Results 101 to 110 of about 30,972 (238)

The Isaac Newton Telescope Monitoring project: Stellar population in the IC 10 dwarf irregular galaxy [PDF]

Iranian Journal of Astronomy and Astrophysics, 2019
We have conducted an optical monitoring survey of IC 10 dwarf irregular galaxy in the Local Group, using the Isaac Newton Telescope (INT) with the wide-field camera (WFC), to identify the Asymptotic Giant Branch stars (AGBs).
Mahtab Gholami, Mohammad Taghi Mirtorabi
doaj   +1 more source

Large Amplitude Photometric Variability of the Candidate Protoplanet TMR-1C

, 2010
In their HST/NICMOS observations, Terebey et al. 1998 detected a candidate protoplanet, TMR-1C, that lies at a separation of about 10" (~1000 AU) from the Class I protobinary TMR-1 (IRAS 04361+2547).
Allard, B. Riaz, Barrado y Navascués, Barrado y Navascués, Bate, Bouvier, Béjar, Caballero, Caballero, Carpenter, Carpenter, Close, Comerón, Doppmann, Ducourant, E. L. Martín, Hawkins, Kama, Kraus, Kusakabe, Luhman, Luhman, Luhman, Marley, Martín, Minniti, Park, Persson, Scholz, Scholz, Terebey, Terebey, Terebey, Winn, Zapatero Osorio, Zapatero Osorio   +35 more
core   +1 more source

X-Ray and Infrared Analysis on a Faint Polar RX J1745.5-2905

The Astrophysical Journal
RX J1745.5-2905 is a faint and distant polar below the period gap. It was observed intensively in X-ray by Chandra, and its X-ray data reveal frequent brightness transitions between low and high states like we found in the prototype star AM Her.
Qishan Wang, Xiaohui Fang, Shengbang Qian   +2 more
doaj   +1 more source

Photometry and spectroscopy of faint candidate spectrophotometric standard DA white dwarfs [PDF]

, 2019
We present precise photometry and spectroscopy for 23 candidate spectrophotometric standard white dwarfs. The selected stars are distributed in the Northern hemisphere and around the celestial equators and are all fainter than r ~ 16.5 mag.
Axelrod, T., Bohlin, R., Calamida, A., Claver, J., Deustua, S., Holberg, J., Hubeny, I., Mackenty, J., Matheson, T., Narayan, G., Olszewski, E., Points, S., Rest, A., Sabbi, E., Saha, A., Shanahan, C., Stubbs, C. W.   +16 more
core   +2 more sources

The first direct detection of a gravitational micro-lens toward the Galactic bulge

, 2007
We present a direct detection of the gravitational lens that caused the microlensing event MACHO-95-BLG-37. This is the first fully resolved microlensing system involving a source in the Galactic bulge, and the second such system in general. The lens and
A. Wood, Baraffe I., Bessell M. S., Chang K., Kozlowski S., P. R. Woźniak, Perryman M. A. C., S. Kozłowski, S. Mao, Udalski A., Wozniak P.   +10 more
core   +1 more source

Absolute Flux Calibration of the IRAC Instrument on the Spitzer Space Telescope using Hubble Space Telescope Flux Standards [PDF]

, 2011
The absolute flux calibration of the James Webb Space Telescope will be based on a set of stars observed by the Hubble and Spitzer Space Telescopes. In order to cross-calibrate the two facilities, several A, G, and white dwarf (WD) stars are observed ...
A. Noriega-Crespo, Aldering, Asplund, Aufdenberg, Bessel, Bohlin, Bohlin, Bohlin, Bohlin, Bohlin, Bohlin, Bohlin, Bohlin, Bohlin, C. Engelbracht, Castelli, Cohen, Cohen, Cohen, D. Ardila, De Jong, De Marchi, Engelke, Fazio, Finley, G. H. Rieke, Gianninas, Gilliland, H. C. Ferguson, Hayes, Houck, J. Kalirai, K. D. Gordon, K. Flanagan, K. Y. L. Su, Kaiser, Kent, Koornneef, M. Meixner, Maíz Apellániz, Megessier, P.-E. Tremblay, Price, R. C. Bohlin, Rieke, Rieke, Rieke, S. Carey, S. Deustua, Smith, Su, Tremblay, Werner   +52 more
core   +2 more sources

ИССЛЕДОВАНИЕ АКТИВНОСТИ ЯДРА СЕЙФЕРТОВСКОЙ ГАКТИКИ NGC 7469 ЗА ПЕРИОД НАБЛЮДЕНИЙ С1990-2008 ГГ.

Odessa Astronomical Publications, 2011
We combine many published photometrical observations of the Seyfert Galaxy (SG) NGC 7469 and also new results from Hubble Space Telescope which can be used for future research of some properties of the activity of the nuclear of the SG.
Л. С. Уголькова, Б. П. Артамонов   +1 more
doaj   +1 more source

The absolute age of the globular cluster M15 using near-infrared adaptive optics images from PISCES/LBT [PDF]

, 2015
We present deep near-infrared (NIR) J, Ks photometry of the old, metal-poor Galactic globular cluster M\,15 obtained with images collected with the LUCI1 and PISCES cameras available at the Large Binocular Telescope (LBT).
Arcidiacono, C., Bono, G., Boutsia, K., Briguglio, R., Busoni, L., Carini, R., Close, L., Cresci, G., Esposito, S., Ferraro, I., Fini, L., Fiorentino, G., Fumana, M., Guerra, J. C., Hill, J., Iannicola, G., Kulesa, C., Mannucci, F., Massari, D., McCarthy, D., Monelli, M., Pinna, E., Puglisi, A., Quiros-Pacheco, F., Ragazzoni, R., Riccardi, A., Skemer, A., Testa, V., Xompero, M.   +28 more
core   +3 more sources

Ages of M33 Star Clusters Based on the HST/WFPC2 Photometry

, 2009
We present a result of age estimation for star clusters in M33. We obtain color-magnitude diagrams (CMDs) of resolved stars in 242 star clusters from the HST/WFPC2 images. We estimate ages of 100 star clusters among these, by fitting the Padova theoretical isochrones to the observational CMDs. Age distribution of the star clusters shows a dominant peak
Park, Won-Kee, Park, Hong Soo, Lee, Myung Gyoon   +2 more
openaire   +2 more sources

Resolving the L/T transition binary SDSS J2052-1609 AB

, 2010
Binaries provide empirical key constraints for star formation theories, like the overall binary fraction, mass ratio distribution and the separation distribution.
B. Goldman, Bouy, Bouy, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Chiu, Devillard, Eggenberger, Faherty, Fischer, Gizis, Goldman, H. Bouy, K. Geißler, Kirkpatrick, Knapp, Konopacky, Köhler, Liu, Looper, M. B. Stumpf, Martín, Martín, Stumpf, Th. Henning, Tinney, W. Brandner   +29 more
core   +1 more source