominik, Annalisa Calamida, Andrea Bellini, Thomas M. Brown, Henry C. Ferguson, Marina Rejkuba   +9 more
doaj   +2 more sources

The Gemini/HST galaxy cluster project: Redshift 0.2-1.0 cluster sample, X-ray data and optical photometry catalog [PDF]

, 2018
The Gemini/HST Galaxy Cluster Project (GCP) covers 14 z=0.2-1.0 clusters with X-ray luminosity of L_500 >= 10^44 ergs/s in the 0.1-2.4 keV band. In this paper we provide homogeneously calibrated X-ray luminosities, masses and radii, and we present the complete catalog of the ground-based photometry for the GCP clusters.
Inger Jørgensen, Kristin Chiboucas, Pascale Hibon, Louise D. Nielsen, M. Takamiya   +4 more
arxiv   +3 more sources