2013A&A...549A..68G


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.27CET12:16:55

2013A&A...549A..68G - Astronomy and Astrophysics, volume 549A, 68-68 (2013/1-1)

Polarimetric studies of carbon stars at high Galactic latitude.

GOSWAMI A. and KARINKUZHI D.

Abstract (from CDS):

Very little is known about the polarimetric properties of CH stars and carbon-enhanced metal-poor (CEMP) stars, although many of these objects have been studied in detail both photometrically and spectroscopically. We aim to derive polarimetric properties for a large sample of CEMP stars and CH stars to fill this gap. Multiband polarimetric observations were conducted in the first run for a sample of twenty-nine objects that include twenty-two CEMP and CH stars and seven polarization standards. Estimates of polarization were obtained using standard procedures of polarization calculation. Five objects in our sample do not show any significant polarization over the different colours of BVRI. For the rest of the objects the derived percentage polarization estimates are ≤1%, and they are found to exhibit random behaviour with respect to the inverse of the effective wavelength of observations. Polarization also does not seem to have any correlation with the effective temperatures of the stars. Our polarimetric estimates indicate there are circumstellar envelopes around these stars that are spherically symmetric or envelopes with little or no dust. In the plane of differential polarization, defined as the difference between the maximum and the minimum polarizations within the BVRI-bands, versus their visual magnitude, the stars appear to be confined to a narrow band. The implication of this trend for understanding the nature of the circumstellar environment remains to be determined and requires detailed modelling.

Abstract Copyright:

Journal keyword(s): stars: carbon - stars: late-type - stars: variables: general - polarization

Simbad objects: 36

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Number of rows : 36

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 26 Pe* 00 05 22.2077761394 +08 47 16.096990670 9.80 9.29 8.25 7.49 7.03 C-H1.5 165 0
2 HD 1429 * 00 18 30.59355 +26 08 25.0616   7.86 7.71     A2 16 1
3 V* R Scl C* 01 26 58.0946233986 -32 32 35.437732667 17.26 9.59 5.72 3.69 2.30 C-N5+ 302 0
4 HD 236928 * 02 02 42.0926399205 +60 15 26.434612498   10.00 9.07     A4Ib 74 0
5 V* S Per s*r 02 22 51.7103845023 +58 35 11.454759954 13.22 10.55 7.90     M4.5-7Iae 359 0
6 HE 0310+0059 C* 03 12 56.9141550895 +01 11 09.602512215   12.902 11.761     C 7 0
7 HE 0518-2322 C* 05 20 35.5754769708 -23 19 14.264783076   14.070 12.788 12.258   C 4 0
8 HE 0519-2053 C* 05 21 54.4181662504 -20 50 35.315145616   14.88 13.70     C 4 0
9 * 119 Tau s*r 05 32 12.7525072 +18 35 39.243589 8.63 6.41 4.33 2.55 1.13 M2Iab-Ib 264 0
10 * 9 Gem s*b 06 16 58.7058947017 +23 44 27.286451876 6.31 6.70 6.25 5.78 5.38 B3Iab 225 0
11 HD 55496 Pe* 07 12 11.3777515932 -22 59 00.610613637   9.30 8.40     G(II)wp(Ba) 65 1
12 HD 65583 PM* 08 00 32.1297149403 +29 12 44.476641343 7.89 7.71 7.00 6.40 5.98 K0V_Fe-1.3 293 0
13 V* RT Pup C* 08 05 19.9851287871 -38 46 36.077146820 14.18 10.90 8.52     C-N5.5IIIa: 41 0
14 [TI98] 0915-0327 C* 09 18 08.2387986058 -03 39 56.548371240   15.19 12.90   11.335 C 9 0
15 HE 0916-0037 C* 09 18 47.6591177476 -00 50 34.767187830   14.04 12.80 12.294 11.882 C 4 0
16 HD 81192 Pe* 09 24 45.3354695684 +19 47 11.868330072 8.06 7.50 6.56     G8IIICH 114 0
17 V* X Vel C* 09 55 26.1119127674 -41 35 12.790399779   10.29 10.30 7.13 8.80 C-N3 63 0
18 HD 90508 ** 10 28 03.88212 +48 47 05.6554 7.09 7.03   5.98   F9-V 226 1
19 HE 1030-1518 C* 10 33 10.0615929432 -15 33 50.247499106   13.355 12.066 11.445 10.977 C 4 0
20 HD 92545 Pe* 10 40 57.7072314402 -12 11 44.223424837   9.07 9.149 8.25 9.047 F7IV 40 0
21 HD 94851 * 10 56 44.2558631737 -20 39 52.614977525   9.47 9.29     A5V 28 0
22 HE 1056-1855 C* 10 59 12.2560706964 -19 11 07.052786915   13.918 12.728 11.946 11.492 C 6 0
23 HD 100764 Pe* 11 35 42.7476806995 -14 35 36.663269333   9.81 8.79 8.08 7.65 C-H2.5 99 0
24 LEE 107 Pe* 11 55 39.7403353823 +12 34 48.106459679   13.43 10.83     C4:,3_CH 13 0
25 HD 107574 SB* 12 21 51.8580902959 -18 24 00.255862910   8.99 8.54     F3IV/V 47 0
26 GD 319 SB* 12 50 04.5262298 +55 06 01.800186   12.40 12.26 12.15   sdB+? 72 0
27 HD 111721 PM* 12 51 25.1948813622 -13 29 28.166794065   8.78 7.97     G6V 148 0
28 HD 112869 Pe* 12 59 22.6409641478 +37 49 03.687447775 12.83 10.72 8.91 7.79 6.92 C-H4- 84 0
29 HE 1345-2616 C* 13 48 02.0821965893 -26 31 12.413257302           C 2 0
30 HD 121447 Pe* 13 55 46.9649688947 -18 14 56.480134690 11.50 9.61 7.80     C2,1_CH4:_Ba4 117 0
31 HD 125079 Pe* 14 17 20.7181503569 -04 15 57.815586037   9.54 8.63     G2IIIBa1 33 0
32 HD 126681 PM* 14 27 24.9096361739 -18 24 40.457119166   9.939 9.535     G3V 169 0
33 HE 1428-1950 C* 14 30 59.3924642068 -20 03 41.910354235   13.276 12.040   10.770 C 10 0
34 CGCS 3504 C* 14 32 40.5723320757 -14 25 05.656206823         9.082 C 7 0
35 HD 160529 sg* 17 41 59.0257256544 -33 30 13.702939546 8.17 7.87 6.66 5.50 4.51 A2Ia 187 1
36 HD 164922 PM* 18 02 30.8624729311 +26 18 46.803383047   7.79   6.5   G9V 186 1

    Equat.    Gal    SGal    Ecl

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2021.01.27-12:16:55

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