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THE MAIN-SEQUENCE STARS OF THE SAGITTARIUS DWARF GALAXY

机译:射手座星云星系的主序星

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The Sagittarius dwarf galaxy (SDG) is visible in the background field of the globular cluster M55. We present a deep VI color-magnitude diagram (CMD) of M55, which shows a prominent sequence of stars some 3.5 mag below the cluster main sequence. Through a comparison with a similar CMD for the globular cluster M4, we show that the M55 background field is not the Galactic bulge or spheroid. The SDG main sequence is almost as blue as that of M55 and thus, if it is metal rich, it must be younger than M55, a typical old Galactic globular cluster. The results from isochrone fitting indicate that the age of the SDG is 10-14 Gyr, similar to the ages inferred for the two associated globular clusters Ter 7 and Arp 2.
机译:在球状星团M55的背景场中可以看到人马座矮星系(SDG)。我们展示了M55的深层VI色度图(CMD),该图显示了星团主序列下方约3.5 mag处的突出恒星序列。通过与球状星团M4的类似CMD比较,我们表明M55背景场不是银河系凸起或球体。 SDG主序列几乎与M55一样蓝,因此,如果它富含金属,它必须比典型的旧Galactic球状星团M55年轻。等时线拟合的结果表明,SDG的年龄为10-14 Gyr,类似于两个相关的球状星团Ter 7和Arp 2的推断年龄。

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