2012MNRAS.419.1254R

Query : 2012MNRAS.419.1254R

2012MNRAS.419.1254R - Mon. Not. R. Astron. Soc., 419, 1254-1270 (2012/January-2)

Chemical composition of a sample of candidate post-asymptotic giant branch stars.

RAO S.S., GIRIDHAR S. and LAMBERT D.L.

Abstract (from CDS):

We have derived elemental abundances for a sample of nine IRAS sources with colours similar to those of post-asymptotic giant branch (post-AGB) stars. For IRAS 01259+6823, IRAS 05208-2035, IRAS 04535+3747 and IRAS 08187-1905, this is the first detailed abundance analysis based upon high-resolution spectra. Mild indication of s-processing for IRAS 01259+6823, IRAS 05208-2035 and IRAS 08187-1905 has been found and a more comprehensive study of s-process-enhanced objects IRAS 17279-1119 and IRAS 22223+4327 has been carried out.

We have also made a contemporary abundance analysis of the high Galactic latitude supergiants BD+39°4926 and HD 107369. The former is heavily depleted in refractories and estimated [Zn/H] of -0.7 dex most likely gives initial metallicity of the star. For HD 107369 the abundances of α and Fe-peak elements are similar to those of halo objects and moderate deficiency of s-process elements is seen. IRAS 07140-2321, despite being a short-period binary with a circumstellar shell, does not exhibit selective depletion of refractory elements.

We have compiled the stellar parameters and abundances for post-AGB stars with s-process enhancement, those showing significant depletion of condensable elements and those showing neither. The compilation shows that the s-process-enhanced group contains a very small number of binaries, and observed [α/Fe] are generally similar to thick-disc values. It is likely that they represent AGB evolution of single stars.

The compilation of the depleted group contains a larger fraction of binaries and generally supports the hypothesis of dusty discs surrounding binary post-AGB stars inferred via the shape of their spectral energy distribution and mid-infrared interferometry. IRAS 07140-2321 and BD+39°4926 are difficult to explain with this scenario and indicate the existence of an additional parameter/condition needed to explain the depletion phenomenon. However, the conditions for discernible depletion, minimum temperature of 5000 K and initial metallicity larger than -1.0 dex found from our earlier work still serve as useful criteria.


Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): stars: abundances - stars: AGB and post-AGB - stars: atmospheres - circumstellar matter - stars: evolution

