منابع مشابه
Extended Star Formation in Dwarf Spheroidal Galaxies: the Cases of Draco, Sextans, and Ursa Minor
Star formation and chemical enrichment histories of the dwarf spheroidal galaxies (dSphs) Draco, Sextans, and Ursa Minor are investigated by means of chemical evolution models and a simulation code for colour-magnitude diagrams (CMDs). The CMD simulation code is designed to fully consider effects of the chemical evolution on stellar evolution and photometric properties. For this aim, star forma...
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We report photometry and spectroscopy of the evolution of Nova Sagittarii 1994 #1 (V4332 Sagittarii) during outburst. We compare the photometric and spectral evolution of this outburst to known classes of outbursts – including classical novae and outbursts occurring on symbiotic stars – and find this object does not conform to any known class of outburst. The closest match to the behavior of th...
متن کامل1 v 1 1 A ug 1 99 8 The Recent Star Formation in Sextans A
We investigate the relationship between the spatial distributions of stellar populations and of neutral and ionized gas in the Local Group dwarf irregular galaxy Sextans A. This galaxy is currently experiencing a burst of localized star formation, the trigger of which is unknown. We have resolved various populations of stars via deep UBV (RI)C imaging over an area with diameter ∼ 5.3. We have c...
متن کاملDeep Hst Imaging of Sextans A. Iii. the Star Formation History
– 2 – We present a measurement of the star formation history of Sextans A, based on WFPC2 photometry that is 50% complete to V = 27.5 (M V ∼ +1.9) and I = 27.0. The star formation history and chemical enrichment history have been measured through modeling of the CMD. We find evidence for increased reddening in the youngest stellar populations and an intrinsic metallicity spread at all ages. Sex...
متن کاملDeep Hst Imaging of Sextans a I. the Spatially Resolved Recent Star Formation History
X iv :a st ro -p h/ 01 10 25 7v 1 1 0 O ct 2 00 1 Deep HST Imaging of Sextans A I. The Spatially Resolved Recent Star Formation History Robbie C. Dohm-Palmer Astronomy Department, University of Michigan, Ann Arbor, MI 48109 [email protected] Evan D. Skillman Astronomy Department, University of Minnesota, Minneapolis, MN 55455 [email protected] Mario Mateo Astronomy Department, U...
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ژورنال
عنوان ژورنال: Nature
سال: 1875
ISSN: 0028-0836,1476-4687
DOI: 10.1038/012026b0