2017MNRAS.464.3021M

Query : 2017MNRAS.464.3021M

2017MNRAS.464.3021M - Mon. Not. R. Astron. Soc., 464, 3021-3028 (2017/January-3)

Nitrogen depletion in field red giants: mixing during the He flash?

MASSERON T., LAGARDE N., MIGLIO A., ELSWORTH Y. and GILMORE G.

Abstract (from CDS):

We combine simultaneous constraints on stellar evolutionary status from asteroseismology, and on nitrogen abundances derived from large spectroscopic surveys, to follow nitrogen surface abundances all along the evolution of a low-mass star, comparing model expectations with data. After testing and calibrating the observed yields from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey, we first show that nitrogen surface abundances follow the expected trend after the first dredge-up occurred, i.e. that the more massive is the star, the more nitrogen is enhanced. Moreover, the behaviour of nitrogen data along the evolution confirms the existence of non-canonical extramixing on the red giant branch (RGB) for all low-mass stars in the field. But more surprisingly, the data indicate that nitrogen has been depleted between the RGB tip and the red clump. This may suggest that some nitrogen has been burnt near or at the He flash episode.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: abundances - stars: evolution - Galaxy: abundances - Galaxy: abundances

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 6819 OpC 19 41 18.3 +40 11 19   8.21 7.3     ~ 719 0

Query : 2017MNRAS.464.3021M

Basic data :
NGC 6819 -- Open Cluster
Other object types: otypes_help 		OpC (2013A&A), Cl* (2020A&A,C,...), Cl? ([LP2019])
ICRS coord. (ep=J2000) : 		19 41 18.3 +40 11 19 (Optical) [ ] E 2023A&A...674A..37G
FK4 coord. (ep=B1950 eq=1950) : 		19 39 35.5 +40 04 14 [ ]
Gal coord. (ep=J2000) : 		073.9800 +08.4809 [ ]
Proper motions mas/yr : 		-2.916 -3.856 [0.004 0.004 90] C 2020A&A...633A..99C
Radial velocity / Redshift / cz : 		V(km/s) 2.80 [0.14] / z(spectroscopic) 0.000009 [0.000000] / cz 2.80 [0.14]
   (Opt) A 2021A&A...647A..19T
Parallaxes (mas): 		0.356 [0.001] C 2020A&A...633A..99C
Angular size (arcmin): 		11.4 11.4 0 (Opt) D 2020A&A...633A..99C
Fluxes (2) :
B 8.21 [~] E ~
V 7.3 [~] E ~
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Hierarchy : number of linked objects
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: 3895 		Display criteria :

Identifiers (6) :
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NGC 6819 Cl Melotte 223 [KPS2012] MWSC 3155
C 1939+400 NAME Foxhead Cluster [LP2019] 628

References (719 between 1850 and 2026) (Total 719)
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 : 11    Distance : 5    Fe/H : 16    Plx : 8    PM : 12   

   

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Data at NED - NASA/IPAC Extragalactic Database : NGC 6819

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NGC 6819

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