2020A&A...641A.142S


Query : 2020A&A...641A.142S

2020A&A...641A.142S - Astronomy and Astrophysics, volume 641A, 142-142 (2020/9-1)

Validating post-AGB candidates in the LMC and SMC using SALT spectra.

SZCZERBA R., HAJDUK M., PAVLENKO Y.V., HRIVNAK B.J., KAMINSKY B.M., VOLK K., SIODMIAK N., GEZER I., ZACS L., PYCH W. and SARNA M.

Abstract (from CDS):

We selected a sample of post-AGB candidates in the Magellanic Clouds on the basis of their near- and mid-infrared colour characteristics. Fifteen of the most optically bright post-AGB candidates were observed with the South African Large Telescope in order to determine their stellar parameters and thus to validate or discriminate their nature as post-AGB objects in the Magellanic Clouds. The spectral types of absorption-line objects were estimated according to the MK classification, and effective temperatures were obtained by means of stellar atmosphere modelling. Emission-line objects were classified on the basis of the fluxes of the emission lines and the presence of the continuum. Out of 15 observed objects, only 4 appear to be genuine post-AGB stars (27%). In the SMC, 1 out of 4 is post-AGB, and in the LMC, 3 out 11 are post-AGB objects. Thus, we can conclude that the selected region in the colour-colour diagram, while selecting the genuine post-AGB objects, overlaps severely with other types of objects, in particular young stellar objects and planetary nebulae. Additional classification criteria are required to distinguish between post-AGB stars and other types of objects. In particular, photometry at far-IR wavelengths would greatly assist in distinguishing young stellar objects from evolved ones. On the other hand, we showed that the low-resolution optical spectra appear to be sufficient to determine whether the candidates are post-AGB objects.

Abstract Copyright: © ESO 2020

Journal keyword(s): stars: AGB and post-AGB - stars: abundances - stars: atmospheres - stars: emission-line, Be

VizieR on-line data: <Available at CDS (J/A+A/641/A142): table1.dat fig2.dat fig3.dat fig4.dat>

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 [M2002] SMC 9251 Y*O 00 47 47.5178715072 -73 17 27.913204068   14.90 14.76 15.76   O7 4 0
2 LHA 115-N 31 Y*O 00 48 41.869 -73 26 15.17   14.92 15.1 15.27 15.60 B0 27 0
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10264 1
4 RMC 26 s*y 01 02 43.0422251616 -72 07 25.970159964 12.19 11.94 11.64     F0Ia 36 0
5 [BSS2007] 255 pA* 01 05 46.4557129824 -71 47 05.274363984           B8Iab 9 0
6 LHA 115-N 86 Ae* 01 15 42.86208 -73 09 59.2776 16.30 17.14 16.03   15.33 ~ 11 0
7 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6325 1
8 AL 40 Ae? 04 57 47.9495855136 -66 28 45.008028372 14.226 15.386 14.817 14.93 13.673 ~ 7 0
9 LHA 120-S 10 Em* 04 59 07.3888263720 -65 43 13.326456000   13.12 13.28 13.60   O9ep/B1-2ep 10 0
10 IRAS 05110-6616 pA* 05 11 10.6392128544 -66 12 53.624892600 20.528 18.416 16.629 15.70 14.536 F0Ib 18 0
11 IRAS 05127-6911 Y*O 05 12 28.2173503377 -69 07 55.759681244 15.598 16.586 16.154 16.090 16.129 ~ 13 1
12 IRAS S05211-6926 pA* 05 20 43.8870629914 -69 23 41.139112840 17.618 16.515 15.075 13.92 13.887 F5Ib(e) 20 0
13 IRAS 05232-7111 G 05 22 29.1854681976 -71 08 14.932066452   16.088 15.307 16.161 15.162 ~ 3 0
14 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16073 1
15 IRAS Z05259-7052 pA* 05 25 20.7706707096 -70 50 07.476379728 17.562 16.570 15.335 14.480 16.252 A2Ib 13 0
16 LHA 120-N 53 PN 05 29 15.6693091824 -67 32 47.610463128 15.945 17.093 18.76 16.01 17.264 ~ 42 0
17 SV* HV 2671 RC* 05 33 48.9473907384 -70 13 23.504301372     15.758   15.391 ~ 29 1
18 AL 391 Em* 05 40 55.8443468472 -69 16 14.571389748   14.544 14.36 14.62   B0.5III[e] 9 0
19 IRAS 05588-6944 RC* 05 58 25.9823069328 -69 44 25.826364204           ~ 17 0
20 V* V348 Sgr pA* 18 40 19.9290428808 -22 54 29.308207716   12.1       B0/1?I?e 179 0

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2022.07.05-15:20:00

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