子女
发表于 2025-3-23 12:51:56
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agglomerate
发表于 2025-3-23 15:39:58
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民间传说
发表于 2025-3-23 18:04:58
Two-Colour Photometry of RR Lyrae Variables in NGC 6981 in the class of intermediate-to-high metal abundance clusters such as M3. The colour-magnitude diagram shows a horizontal branch populated on both sides of the variable star region. Previous work on the periods of the variables has indicated that the cluster is of Oosterhoff type I, with . day. Som
Generic-Drug
发表于 2025-3-24 00:46:42
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ITCH
发表于 2025-3-24 02:29:37
Two-Color Observations of RR Lyrae Stars in M14 shown, and it is noted that there is a lack of horizontal branch stars to the red of the variable star gap. Color-amplitude, period-amplitude and color-period relations for the RR Lyrae variables measured are shown.
压碎
发表于 2025-3-24 08:05:16
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大量杀死
发表于 2025-3-24 11:36:15
Period and Period Changes of RR Lyrae Variables in M15 of cycles from the time of Bailey’s observations to the present day cannot always be made unambiguously, there is a corresponding uncertainty in the nature and amount of the period changes. Good lightcurves are obtained even when the periods used for their reduction are incorrect because the number
傲慢物
发表于 2025-3-24 15:37:14
Period Changes as Evidence for Evolution in , Cennge sign that they cannot possibly be attributed to stellar evolution. If you are wondering how this report can dare to make a contradictory claim read the title carefully. It does not promise that there really is evidence for evolution in Omega Centauri. It only proposes to look at the period chang
修剪过的树篱
发表于 2025-3-24 22:41:55
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Abrade
发表于 2025-3-25 02:34:39
Observations of Faint Globular Clusterses taken with the Schmidt telescope of the Vatican Observatory. After an extensive discussion the authors concluded that the object was either a peculiar globular cluster at an estimated distance of 63 kpc or an old galactic cluster at a distance of the order of 16 kpc.