2011AJ....142...11L


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.10CET11:13:30

2011AJ....142...11L - Astron. J., 142, 11 (2011/July-0)

UBVR polarimetry of evolved carbon stars near the galactic equator.

LOPEZ J.M. and HIRIART D.

Abstract (from CDS):

We present polarimetry and photometry in the UBVR bands of nine low Galactic latitude carbon stars (| b II| ≤ 15°) over a period of one year: V384 Per, ST Cam, S Aur, CL Mon, HV Cas, Y Tau, TT Cyg, U Cyg, and V1426 Cyg. We have corrected the observed values for the effects of extinction and polarization by the interstellar medium to obtain the intrinsic polarization and photometry of the stars. All the observed objects present polarization in at least two bands. There is a statistical correlation between the temporal mean polarization <p> at each filter band and the IR color K - [12] with the redder stars tending to be more polarized. A related trend is found between polarization and mass-loss rate in gas. The degree of polarization increases with the mass-loss rate at around. We found two stars–TT Cyg and ST Cam–that increase polarization with decreasing mass-loss rate below this value. Multiple observations of TT Cyg, U Cyg, and V1426 Cyg during the campaign show no correlation between polarization and luminosity in any of the UBVR bands. Therefore, the distribution of the scatterers shall vary with time in a very irregular way.

Abstract Copyright:

Journal keyword(s): circumstellar matter - polarization - stars: carbon - stars: variables: general

CDS comments: In paragraph 4.4 V1426 Per is a misprint for V1426 Cyg.

Simbad objects: 9

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Number of rows : 9

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 V* HV Cas C* 01 11 03.4682980461 +53 43 40.237002902     12.90     C4,3e 74 0
2 LEE 259 C* 03 26 29.5050382299 +47 31 48.463099623           N 165 0
3 V* ST Cam C* 04 51 13.3478339517 +68 10 07.646494913   9.77 9.20     C-N5 135 0
4 V* S Aur C* 05 27 07.4588448362 +34 08 58.844765355   13.48 8.20     C-N5+ 116 0
5 V* Y Tau C* 05 45 39.4116657307 +20 41 42.150008983 15.71 9.90 6.90 4.69 3.19 C-N5- 210 1
6 V* CL Mon C* 06 55 36.6908412468 +06 22 43.192362346   12.69 11.00     C-J:6 86 0
7 V* TT Cyg C* 19 40 57.0159854799 +32 37 05.755486755   10.43 10.20     C-N5- 185 0
8 V* U Cyg C* 20 19 36.5944622319 +47 53 39.085332215   11.85 5.90     C9,2e 222 0
9 LEE 228 C* 21 34 07.4799447797 +39 04 15.894727898   16.72 11.90     C7,2e 105 0

    Equat.    Gal    SGal    Ecl

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2019.12.10-11:13:30

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