2013A&A...559A.120O


Query : 2013A&A...559A.120O

2013A&A...559A.120O - Astronomy and Astrophysics, volume 559A, 120-120 (2013/11-1)

VLA survey of 22 GHz H2O masers toward ten silicate carbon stars.

OHNAKA K., BOBOLTZ D.A., MULITZ-SCHIMEL G., IZUMIURA H. and WITTKOWSKI M.

Abstract (from CDS):

Despite their carbon-rich photospheres, silicate carbon stars show evidence of oxygen-rich circumstellar material, which is thought to exist in disks. Silicate carbon stars represent interesting cases that allow us to study the possible effects of binarity on stellar evolution and mass loss accompanied by the formation of disks. We present a small survey of 22GHz H2O masers toward ten silicate carbon stars with much better sensitivity than is the case for previous observations. We observed our sample with the Karl G. Jansky Very Large Array (VLA) using the most expanded configuration (A-configuration) with a maximum baseline of 36km. For some of our program stars with noisy Infrared Astronomical Satellite (IRAS) Low Resolution Spectra (LRS), we present new mid-IR spectra obtained with the Very Large Telescope Interferometer and the Spitzer Space Telescope. We detected H2O masers toward five out of ten silicate carbon stars (EU And, V778 Cyg, IRAS06017+1011, V1415 Cyg, and NC83 = V1945 Cyg), with NC83 being a new detection. No H2O masers were detected toward BM Gem, IRAS07221-0431, IRAS08002-3803, IRAS18006-3213, and HD189605. The velocity separation between the most blue- and red-shifted maser features is 10-14km/s. If we assume that the masers originate in circum-companion disks, the measured velocity separations translate into a lower limit of the rotational velocity of 5-7km/s, and the upper limit of the radius of the maser emitting region is estimated to be 10-68 AU for a companion mass of 0.5-1.7M. The new mid-IR spectra of NC83, IRAS06017+1011, and HD189605 confirm the 10µm silicate emission. The latter two stars show a bump at ∼11.5µm, which is presumably due to SiC originating in the ongoing mass loss from the carbon-rich primary star, not due to crystalline silicate. We also report on the detection of the UV flux at 2271Å toward HD189605.

Abstract Copyright:

Journal keyword(s): radio lines: stars - techniques: interferometric - circumstellar matter - stars: carbon - stars: chemically peculiar - stars: AGB and post-AGB

CDS comments: Paragraph. 2 MC79-11 is probably MC79 2-11 and not MC79 1-11.

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2733 2
2 * 56 Ori V* 05 52 26.4385770120 +01 51 18.496311408   6.130 4.750     K2-IIb 113 0
3 LEE 34 C* 06 04 31.3912607928 +10 10 57.209863584   14.52 11.21 10.38   C4,5J 24 0
4 V* BM Gem C* 07 20 59.0073521904 +24 59 58.086063708     11.50     C-J5- 145 1
5 Case 425 C* 07 22 46.9832790072 -10 38 39.362691948       12.00   C4,5J 20 0
6 C* 749 C* 07 24 39.1245832224 -04 37 54.172440624     13.5     C-J5 20 0
7 CD-37 4167 C* 08 02 04.9975175328 -38 11 52.160871228   14.1 10.3     C-J4 48 0
8 MC79 2-11 C* 08 58 54.2313605640 -60 47 36.088218924     11.4 11.22 9.33 C-J6 25 0
9 V* SS Vir C* 12 25 14.3948245008 +00 46 10.946740368 15.84 10.79 6.60     C-N4.5: 202 1
10 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4190 2
11 Case 161 C* 18 00 44.9869039512 -17 00 34.768752300   15.74 12.29 11.43   C5,5J 17 0
12 IRAS 18006-3213 OH* 18 03 52.8259593264 -32 12 59.377416948       12.24 9.71 O-rich 35 0
13 V* AC Her RV* 18 30 16.2373118976 +21 52 00.599340000 8.00 7.79 7.01     F4Ibp 329 0
14 C* 3302 C* 19 15 01.5583913328 +54 17 29.209493580   16.3 11.8     C 31 0
15 GALEX J200105.1-072151 UV 20 01 05.1 -07 21 51           ~ 1 0
16 HD 189605 C* 20 01 05.1826294416 -07 21 51.922979532   12.51 10.21     C5,5 41 0
17 MSB 38 C* 20 36 07.3864144104 +60 05 26.039264496   13.98 9.86 10.3   C-J4+ 119 0
18 Case 244 C* 22 01 17.4243556752 +54 32 33.327417732           C 19 0
19 V* EU And C* 23 19 58.8818386848 +47 14 34.575341784   12.84 10.38     C-J5- 88 0

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2023.03.29-01:57:25

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