Simbad objects: 99

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Number of rows : 99
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 IRAS 01259+6823 AB? 01 29 33.6927492733 +68 39 14.508700691     12.6     F5Ie 14 0
2 HD 10132 * 01 39 58.1459516400 +41 40 00.241063320   7.77 6.85     G5 13 0
3 HD 10285 * 01 42 24.1259998584 +63 25 44.689183752   9.23 8.58     A5 15 0
4 * gam01 And * 02 03 53.95229 +42 19 47.0223 4.22 3.30 2.10 1.16 0.47 K2+IIb 342 1
5 IRAS Z02229+6208 pA* 02 26 41.7882689568 +62 21 21.981286008   14.69 12.00 11.16 8.92 G8-K0_0-Ia: 61 0
6 HD 25291 * 04 04 27.1629402984 +59 09 19.832668272 6.10 5.63 5.12 4.62 4.24 F0II 108 0
7 V* TW Cam pA* 04 20 47.6363454312 +57 26 28.522779504 12.12 11.42 10.08 9.29   G8Ib 71 0
8 HD 27381 Em* 04 20 55.1377225848 +38 34 37.751313036 9.21 8.47 7.56     F2 24 0
9 IRAS 04296+3429 pA* 04 32 56.9743899192 +34 36 12.459816288   16.13 14.09 13.64 11.64 G0Ia 147 0
10 V* RV Tau RV* 04 47 06.7239850584 +26 10 45.532913268   11.00 9.80     K3Ibe 279 1
11 V* V409 Aur LP* 04 56 58.9563947760 +37 51 57.420957204   9.69 8.700     G0 14 0
12 IRAS 05113+1347 pA* 05 14 07.7664787608 +13 50 28.200887160   14.786 12.574 11.663 10.26 G5I 70 0
13 V* AY Lep pA* 05 22 59.4229189104 -20 32 53.048251464   10.52 9.48     ~ 32 0
14 IRAS 05341+0852 pA* 05 36 55.0511076432 +08 54 08.656315452   15.37 13.45 12.95 11.43 F5I 120 0
15 V* DY Ori pA* 06 06 14.9085939696 +13 54 19.118975940   12.956 11.503 11.030   ~ 50 1
16 V* SS Gem RV* 06 08 35.1092051400 +22 37 01.988942124 10.42 9.71 8.67     G2/5I 68 0
17 V* CT Ori RV* 06 09 57.9915157032 +09 52 31.839108384   11.24 9.14     F9 39 0
18 V* UY CMa RV* 06 18 16.3755429480 -17 02 34.676976156   11.55 10.80     G0V 42 0
19 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 765 0
20 V* V382 Aur pA* 06 37 52.4269199856 +53 31 01.958446992   9.585 9.295 9.078   F7IV: 133 0
21 V* SZ Mon pA* 06 51 27.8476503456 -01 22 15.965715072   10.996 10.259 9.910 9.109 F8(e) 69 1
22 IRAS 06530-0213 pA* 06 55 31.8205478808 -02 17 28.243142520   16.38 13.99 13.26   F5Ia 81 0
23 V* PS Gem pA* 07 03 39.6305052432 +10 46 13.068774048   7.76 7.37     A0 120 0
24 HD 53300 pA? 07 04 19.4780299008 -05 18 19.551600720 8.73 8.37 8.06     A2II 20 0
25 V* V421 CMa pA* 07 16 08.2750036896 -23 27 01.536458868   11.16 10.73     F5 31 0
26 HD 56126 pA* 07 16 10.2590823192 +09 59 47.954735376   9.20 8.32     F0/5Ia 320 0
27 V* U Mon RV* 07 30 47.4711645432 -09 46 36.757477488 8.22 7.00 5.82     G8/K0Ib/II 206 0
28 V* AI CMi pA* 07 35 41.1506935176 +00 14 57.993628992   9.83 8.31     G5Iab 60 0
29 IRAS 07430+1115 s*r 07 45 51.3968191368 +11 08 19.561606620   13.94 12.22 11.82 10.69 M2I 63 0
30 V* AR Pup pA* 08 03 01.6516600440 -36 35 47.949428976   10.25 9.55     Rpec 86 0
31 IRAS 08143-4406 pA* 08 16 03.0217187040 -44 16 04.640255580           F8I 31 0
32 HD 70379 pA* 08 20 57.1025596512 -19 15 03.411879264   9.63 9.02 9.463   G1I 31 0
