1997A&AS..125....1K


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.21CEST13:49:58

1997A&AS..125....1K - Astron. Astrophys., Suppl. Ser., 125, 1-9 (1997/October-1)

NTT CCD photometry of the globular cluster M 79 = NGC 1904 in UBV.

KRAVTSOV V., IPATOV A., SAMUS N., SMIRNOV O., ALCAINO G., LILLER W. and ALVARADO F.

Abstract (from CDS):

We have obtained new CCD photometry (with short exposures) of the Milky Way globular cluster M 79 using the NTT under excellent seeing. The main-sequence turnoff point is at V=19.70±0.05, B-V=0.415±0.010; the horizontal-branch level at the blue edge of the instability strip is V=16.25±0.10. The cluster metallicity, estimated from the positions of the "bump" on the red giant branch, is [Fe/H] =-1.76±0.20. We discuss the luminosity functions of the horizontal branch and the asymptotic giant branch, in particular, the fragmentary structure of the horizontal branch in M 79 and in other clusters. Our isochrone analysis shows that M 79 belongs to the oldest Milky Way globular clusters. Its age, in the scale of Bergbusch & VandenBerg (1992ApJS...81..163B) oxygen-enhanced isochrones, is 16±1Gyr, and in the scale of VandenBerg & Bell (1985ApJS...58..561V) isochrones it is 18±1Gyr. The cluster has an extremely blue horizontal branch at intermediate metallicity and may be considered a good example of the "second parameter" interpreted as age. The apparent distance modulus of the cluster from Bergbusch and VandenBerg isochrones is in good agreement with the value derived from the position of the horizontal branch (15.6mag).

Abstract Copyright:

Journal keyword(s): globular clusters: individual: M 79 - HR diagram

VizieR on-line data: <Available at CDS (J/A+AS/125/1): table2>

Nomenclature: Table 2: Cl* NGC 1904 KIS NNNN (Nos 1-2451)

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 948 0
2 NGC 1841 GlC 04 45 23 -83 59.8   12.23 11.43     ~ 174 0
3 M 79 GlC 05 24 10.59 -24 31 27.3   9.21 8.16     ~ 734 0
4 NGC 5466 GlC 14 05 27.29 +28 32 04.0   10.5 9.70     ~ 746 0
5 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 321 0
6 NGC 6139 GlC 16 27 39.987 -38 50 57.03   11.03 9.68     ~ 184 0
7 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2043 0
8 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1845 0

    Equat.    Gal    SGal    Ecl

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2021.04.21-13:49:58

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