2007A&A...463L...1R


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.27CET11:16:21

2007A&A...463L...1R - Astronomy and Astrophysics, volume 463, L1-4 (2007/2-4)

First detection of photospheric depletion in the Large Magellanic Cloud.

REYNIERS M. and VAN WINCKEL H.

Abstract (from CDS):

Recent photospheric abundance studies of galactic field RV Tauri stars show that depletion of refractory elements is rather common in these evolved objects. The process that creates this chemical anomaly is not understood well, but it probably requires the presence of gravitationally bound dust in a binary system. We test for the presence of depletion in extra-galactic objects. A detailed photospheric abundance study on the basis of high-quality UVES spectra was performed on the RV Tauri star in the LMC: MACHO82.8405.15. Abundances were derived using a critically compiled line list with accurate log(gf) values and the latest Kurucz model atmospheres. With [Fe/H]=-2.6 in combination with [Zn/Fe]=+2.3 and [S/Ti]=+2.5, MACHO82.8405.15 displays a strong depletion abundance pattern. The effect of the depletion is comparable to the strongest depletions seen in field Galactic RVTauri stars. The chemical analysis of MACHO82.8405.15 proves that the depletion process also occurs in the extragalactic members of the RV Tauri pulsation class. Our program star is a member of a larger sample of LMC RV Tauri objects. This sample is unique, since the distances of the members are well-constrained. Further studies of this sample are therefore expected to gain deeper insight into the poorly understood depletion phenomenon and of the evolutionary status of RVTauri stars in general.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: abundances - stars: individual: MACHO82.8405.15 - Magellanic Clouds

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 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5829 1
2 V* RV Tau Mi* 04 47 06.7238218181 +26 10 45.530144720   11.00 9.80     K0 266 0
3 OGLE LMC-T2CEP-15 RV* 04 55 43.2642447535 -67 51 09.787236567 17.31 16.23 14.93 14.28 14.061 G2-8(R)Ibe: 26 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15128 1
5 OGLE LMC-T2CEP-147 RV* 05 31 50.9980983316 -69 11 46.357793059 14.745 14.781 14.299 14.03 13.862 F4-G1Ibpe 20 0
6 HD 56126 pA* 07 16 10.2589670319 +09 59 47.953674864   9.20 8.32     F0/5Ia 305 0
7 V* V453 Oph RV* 17 26 49.1294964352 -02 23 36.433030709   11.7 10.85     A5 55 0
8 V* AC Her pA* 18 30 16.2374666779 +21 52 00.618442618 8.00 7.79 7.01     F4Ibp 318 0

    Equat.    Gal    SGal    Ecl

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