Results 1 to 10 of about 499,224 (333)

Blue Horizontal Branch Stars in M92 [PDF]

The Astronomical Journal, 1997
14 pages with 2 figures, LateX, to be published in the Astronomical ...
Cohen, J. G., McCarthy, J. K.
openaire   +3 more sources

Analysis on economic benefits of coalbed methane drilling technologies

Petroleum Exploration and Development, 2009
The coalbed methane (CBM) development activities in China are concentrated in the regions with low-permeability coal reservoirs. There are two kinds of drilling technologies: one is the conventional vertical well technology, the other is multi-branch ...
Luo Dongkun, Chu Wangtao, Wu Xiaodong, Li Weichao   +3 more
doaj   +1 more source

The Stellar Populations of the Carina Dwarf Spheroidal Galaxy: I. a New Color-Magnitude Diagram for the Giant and Horizontal Branches

, 1994
We report on the first in a series of studies of the Carina dwarf spheroidal galaxy, a nearby satellite of our Galaxy. Our two major results are: 1) precise BI photometry ($\sigma_{B-I} \simlt 0.05$ for $V \simlt 22$) for 11,489 stars in the Carina field,
Hesser, J. E., Lehnert, M. D., Smecker-Hane, T. A., Stetson, P. B.   +3 more
core   +1 more source

The distance to the Fornax Dwarf Spheroidal Galaxy [PDF]

, 2007
A large multicolour, wide-field photometric database of the Fornax dwarf spheroidal galaxy has been analysed using three different methods to provide revised distance estimates based on stellar populations in different age intervals.
Aaronson, Aaronson, Azzopardi, Battaglia, Bellazzini, Bellazzini, Bersier, Bersier, Buonanno, Buonanno, Cacciari, Carretta, Carretta, Cole, Da Costa, Demers, E. V. Held, Ferraro, Ferraro, Girardi, Girardi, Greco, Greco, Gullieuszik, I. Saviane, L. Rizzi, Landolt, Lee, M. Gullieuszik, Makarov, Méndez, Paczynski, Pietrzyński, Pietrzyński, Pont, R. B. Tully, Rizzi, Rizzi, Rocha-Pinto, Rocha-Pinto, Sakai, Saviane, Schlegel, Stanek, Stetson, Stetson, Stone, Tolstoy, Tolstoy, Udalski, Udalski, Udalski, Udalski, Udalski, Valdes, Zinn   +55 more
core   +1 more source

Probing the Stellar Populations and Star Formation History of Early-type Galaxies at 0 < z < 1.1 in the Rest-frame Ultraviolet

The Astrophysical Journal
We measure the evolution of the rest-frame near-ultraviolet (NUV)− V colors for early-type galaxies in clusters at 0 < z < 1.1 using data from the Hyper Suprime-Cam Subaru Strategic Program, CFHT Large Area U -band Deep Survey, and local Sloan Digital ...
Sadman S. Ali, Roberto De Propris, Chul Chung, Steven Phillipps, Malcolm N. Bremer, Masato Onodera, Marcin Sawicki, Guillaume Desprez, Stephen Gwyn   +8 more
doaj   +1 more source

Metallicity of Globular Cluster M13 from VI CCD Photometry [PDF]

Journal of Astronomy and Space Sciences, 2000
From the VI images of M13, obtained by using 2K CCD camera and the BOAO 1.8m telescope, we derive the (V-I)-V CMD of M13. From the shapes of red giant branch, the magnitude of horizontal branch, and the giant branch bump on the constructed CMD, we ...
Young-Jong Sohn
doaj  

The ages of stars: The horizontal branch [PDF]

Proceedings of the International Astronomical Union, 2008
AbstractHorizontal branch (HB) stars play a particularly important role in the “age debate,” since they are at the very center of the long-standing “second parameter” problem. In this review, I discuss some recent progress in our understanding of the nature and origin of HB stars.
openaire   +2 more sources

Hot subdwarf stars in close-up view - II. Rotational properties of single and wide binary subdwarf B stars

, 2012
Subluminous B stars (sdBs) form the extremely hot end of the horizontal branch and are therefore related to the blue horizontal branch (BHB) stars. While the rotational properties of BHB stars have been investigated extensively, studies of sdB stars have
Bear, Behr, Behr, Behr, Behr, Berger, Billères, Billères, Blanchette, Brown, Caloi, Carney, Carney, Charpinet, Charpinet, Charpinet, Charpinet, Charpinet, Copperwheat, de Marchi, Deca, Dorman, D’Cruz, Edelmann, Edelmann, Eisenstein, Fabbian, Fontaine, For, Geier, Geier, Geier, Geier, Geier, Geier, Geier, Gourgouliatos, Green, Green, Green, Grundahl, Han, Han, Han, Han, Heber, Heber, Heber, Heber, Hirsch, Iben, Jeffery, Kawaler, Kilkenny, Kilkenny, Kinman, Koen, Lemke, Lisker, Marietta, Maxted, Maxted, Mengel, Michaud, Michaud, Morales-Rueda, Napiwotzki, Napiwotzki, Napiwotzki, Napiwotzki, Napiwotzki, O’Donoghue, Pace, Peterson, Peterson, Peterson, Peterson, Politano, Przybilla, Quievy, Randall, Recio-Blanco, Recio-Blanco, S. Geier, Saffer, Sills, Silvotti, Soker, Ströer, Sweigart, Telting, U. Heber, Unglaub, van Grootel, van Grootel, Vink, Webbink, Østensen, Østensen   +98 more
core   +1 more source

Gaps in the blue horizontal branch.

The Astrophysical Journal, 1976
Data leads to the conclusion that several distinct groups of stars exist on the field stars horizontal branch sequence. Consideration of current understanding of the advanced evolution of Population II stars indicates that, if Greenstein's (1971) ''extended horizontal-branch'' hypothesis is correct, these discrete horizontal-branch groups correspond to
B. Newell, J. A. Graham
openaire   +1 more source

Photometric identification of blue horizontal branch stars

, 2010
We investigate the performance of some common machine learning techniques in identifying BHB stars from photometric data. To train the machine learning algorithms, we use previously published spectroscopic identifications of BHB stars from SDSS data.
Abazajain, Adelman-McCarthy, Bailer-Jones, C. A. L. Bailer-Jones, Cortes, Dorman, Gao, Harris, Hayfield, Huertas-Company, K. W. Smith, Kinman, Marengo, R. J. Klement, Richards, Richards, Schlegel, Sirko, Tsalmantza, Tsalmantza, X. X. Xue, Xue, Xue, Yanny   +23 more
core   +2 more sources