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| 1988 Revised MK Spectral Standards for Stars GO and Later
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| 1985 revised MK spectral standards : stars GO and later
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| Revised MK spectral types for G, K, and M stars
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| A photoelectric measurement of magnesium for late-type stars
A photoelectric index of MgH + Mg b for late-type stars has been createdby the addition of one filter bandpass to the DDO system. Measurementsshow that this index has good sensitivity to surface gravity for Kstars, and suggest that it can differentiate metal-poor halo giants fromdisk stars. From this index, involving measurement through two filtersalone, it appears that membership can be determined for stars on thegiant branch of globular clusters. It is possible that the index couldbe used, after calibration with cluster giants, to determine ages ofgiant stars in the field.
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Membre dels grups següents:
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Dades d'Observació i Astrometria
| Constel·lació: | Vela |
| Ascensió Recta: | 08h38m43.31s |
| Declinació: | -47°47'16.3" |
| Magnitud Aparent: | 7.888 |
| Distancia: | 934.579 parsecs |
| Moviment propi RA: | -2.4 |
| Moviment propi Dec: | 5.8 |
| B-T magnitude: | 10.439 |
| V-T magnitude: | 8.099 |
Catàlegs i designacions:
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