2004ApJ...606..869B

Query : 2004ApJ...606..869B

2004ApJ...606..869B - Astrophys. J., 606, 869-893 (2004/May-2)

Variations in star formation history and the red giant branch tip.

BARKER M.K., SARAJEDINI A. and HARRIS J.

Abstract (from CDS):

We examine the reliability of the tip of the red giant branch (TRGB) as a distance indicator for stellar populations with different star formation histories (SFHs) when photometric errors and completeness corrections at the TRGB are small. In general, the TRGB-distance method is insensitive to the shape of the SFH except when it produces a stellar population with a significant component undergoing the red giant branch phase transition. The I-band absolute magnitude of the TRGB for the middle and late stages of this transition (∼1.3-1.7 Gyr) is several tenths of a magnitude fainter than the canonical value of MI~-4.0. If more than ∼30% of all stars formed over the lifetime of the universe are formed at these ages, then the distance could be overestimated by ∼10%-25%. Similarly, the TRGB-distance method is insensitive to the metallicity distribution of stars formed except when the average metallicity is greater than <[Fe/H]≥-0.3. If more than ∼70% of all stars formed have [Fe/H]>-0.3, the distance could be overestimated by ∼10%-45%. We find that two observable quantities, the height of the discontinuity in the luminosity function at the TRGB and the median (V-I)0at MI=-3.5, can be used to test whether the aforementioned age and metallicity conditions are met.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Distances and Redshifts - Galaxies: Dwarf - Galaxies: Stellar Content - Galaxies: Local Group

Simbad objects: 1

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Number of rows : 1
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 NAME Local Group GrG ~ ~           ~ 8443 0

Query : 2004ApJ...606..869B

Basic data :
NAME Local Group -- Group of Galaxies
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
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Other object types: 		GrG ([FWB89])
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
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    Grey values are increasing the original precision due to the computation of frame transformations
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  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) : 		No Coord.

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: 1
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NAME LG NAME Local Group [FWB89] GrG 282

References (8443 between 1850 and 2024) (Total 8443)
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