2004AJ....127.2904R

Query : 2004AJ....127.2904R

2004AJ....127.2904R - Astron. J., 127, 2904-2908 (2004/May-0)

Concerning the white dwarf cooling age of M4: a reply to De Marchi et al. on ``A different interpretation of recent deep HST observations''.

RICHER H.B., BREWER J., FAHLMAN G.G., KALIRAI J., STETSON P.B., HANSEN B.M.S., RICH R.M., IBATA R.A., GIBSON B.K. and SHARA M.

Abstract (from CDS):

We respond to the recent paper by De Marchi et al. on the white dwarf cooling age of M4. The authors question the data analysis and interpretation that led to our conclusions in Hansen et al. in 2002. In their paper, De Marchi et al. are unable to obtain photometry as deep as ours from the same data set and therefore assert that only a lower limit to the white dwarf cooling age for this cluster of ∼9 Gyr can be obtained. In this brief contribution we show that shortcomings in the data analysis and reduction techniques of De Marchi et al. are responsible for their inability to reach the photometry limits that our study reports. In a forthcoming paper in which the complete techniques for age determination with white dwarfs are laid out, we demonstrate that their method of fitting the luminosity function yields a spuriously low white dwarf cooling age.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Globular Clusters: Individual: Messier Number: M4 - Techniques: Image Processing - Stars: White Dwarfs

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 - 2026	#notes
1	M 4	GlC	16 23 35.22	-26 31 32.7						~	1978	0

Query : 2004AJ....127.2904R

Basic data :

M 4 -- Globular Cluster

GlC (2013A&A,GCl), * (CD,GCRV,...), Cl* (C,[KPS2012])

16 23 35.22 -26 31 32.7 (Optical) [ ] D 2010AJ....140.1830G

16 20 31.21 -26 24 36.3 [ ]

350.97293 +15.97218 [ ]

-12.48 -18.99 [0.01 0.01 90] C 2019MNRAS.482.5138B

V(km/s) 71.0 [0.1] / z(spectroscopic) 0.000237 [0.000000] / cz 71.01 [0.10] (Opt) A 2018MNRAS.478.1520B

0.556 [0.010] C 2021MNRAS.505.5978V

26.3 26.3 90 (Opt) D 1989Sci...246.1066D

K 2.32 [~] D 2008MNRAS.389.1924F

g (AB) 5.251 [0.031] C 2014MNRAS.437.1725V

z (AB) 4.435 [0.044] C 2014MNRAS.437.1725V

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`M 4`	`CD-26 11314`	`GCRV 5569 E`	`NGC 6121`
`C 1620-264`	`GCl 41`	`HD 147552`	`[KPS2012] MWSC 2396`

References (1978 between 1850 and 2026) (Total 1978)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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Data at NED - NASA/IPAC Extragalactic Database : M 4

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CD-26 11314 HD 147552 NGC 6121

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