33 V* CO Pup WV* 08 26 11.9557975008 -30 17 08.330493228   11.86 10.74     ~ 30 0
34 IRAS 08281-4850 pA* 08 29 40.5522281112 -49 00 04.329698184       13.50   F0I 21 0
35 CD-44 4961 pA* 08 56 14.1799968840 -44 43 10.721249580   10.55 9.176     F3e 73 1
36 V* BZ Pyx pA* 09 08 10.1394900720 -28 19 10.396543512   12.04 11.39     F6Ia 16 0
37 IRAS 09144-4933 pA* 09 16 09.6356114088 -49 46 12.098975844   16.016   12.865   M4/S? 21 0
38 V* IW Car pA* 09 26 53.3035361952 -63 37 48.931552488   9.07 7.90     F7/8 94 0
39 V* GP Cha RV* 09 53 57.6758478120 -76 36 52.265551536   12.49 11.52     G0 17 0
40 HD 89353 pA* 10 18 07.5899342712 -28 59 31.195183524   5.76 5.53     B9.5Ib/II 307 0
41 V* V802 Car pA* 11 02 04.3154924592 -62 09 42.834006396   9.57 8.90 9.38   F2III 54 0
42 HD 105262 pA* 12 07 10.8254657184 +12 59 07.679272308 6.96 7.08 7.08     B9 70 0
43 V* RU Cen pA* 12 09 23.8148403768 -45 25 34.801333356   9.81 8.70     G1Ie 96 1
44 CD-53 4543 pA* 12 20 15.0622728552 -53 55 31.444773420 10.29 9.74 9.36 9.69   A7I 46 0
45 HD 107369 pA* 12 20 44.9452565208 -32 33 26.107102908   9.78 9.60     A3IIp 42 0
46 V* SX Cen RV* 12 21 12.5736554208 -49 12 41.058679536   10.11 9.60     B5III 68 0
47 HD 108015 pA* 12 24 53.5035641784 -47 09 07.499485656   8.379 7.96     F3/5Ib/II 61 0
48 V* LN Hya pA* 12 56 30.1302499344 -26 27 37.047715704   9.104 8.697   9.291 F3Ia 120 0
49 V* V956 Cen pA* 13 14 08.2677843336 -54 41 34.639005336 9.83 9.66 9.23 8.96   F5Ia/ab 44 0
50 V* W Vir WV* 13 26 01.9928807928 -03 22 43.431062880   10.33 9.46 9.29 9.393 F2Ibe 300 0
51 IRAS 14325-6428 pA* 14 36 34.3740180048 -64 41 31.082196876   12.56 12.00     F5I 26 0
52 V* EN TrA pA* 14 57 00.6850828200 -68 50 22.897081716   9.42 8.70     F2Ib 73 0
53 V* BT Lib RV* 15 31 15.8760288360 -23 21 36.218358324   11.872 11.259   10.486 ~ 18 0
54 V* RX Lib WV* 15 42 00.0540790608 -20 46 45.904718964     11.60     F9 26 0
55 IRAS 15469-5311 pA* 15 50 43.8050062584 -53 20 43.252965456   11.963 10.504 10.212   F3 27 0
56 V* V1333 Sco pA* 16 26 20.3836477344 -34 17 12.911443404   12.38 11.41     F8 21 0
57 V* TT Oph RV* 16 49 35.8841138088 +03 37 54.167585592 11.64 10.57 9.45     F5pe 69 0
58 V* TX Oph pA* 17 04 00.0881346720 +04 59 00.824168220   11.17 9.70     F8Iae 33 0
59 CD-48 11445 pA* 17 07 36.6587101920 -48 19 08.477155920   12.33 10.55     G2p(R) 31 0
60 HD 159251 * 17 10 20.7906630696 +84 35 55.608848088   8.26 7.23     G5 15 0
61 V* UZ Oph RV* 17 21 59.2604312616 +06 54 42.224407308 11.60 10.88 9.93     F8Iae 33 0
62 V* V453 Oph RV* 17 26 49.1293769256 -02 23 36.431892240   11.7 10.85     A5 59 0
63 IRAS 17233-4330 WV* 17 26 58.6372808208 -43 33 13.574510568   11.99 11.56   11.142 A2Iab 21 0
64 V* LR Sco RV* 17 27 53.6271514344 -43 50 46.291360596   11.45 10.37     G0I 34 0
65 V* UY Ara pA* 17 29 28.9495380096 -59 54 02.183763204   11.86 10.98 10.97   ~ 25 1
66 V* V340 Ser RV* 17 30 46.9248358536 -11 22 08.313569004   10.51 9.68     F2/3II 36 0
