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


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.19CEST18:09:04

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 - 2020
#notes
1 IRAS 04296+3429 pA* 04 32 56.9768181234 +34 36 12.505781495   16.13 14.09 13.64 11.64 G0Ia 137 0
2 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 720 0
3 BM IV 10 C* 07 29 12.5853048852 -19 27 48.652896159   13.44 12.13 10.41 9.44 C 49 0
4 2MASS J09475565+1314126 * 09 47 55.6513446361 +13 14 12.594026159     12.4     F8: 2 0
5 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2153 0
6 [MDL2003] 6 * 09 47 57.9881201397 +13 16 09.534632296   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 74 0
8 HD 89353 pA* 10 18 07.5892879413 -28 59 31.194541133   5.76 5.53     B9.5Ib/II 287 0
9 Wolf 1492 Pe* 13 40 02.4921790616 -00 02 18.750321114 11.601 11.832 11.451 11.184 10.892 sdF0: 262 0
10 V* V854 Cen RC* 14 34 49.4088471574 -39 33 19.276531885   7.13       Ce 199 0
11 WRAY 15-1269 PN 14 59 53.4814028450 -54 18 07.524725528 12.12 12.17 11.64 11.63   [WC11] 228 0
12 CPD-56 8032 PN 17 09 00.86008 -56 54 48.0957 11.24 11.48 11.04     [WC10] 249 0
13 V* AC Her pA* 18 30 16.2374666779 +21 52 00.618442618 8.00 7.79 7.01     F4Ibp 316 0
14 HD 178921 * 19 10 44.1745865790 -06 11 35.857572963   10.63 10.10     A3/5(V)+A0/1 3 0
15 HD 183143 s*b 19 27 26.5636908636 +18 17 45.191198361 8.25 8.08 6.86 5.74 4.79 B6Ia 412 0
16 HD 184738 PN 19 34 45.2337512278 +30 30 58.951476338   10.41 10.44     [WC9] 920 0
17 Schulte 9 s*b 20 33 10.7366753544 +41 15 08.222187463 13.38 12.77 10.96     O4.5If 207 0
18 V* V1610 Cyg pA* 21 02 18.27 +36 41 37.0           F5Iae 833 1
19 NGC 7027 PN 21 07 01.8 +42 14 10   9.1 10.9     ~ 2333 1
20 [D75b] Em* 21-021 PN 21 29 58.4712776885 +51 04 00.323547316   15.66 14.20 13.89   O7(f)/[WC11] 227 0
21 V* V448 Lac pA* 22 24 31.4284207830 +43 43 10.975183855 11.22 10.61 9.69     F7I 101 0
22 HD 235858 pA* 22 29 10.3755939027 +54 51 06.341145584   11.40 9.52 8.47 7.34 G5Ia 238 0
23 V* HM Aqr pA* 22 35 27.5256072315 -17 15 26.885199823 9.31 9.08 8.90     A0III 100 0
24 IRAS 23304+6147 pA* 23 32 44.7854376478 +62 03 49.083515796   15.36 12.99 12.23 10.50 G2Ia 109 0

    Equat.    Gal    SGal    Ecl

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2020.10.19-18:09:04

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