Results 11 to 20 of about 12,545 (267)

Dwarf Cepheids in the Carina Dwarf Spheroidal Galaxy [PDF]

The Astronomical Journal, 1998
We have discovered 20 dwarf Cepheids (DC) in the Carina dSph galaxy from the analysis of individual CCD images obtained for a deep photometric study of the system.
Arnold R., Bertelli G., Cannon R. D., Denise Hurley-Keller, Dworetsky M. M., James Nemec, Lynden-Bell D., Mario Mateo, Mighell K. J., Smecker-Hane T. A.   +9 more
core   +7 more sources

The Dynamical and Chemical Evolution of Dwarf Spheroidal Galaxies [PDF]

Astronomy & Astrophysics, 2009
We present a large sample of fully self-consistent hydrodynamical Nbody/Tree-SPH simulations of isolated dwarf spheroidal galaxies (dSphs). It has enabled us to identify the key physical parameters and mechanisms at the origin of the observed variety in ...
A. Helmi, Alimi, B. Letarte, Babusiaux, Barkana, Barnes, Battaglia, Battaglia, Battaglia, Blais-Ouellette, Bosler, Bullock, Carraro, Coleman, de Blok, de Blok, de Blok, Dekel, Dolphin, E. Tolstoy, Efstathiou, Ferrara, Fukushige, G. Battaglia, Gallagher, Galli, Geisler, Gentile, Gentile, Gilmore, Gingold, Harbeck, Helmi, Hensler, Hernquist, Hernquist, Hurley-Keller, Ikuta, Irwin, K. A. Venn, Katz, Katz, Kawata, Kirby, Kleyna, Kobayashi, Koch, Koch, Kodama, Kroupa, Lanfranchi, Lee, Leitherer, Lucy, M. D. Shetrone, M. Irwin, Mac Low, Maio, Maraston, Maraston, Marcolini, Marcolini, Martin, Mateo, Mayer, Mighell, Monaghan, Moore, Mori, Mori, Murakami, Muñoz, Navarro, P. Jablonka, Peñarrubia, Poirier, Poirier, Read, Ricotti, Salpeter, Salvadori, Schmidt, Serna, Shetrone, Shetrone, Shetrone, Shetrone, Spano, Spekkens, Springel, Stinson, Stinson, Strigari, Sutherland, Swaters, T. Sawala, Tinsley, Tolstoy, Tolstoy, Tsujimoto, V. Hill, Valcke, Walker, Walker, Walker, Wise, Y. Revaz   +106 more
core   +11 more sources

The Andromeda Dwarf Spheroidal Galaxies [PDF]

Symposium - International Astronomical Union, 1999
Our current knowledge of M31's dwarf spheroidal companions is reviewed. Two topics of recent interest constitute the bulk of this review. First, color-magnitude diagrams reaching below the horizontal branch have been constructed for two M31 dwarf spheroidals, based on images from HST/WFPC2. The horizontal branches are predominantly red in both galaxies,
T. E. Armandroff, G. S. Da Costa
openalex   +4 more sources

The Progenitors of Dwarf Spheroidal Galaxies [PDF]

The Astronomical Journal, 2003
Dwarf spheroidal (dSph) galaxies present an evolutionary puzzle that we explore in 40 early- and late-type dwarfs in the Local Group and nearby field. Although dSphs formed stars over extended periods, today all but one are free of detectable interstellar matter (ISM), even in the Fornax dSph, where stars still formed 100 Myr ago.
E. K. Grebel, J. S. Gallagher, Daniel Harbeck   +2 more
openalex   +5 more sources

Implications of Elemental Abundances in Dwarf Spheroidal Galaxies [PDF]

Astronomy & Astrophysics, 2005
Unusual elemental abundance patterns observed for stars belonging to nearby dwarf spheroidal (dSph) galaxies are discussed. Analysis of the [alpha/H] vs.
Alves, Audouze, Bonifacio, Cayrel, Chen, Cohen, Edvardsson, Feltzing, Fryer, Geisler, Gilmore, Grebel, Hanson, Heger, Heger, Hill, Hill, Hirschi, Hirschi, Ikuta, Ishimaru, Korn, Lanfranchi, Law, Maeda, Maeder, Mateo, Matteucci, McWilliam, McWilliam, McWilliam, Meynet, Monaco, Nagataki, Nissen, Penny, Robertson, Shetrone, Shetrone, Shigeyama, Shigeyama, Smith, T. Tsujimoto, Thielemann, Tolstoy, Tolstoy, Travaglio, Tsujimoto, Tsujimoto, Tsujimoto, Umeda, Van Dyk, Venn, Wheeler, Yamada   +54 more
core   +3 more sources

Manganese in dwarf spheroidal galaxies [PDF]

Astronomy & Astrophysics, 2012
19 pages, 10 figures, accepted for publication in Astronomy & ...
Mike Irwin, Kim A. Venn, G. Cescutti, G. Cescutti, Matthew Shetrone, P. François, Giuseppina Battaglia, Eline Tolstoy, Pascale Jablonka, Pascale Jablonka, Francesca Primas, B. Lemasle, Pierre North, Vanessa Hill, B. Letarte   +14 more
openaire   +6 more sources

Laboratory exploration of mineral precipitates from Europa's subsurface ocean

Journal of Applied Crystallography, Volume 54, Issue 5, Page 1455-1479, October 2021., 2021
Precipitation experiments from a model Europan ocean solution subjected to fast and slow freezing suggest that the highly hydrated Na–Mg sulfate phase Na2Mg(SO4)2·16H2O is one of the lowest‐temperature mineral phases likely to be stable on Europa's surface and may therefore be astrobiologically significant.The precipitation of hydrated phases from a ...
Stephen P. Thompson, Hilary Kennedy, Benjamin M. Butler, Sarah J. Day, Emmal Safi, Aneurin Evans   +5 more
wiley   +1 more source

1I/‘Oumuamua as an N2 Ice Fragment of an Exo‐Pluto Surface II: Generation of N2 Ice Fragments and the Origin of ‘Oumuamua

Journal of Geophysical Research: Planets, Volume 126, Issue 5, May 2021., 2021
Abstract The origin of the interstellar object 1I/‘Oumuamua has defied explanation. In a companion paper (Jackson & Desch, 2021), we show that a body of N2 ice with axes 45 m × 44 m × 7.5 m at the time of observation would be consistent with its albedo, nongravitational acceleration, and lack of observed CO or CO2 or dust.
S. J. Desch, A. P. Jackson
wiley   +1 more source

Supernova Enrichment of Dwarf Spheroidal Galaxies [PDF]

The Astrophysical Journal, 2003
29 pages, 10 figures, to appear in Astrophysical ...
P. Chris Fragile, Stephen Murray, Peter Anninos, D. N. C. Lin   +3 more
openalex   +5 more sources

Dwarf Spheroidal Galaxies in the Virgo Cluster [PDF]

The Astrophysical Journal, 1998
We present a study of the smallest and faintest galaxies found in a very deep photographic R band survey of regions of the Virgo Cluster, totalling over 3 square degrees, made with the UK Schmidt Telescope. The objects we detect have the same physical sizes and surface brightnesses as Local Group dwarf spheroidal galaxies.
Jones, JB, Phillipps, S, Schwartzenberg, JM, Parker, QA   +3 more
openaire   +6 more sources