2011A&A...531L..12A


Query : 2011A&A...531L..12A

2011A&A...531L..12A - Astronomy and Astrophysics, volume 531, L12-12 (2011/7-1)

IRAS 12556-7731: a ``chamaeleonic'' lithium-rich M-giant.

ALCALA J.M., BIAZZO K., COVINO E., FRASCA A. and BEDIN L.R.

Abstract (from CDS):

In this letter we characterise IRAS12556-7731 as the first lithium-rich M-type giant. Based on its late spectral type and high lithium content, and because of its proximity in angular distance to the ChamaeleonII star-forming region, the star was misclassified as a young low-mass star in a previous work. Based on HARPS data, synthetic spectral modelling, and proper motions, we derive the astrophysical parameters and kinematics of the star and discuss its evolutionary status. This solar-mass red giant (Teff=3460±60K and logg=0.6±0.2) is characterised by a relatively fast rotation (vsini∼8km/s), slightly subsolar metallicity and a high-lithium abundance, A(Li)=2.4±0.2dex. We discuss IRAS12556-7731 within the context of other known lithium-rich K-type giants. Because it is close to the tip of the red giant branch, IRAS12556-7731 is the coolest lithium-rich giant known so far, and it is among the least massive and most luminous giants where enhancement of lithium has been detected. Among several possible explanations, we cannot preclude the possibility that the lithium enhancement and rapid rotation of the star were triggered by the engulfment of a brown dwarf or a planet.

Abstract Copyright:

Journal keyword(s): stars: low-mass - stars: fundamental parameters - stars: individual: IRAS12556-7731 - stars: abundances - stars: late-type

Simbad objects: 8

goto Full paper

goto View the references in ADS

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 - 2023
#notes
1 NAME Gal Anticenter reg 05 46 +28.9           ~ 838 0
2 HD 39853 RG* 05 54 43.6305696648 -11 46 27.098071500   7.148 5.613     K4III 111 0
3 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 760 0
4 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1131 0
5 NAME Cha II MoC 12 54 -77.2           ~ 321 0
6 IRAS 12556-7731 LP* 12 59 26.3852196576 -77 47 08.619604404   15.039 13.136 12.748   M5 22 0
7 HD 173740 PM* 18 42 46.8946714770 +59 37 36.721161413   11.705   8.9   M3.5V 320 1
8 * 13 Lyr LP* 18 55 20.1022285 +43 56 45.931489 7.00 5.59 4.00 1.95 0.04 M4.5III 308 1

To bookmark this query, right click on this link: simbad:objects in 2011A&A...531L..12A and select 'bookmark this link' or equivalent in the popup menu


2023.01.27-13:06:46

© Université de Strasbourg/CNRS

    • Contact