Release 11.12 ("Hergest Ridge")


Selected: NGC 6779

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Parameters
Positional Parameters
clusterNGC 6779
nameM 56
RA19 16 35.57
Declination+30 11 00.5
Galactic longitude62.66
Galactic latitude8.34
R sun9.4
R gc9.2
X4.3
Y8.3
Z1.4
Photometric Parameters
E (B-V)0.26
V HB16.18
(m-M)15.68
Vt8.27
MVt-7.41
(U-B)0.15
(B-V)0.86
(V-I)1.16
S_RR2.2
HBR0.98
hbt1
Structural Parameters
[Fe / H]-1.98
SpT F5
v_r-135.6
err0.9
v_LSR-119.1
c1.38
r_c0.44
r_h1.1
r_t8.56
lg(tc)8.33
lg(th)9.01
mu_V18.08
rho_v3.28
Color-magnitude diagrams
author Ivanov, Valentin D.; Borissova, Jordanka; Alonso-Herrero, Almudena; Russeva, Tatiana
titleExtending the Red Giant Branch versus Metallicity Calibration toward Metal-poor Systems:
Near-Infrared Photometry of the Galactic Globular Clusters M56 and M15
journalThe Astronomical Journal, Volume 119, Issue 5, pp. 2274-2281 (2000)
CM diagram
CreditsCMD from Padova database
Description of NGC 6779

Messier 56 (also known as M56 or NGC 6779) is a globular cluster in the constellation Lyra. It was discovered by Charles Messier in 1779. M56 is at a distance of about 32,900 light-years from Earth and measures roughly 84 light-years across.

The brightest stars in M56 are of 13th magnitude while it contains only about a dozen known variable stars like V6 (RV Tauri star; period: 90 days) or V1 (Cepheid: 1.510 days); other variable stars are V2 (irregular) and V3 (semiregular).

Source: Wikipedia | Notify inaccuracies

Image

Image of the cluster from the Digital Sky Survey

Other Resources
for NGC 6779
ADS "Object Search"
SEDS data
Web Links for this cluster
(2 links in the database at the moment)
Users comments for this cluster
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Selected biblio
Paper n. 1
Garner, David
On Another Wavelength: M56 - A Globular Cluster in Lyra
2011, Journal of the Royal Astronomical Society of Canada, Vol. 105, No. 5, p.209
(NGC 6779 )
Paper n. 2
Pietrukowicz, P. et al.
CURiuos Variables Experiment (CURVE): Variable Stars in the Metal-Poor Globular Cluster M56
2008, Acta Astronomica, vol. 58, pp. 121-130
(NGC 6779 )
Paper n. 3
Ivanov, Valentin D.; Borissova, Jordanka; Alonso-Herrero, Almudena; Russeva, Tatiana
Extending the Red Giant Branch versus Metallicity Calibration toward Metal-poor Systems:
Near-Infrared Photometry of the Galactic Globular Clusters M56 and M15

2000, The Astronomical Journal, Volume 119, Issue 5, pp. 2274-2281 (2000)
(NGC 6779 cmd )
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