2012ApJ...754L..34M

Query : 2012ApJ...754L..34M

2012ApJ...754L..34M - Astrophys. J., 754, L34 (2012/August-1)

The infrared eye of the wide-field camera 3 on the Hubble space telescope reveals multiple main sequences of very low mass stars in NGC 2808.

MILONE A.P., MARINO A.F., CASSISI S., PIOTTO G., BEDIN L.R., ANDERSON J., ALLARD F., APARICIO A., BELLINI A., BUONANNO R., MONELLI M. and PIETRINFERNI A.

Abstract (from CDS):

We use images taken with the infrared channel of the Wide Field Camera 3 on the Hubble Space Telescope to study the multiple main sequences (MSs) of NGC 2808. Below the turnoff, the red, the middle, and the blue MS, previously detected from visual-band photometry, are visible over an interval of about 3.5 F160W magnitudes. The three MSs merge together at the level of the MS bend. At fainter magnitudes, the MS again splits into two components containing ∼65% and ∼35% of stars, with the most-populated MS being the bluest one. Theoretical isochrones suggest that the latter is connected to the red MS discovered in the optical color-magnitude diagram (CMD) and hence corresponds to the first stellar generation, having primordial helium and enhanced carbon and oxygen abundances. The less-populated MS in the faint part of the near-IR CMD is helium-rich and poor in carbon and oxygen, and it can be associated with the middle and the blue MS of the optical CMD. The finding that the photometric signature of abundance anti-correlation is also present in fully convective MS stars reinforces the inference that they have a primordial origin.

Abstract Copyright: ∼

Journal keyword(s): globular clusters: individual: NGC 2808 - Hertzsprung-Russell and C-M diagrams

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 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0

Query : 2012ApJ...754L..34M

Basic data :
NGC 2808 -- Globular Cluster
Other object types: otypes_help 		* (CPD,GCRV,...), GlC (2013A&A,GCl), Cl* (C,[KPS2012]), IR (IRAS)
ICRS coord. (ep=J2000) : 		09 12 03.10 -64 51 48.6 (Optical) [ ] D 2010AJ....140.1830G
FK4 coord. (ep=B1950 eq=1950) : 		09 11 04.42 -64 39 24.9 [ ]
Gal coord. (ep=J2000) : 		282.19303 -11.25259 [ ]
Proper motions mas/yr : 		1.02 0.28 [0.01 0.01 90] C 2019MNRAS.482.5138B
Radial velocity / Redshift / cz : 		V(km/s) 103.7 [0.3] / z(spectroscopic) 0.000346 [0.000001] / cz 103.72 [0.30]
   (Opt) A 2018MNRAS.478.1520B
Parallaxes (mas): 		0.112 [0.010] C 2021MNRAS.505.5978V
Angular size (arcmin): 		13.8 13.8 90 (Opt) D 1989Sci...246.1066D
Fluxes (1) :
K 3.06 [~] D 2008MNRAS.389.1924F
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1
: 1320 		: 186 Display criteria :

Identifiers (11) :
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NGC 2808 CPD-64 1012 HD 79627 IRAS F09110-6439
AKARI-IRC-V1 J0912036-645148 GCl 13 HR 3671 [KPS2012] MWSC 1636
C 0911-646 GCRV 3437 E IRAS 09110-6439

References (1540 between 1850 and 2026) (Total 1540)
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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Collections of Measurements Description of Measurements

Velocities : 5    Distance : 3    Fe/H : 17    Plx : 2    PM : 3   

   

Observing logs
IUE : 2    XMM : 1   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : NGC 2808

Link by name to the catalogue in VizieR :

NGC 2808 AKARI-IRC-V1 J0912036-645148 CPD-64 1012 HD 79627 HR 3671
IRAS 09110-6439 IRAS F09110-6439

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