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Further spectroscopic evidence bearing on the M22-Omega Centauri comparison
Spectroscopic observations made at CTIO of stars from the giant-branchtip to well below the horizontal-branch level on the subgiant branch ofM22 (alpha = 18h 33m.3, delta = -23 deg 58 min/1950/, l = 9 deg, b = 8deg) provide identification of 15 new radial-velocity members, includinga second giant CH star (IV-24) and a possible subgiant CH star (III-32).In general, M22 stars show a marked range of CN strengths. These andother recent results seem consistent with the suggestion that M22 mayshare, albeit in a weaker form, some of the distinguishing anomalies ofOmega Cen.
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Observation and Astrometry data
| Constellation: | けんびきょう座 |
| Right ascension: | 21h26m54.13s |
| Declination: | -33°54'35.6" |
| Apparent magnitude: | 9.052 |
| Proper motion RA: | -3.1 |
| Proper motion Dec: | 5.2 |
| B-T magnitude: | 10.394 |
| V-T magnitude: | 9.163 |
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