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| Query : 2007ApJ...659L..25M |
2007ApJ...659L..25M - Astrophys. J., 659, L25-L28 (2007/April-2)
Magnesium isotopes in metal-poor dwarfs: the rise of AGB stars and the formation timescale of the Galactic halo.
MELENDEZ J. and COHEN J.G.
Abstract (from CDS):
We have determined magnesium isotopic ratios (25,26Mg/Mg) in metal-poor (-2.6 ≤ [Fe/H] ≤ -1.3) halo dwarfs employing high signal-to-noise ratio (S/N = 90-280), high spectral resolution (R=105) Keck High Resolution Echelle Spectrometer (HIRES) spectra. Unlike previous claims of an important contribution from intermediate-mass asymptotic giant branch (AGB) stars at low metallicities, we find that the rise of the AGB contribution in the Galactic halo did not occur until intermediate metallicities ([Fe/H] ≳ -1.5).
Abstract Copyright: ∼
Journal keyword(s): Galaxy: Halo - Stars: Abundances - Stars: AGB and Post-AGB - Stars: Atmospheres - Stars: Population II
Simbad objects: 9
| Number of rows : 9 |
| N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2024 |
#notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Wolf 1504 | PM* | 00 44 32.0826556168 | +29 54 24.776192869 | 14.29 | 12.6 | G2 | 24 | 0 | |||
| 2 | G 39-36 | PM* | 04 48 06.6080283563 | +33 09 35.766171969 | 13.6 | 11.1 | ~ | 22 | 0 | |||
| 3 | Ross 382 | PM* | 04 56 23.3055657135 | +14 55 11.689059683 | 13.304 | 12.413 | 11.857 | 11.330 | G8 | 26 | 0 | |
| 4 | Ross 65 | PM* | 05 23 11.5426119579 | +33 11 01.789336652 | 12.38 | 10.7 | K2 | 43 | 0 | |||
| 5 | G 103-50 | PM* | 06 40 09.4603035743 | +28 27 00.896245230 | 12.93 | 10.9 | ~ | 19 | 0 | |||
| 6 | G 113-40 | PM* | 08 29 40.7254788239 | -01 44 47.988465128 | 12.876 | 11.930 | 11.362 | 10.822 | K3 | 52 | 0 | |
| 7 | HD 103095 | Pe* | 11 52 58.7673387755 | +37 43 07.254113125 | 7.38 | 7.20 | 6.45 | 5.80 | 5.35 | K1V_Fe-1.5 | 803 | 1 |
| 8 | G 63-40 | PM* | 13 36 47.4898852113 | +19 05 12.921173178 | 12.778 | 11.936 | 11.431 | 10.958 | ~ | 25 | 0 | |
| 9 | Wolf 1332 | PM* | 22 14 24.0020381427 | -08 44 41.960972825 | 12.615 | 11.855 | 11.320 | 10.811 | K4V | 55 | 0 |
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