Cosmic Chemical Evolution

Передня обкладинка
K. Nomoto, J.W. Truran
Springer Science & Business Media, 31 бер. 2002 р. - 242 стор.
The open cluster NGC 6791 is now considered both the oldest and the most metal-rich known. Its age is 8 -10 Gyrs, twice as old as the canonical solar-metallicity cluster M67 (Garnavich et al. 1994; Demarque, Green, & Guenther 1992; Tripicco et al. 1995). That its metallicity is significantly above solar is suggested from moderate-resolution spectroscopy and from a mismatch of its color-magnitude diagram (CMD) with solar-metallicity isochrones. Tripicco et al. (1995) find [Fe/H] = +0.27 to +0.44. The cluster population is rich. In addition to about a dozen red giants and two dozen red horizontal-branch stars, the cluster has several very hot HB stars (Kaluzny & Udalski 1992). Liebert et al. (1994) have shown that the extremely blue stars are mostly sdB/sdO stars and at least 3 or 4 are likely cluster members, the first ever discovered in an open cluster. These may provide the key to the puzzling upturn in ultraviolet flux below 1500A seen in many high-metallicity systems (Burstein et al. 1988; Ferguson et al. & Liebert 1993).
 

Відгуки відвідувачів - Написати рецензію

Не знайдено жодних рецензій.

Зміст

I
1
II
17
III
23
IV
33
V
47
VI
57
VII
71
VIII
75
XXIX
219
XXX
220
XXXI
221
XXXII
222
XXXIII
223
XXXIV
224
XXXV
225
XXXVI
226

IX
81
X
91
XI
97
XII
103
XIII
109
XIV
117
XV
123
XVII
129
XIX
139
XX
147
XXI
153
XXII
159
XXIII
165
XXIV
175
XXV
185
XXVI
195
XXVII
201
XXVIII
209
XXXVII
227
XXXVIII
228
XXXIX
229
XL
230
XLI
231
XLII
232
XLIII
233
XLIV
234
XLV
235
XLVI
236
XLVII
237
XLVIII
238
XLIX
239
L
240
LI
241
LII
242
Авторські права

Інші видання - Показати все

Загальні терміни та фрази

Бібліографічна інформація