67 V* AI Sco RV* 17 56 18.5781588120 -33 48 43.278508116   10.99 9.98     G5 47 0
68 V* AZ Sgr RV* 18 24 11.1427347360 -30 35 48.258522384   11.68 11.00 10.83   G0V 10 0
69 V* AC Her RV* 18 30 16.2373118976 +21 52 00.599340000 8.00 7.79 7.01     F4Ibp 340 0
70 V* CC Lyr WV* 18 33 57.4123406832 +31 38 24.187157196   12.98 12.46     hF4mA:CH+1 51 0
71 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2687 1
72 HD 172481 pA* 18 41 36.9595215744 -27 57 01.235714652   9.58 9.06     F2/3Ia 49 0
73 HD 173638 * 18 46 43.3242113592 -10 07 30.161333784 6.7 6.285 5.717     F0IV 68 0
74 V* R Sct cC* 18 47 28.9498974024 -05 42 18.542611800 8.30 6.67 5.20 4.14 3.37 K4/5pec 319 0
75 V* BZ Sct cC* 18 57 33.4182497280 -05 47 55.707360000   13.69 12.40 12.06 11.027 ~ 13 0
76 V* AD Aql RV* 18 59 08.6994133296 -08 10 14.041081272   12.00 11.62 11.129   kF1hF5cnG5Ib 34 1
77 V* AR Sgr RV* 18 59 42.1480877976 -23 42 26.571919320   10.43 9.61     G4 26 0
78 BD+03 3950 RV* 19 15 01.1800830552 +03 48 42.641057988   11.16 10.37     F8 39 0
79 V* EP Lyr RV* 19 18 19.5570243336 +27 51 03.082292928   11.22 9.96 10.14   G2II 87 1
80 BD-02 4931 pA* 19 18 22.7165647344 -02 42 10.880466588   11.55 10.78     B1III 35 0
81 V* HP Lyr pA* 19 21 39.0673459320 +39 56 08.202817716   11.12 10.38 10.15 9.615 A3Ia/Iab 59 1
82 V* DY Aql RV* 19 46 30.5271229056 -10 56 54.867458328   11.49 10.20     G5 26 1
83 V* DF Cyg RV* 19 48 53.9450982768 +43 02 14.539346592   12.19 10.80 10.81 10.484 G6/7Ib/IIa 46 0
84 HD 187885 pA* 19 52 52.7033593752 -17 01 50.289441096   9.25 8.68 8.32   F2/6Ia 179 0
85 V* V1711 Sgr RV* 20 01 07.9860343992 -30 30 38.905165224   11.31 10.62 10.51   F6CH+2 47 0
86 V* QY Sge LP* 20 07 54.6224115384 +18 42 54.538913232   12.57       G0Ie 55 0
87 V* R Sge RV* 20 14 03.7432133928 +16 43 35.030552844   10.17 9.20     G8Ib 81 0
88 V* TW Cap RV* 20 14 28.4158961112 -13 50 07.884309192   11.660 10.862 10.292   F4Ib 75 0
89 V* RX Cap RV* 20 14 55.2133545384 -12 56 34.610205084   11.80 11.18 11.43   G0Iae 25 1
90 V* V Vul RV* 20 36 32.0211817128 +26 36 14.499788940   9.68 8.05     K0 81 0
91 V* V360 Cyg RV* 21 10 35.4880523232 +30 40 20.693468748   11.81 11.09     F8Ie 38 0
92 V* MZ Cyg WV* 21 21 54.7238681664 +37 27 33.101250912   13.16 12.14     G1 44 0
93 V* V448 Lac pA* 22 24 31.4283564864 +43 43 10.978781916 11.22 10.61 9.69     F7I 111 0
94 HD 235858 pA* 22 29 10.3748806056 +54 51 06.344572284   11.40 9.52 8.47 7.34 G5Ia 254 0
95 V* HM Aqr pA* 22 35 27.5260668720 -17 15 26.894587392 9.31 9.08 8.90     A0III 111 0
96 BD+39 4926 pA* 22 46 11.2272974832 +40 06 26.309865960   9.621 9.357 9.374   A0IIp 126 0
97 V* DS Aqr RV* 22 53 17.0396657784 -18 35 30.976363752 11.88 11.62 11.08     F2II 38 0
98 * 2 Cas * 23 09 44.1389006784 +59 19 57.687059136 6.33 5.977 5.679     A4II 49 0
99 IRAS 23304+6147 pA* 23 32 44.7858431592 +62 03 49.090372272   15.36 12.99 12.23 10.50 G2Ia 117 0

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