2002A&A...387..624K


Query : 2002A&A...387..624K

2002A&A...387..624K - Astronomy and Astrophysics, volume 387, 624-634 (2002/5-4)

VLT/UVES and WHT/UES absorption spectroscopy of the circumstellar envelope of IRC + 10° 216 using background stars. First results and a search for DIBs.

KENDALL T.R., MAURON N., McCOMBIE J. and SARRE P.J.

Abstract (from CDS):

A unique and novel set of observations has been undertaken to probe the circumstellar envelope (CSE) of the nearby (130pc) carbon star IRC +10° 216 using optical absorption spectroscopy towards background stars lying beyond the envelope. The primary aim of the observations is to search for diffuse band (DIB) carriers in the CSE, for which the mass-losing envelopes of carbon stars are a likely place of origin. Our principal target is a V=16 G-type star located 37'' from IRC +10° 216 and was observed with VLT/UVES. A detailed model atmosphere and abundance analysis shows that it is somewhat metal-poor and has confirmed that it lies far beyond IRC +10° 216. The circumstellar H+2H2 column density expected along the line of sight towards this target is relatively high, ∼2x1021cm–2, and is large compared to that derived from the small interstellar extinction estimated in the zone of IRC +10° 216 at b=+43°, EB–V<0.03mag. The CSE is certainly detected in the K I resonance lines, which are centred at the heliocentric velocity of IRC +10° 216 and have FWHM∼30km/s, consistent with twice the terminal expansion velocity of the circumstellar gas. The data show also that circumstellar Na i is very probably detected, as seen towards two background stars. The strongest DIB (6284Å) present in the UVES wavelength coverage is detected but very probably arises in the foreground ISM. No DIB is detected at 6614 Å, or elsewhere. Overall, the data suggest that the DIB carriers, if present in the CSE, have a low abundance relative to H in the C-rich envelope of IRC +10° 216, in comparison with this ratio in the ISM.

Abstract Copyright:

Journal keyword(s): stars: individual: IRC +10 216 - stars: carbon - stars: circumstellar matter - ISM: lines and bands - ISM: molecules

Simbad objects: 24

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Number of rows : 24
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 IRAS 04296+3429 pA* 04 32 56.9743899192 +34 36 12.459816288   16.13 14.09 13.64 11.64 G0Ia 139 0
2 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 735 0
3 BM IV 10 C* 07 29 12.5855662656 -19 27 48.659126364   13.44 12.13 10.41 9.44 C 50 0
4 2MASS J09475565+1314126 * 09 47 55.6540503048 +13 14 12.599230992     12.4     F8: 2 0
5 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2240 0
6 [MDL2003] 6 * 09 47 57.9880197768 +13 16 09.534429912   16.78 16.00     G2: 3 0
7 * nu. Leo SB* 09 58 13.3755707 +12 26 41.286492 5.01 5.212 5.260     B6IV 77 0
8 HD 89353 pA* 10 18 07.5899342712 -28 59 31.195183524   5.76 5.53     B9.5Ib/II 296 0
9 Wolf 1492 Pe* 13 40 02.4921849768 -00 02 18.750053436 11.601 11.832 11.451 11.184 10.892 sdF0: 272 0
10 V* V854 Cen RC* 14 34 49.4024471640 -39 33 19.201288284   7.13 11.69     Ce 203 0
11 WRAY 15-1269 PN 14 59 53.4819371136 -54 18 07.521138792 12.12 12.17 11.64 11.63   [WC11] 236 0
12 CPD-56 8032 PN 17 09 00.9291677740 -56 54 47.868280757 11.24 11.48 11.04 11.067   [WC10] 256 0
13 V* AC Her pA* 18 30 16.2373118976 +21 52 00.599340000 8.00 7.79 7.01     F4Ibp 325 0
14 HD 178921 * 19 10 44.1771771408 -06 11 35.845875168   10.63 10.10     A3/5(V)+A0/1 4 0
15 HD 183143 s*b 19 27 26.5636061496 +18 17 45.193019136 8.25 8.08 6.86 5.74 4.79 B6Ia 422 0
16 HD 184738 PN 19 34 45.2337620448 +30 30 58.950651240   10.41 10.44     [WC9] 932 0
17 Schulte 9 s*b 20 33 10.7362926720 +41 15 08.222370372 13.38 12.77 10.96     O4.5If 215 0
18 V* V1610 Cyg pA* 21 02 18.27 +36 41 37.0           F5Iae 853 1
19 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2402 1
20 [D75b] Em* 21-021 PN 21 29 58.4711786760 +51 04 00.323924520   15.66 14.20 13.89   O7(f)/[WC11] 235 0
21 V* V448 Lac pA* 22 24 31.4283564864 +43 43 10.978781916 11.22 10.61 9.69     F7I 103 0
22 HD 235858 pA* 22 29 10.3748806056 +54 51 06.344572284   11.40 9.52 8.47 7.34 G5Ia 244 0
23 V* HM Aqr pA* 22 35 27.5260668720 -17 15 26.894587392 9.31 9.08 8.90     A0III 103 0
24 IRAS 23304+6147 pA* 23 32 44.7858431592 +62 03 49.090372272   15.36 12.99 12.23 10.50 G2Ia 110 0

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2022.05.25-22:03:04

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