1997A&A...328..211N


Query : 1997A&A...328..211N

1997A&A...328..211N - Astronomy and Astrophysics, volume 328, 211-218 (1997/12-1)

Are the Bulge C-stars related to the Sagittarius dwarf galaxy?

NG Y.K.

Abstract (from CDS):

Part of the mystery around the Bulge carbon stars from Azzopardi et al. (1991A&AS...88..265A) is solved, if they are related to the Sagittarius dwarf galaxy. The carbon stars are in that case not metal-rich as previously thought, but they have a metallicity comparable to the LMC, with an age between 0.1-1Gyr. A significant fraction of the carbon stars still have luminosities fainter than the lower LMC limit of Mbol≃-3.5mag. A similar trend is present among some of the carbon stars found in other dwarf spheroidals, but they do not reach a limit as faint as Mbol≃-1.4mag found for the SMC. At present, the TP-AGB models cannot explain the origin of carbon stars with Mbol>-3.5mag through a single-star evolution scenario, even if they form immediately after entering the TP-AGB phase. Mass transfer through binary evolution is suggested as a possible scenario to explain the origin of these low luminosity carbon stars.

Abstract Copyright:

Journal keyword(s): stars: carbon - evolution - Hertzsprung-Russell (HR) diagram - galaxies: individual: Sagittarius dwarf - Local Group - Galaxy center

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 76846 C* 08 59 48.9396931920 +33 46 26.478155532   10.71 9.42     C-R2+IIIa: 50 0
2 NGC 6522 GlC 18 03 34.08 -30 02 02.3   10.68 9.48     ~ 496 1
3 NGC 6558 GlC 18 10 18.38 -31 45 48.6   12.39 11.29     ~ 206 0
4 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1948 2
5 NAME Galactic Bulge reg ~ ~           ~ 3846 0

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2022.05.24-01:52:40

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