J/AJ/105/258 UBVRI polarimetry in Car Nebula (Marraco+ 1993)
Intracluster dust polarization in the Carina nebula
MARRACO H.G., VEGA E.I., VRBA F.J.
<Astron. J. 105, 258 (1993)>
=1993AJ....105..258M 1993AJ....105..258M
Abstract:
We have obtained new UBVRI polarimetric observations of 25 stars and BV
polarimetric observations of 60 stars which are embedded in the Carina
Nebula. Using these data and photometric data from the literature we
have modeled and subtracted the foreground dust contribution in the
color excess E(B-V) and the visual polarization. The resulting
intracluster dust component is found to have a polarization efficiency
less than the maximum observed for the interstellar medium. The
intracluster dust is also characterized by a ratio of E(V-K)/E(B-V) to
lambda(max) higher than the canonical value for the interstellar
medium. This result is consistent with the anomalous extinction for
this region, reported by Tapia et al. [MNRAS, 232, 661 (1988a)], which
increases above normal values color excess ratios that are normalized
at wavelengths shorter than the V band.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tables.tex 141 810 TeX version of the tables
table1 62 61 BV polarimetric observations
table2 126 25 UBVRI polarimetric observations
table4 92 54 Observed, foreground, and intracluster color
excesses and visual polarizations
table5 126 18 UBVRI intracluster polarization
table6 86 18 UBVRI polarization results
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table1
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- Note [*] "*" if this is a "front-side" star
(22 stars determined to be cluster members
and which appear to be least affected by
reddening)
3- 8 A6 --- HD Henry Draper number (one star is identified as
"RT Car", instead)
10- 13 I4 --- LS []? Luminous Star (LS) number
(Stephenson & Sanduleak 1971).
15- 22 A8 --- Ident Identification (see note 1)
24- 27 F4.2 % P(V) Percentage of polarization in V
29- 31 F3.2 % e_P(V) rms uncertainty on P(V)
33- 37 F5.1 deg Theta(V) Equatorial position angle in V
39- 42 F4.1 deg e_Theta(V) rms uncertainty on Theta(V)
44- 47 F4.2 % P(B) Percentage of polarization in B
49- 51 F3.2 % e_P(B) rms uncertainty on P(B)
53- 57 F5.1 deg Theta(B) Equatorial position angle in B
59- 62 F4.1 deg e_Theta(B) rms uncertainty on Theta(B)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2 table5
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- Note [*] "*" if this is a "front-side" star
(22 stars determined to be cluster members
and and which appear to be least affected by
reddening)
3- 8 A6 --- HD []? Henry Draper number (one star is
identified as "RT Car", instead)
10- 13 A4 --- LS []? Luminous Star (LS) number
(Stephenson & Sanduleak 1971).
15- 22 A8 --- Ident Identification (see note 1)
24- 27 F4.2 % P374 []? Percentage of polarization in
lambda=0.374 um
29- 32 F4.2 % e_P374 []? rms uncertainty on P374
34- 38 F5.1 deg Theta374 []? Equatorial position angle in
lambda=0.374 um
40- 42 F3.1 deg e_Theta374 []? rms uncertainty on Theta374
45- 48 F4.2 % P443 Percentage of polarization in lambda=443 um
50- 53 F4.2 % e_P443 rms uncertainty on P443
55- 59 F5.1 deg Theta443 Equatorial position angle in lambda=443 um
61- 63 F3.1 deg e_Theta443 rms uncertainty on Theta443
66- 69 F4.2 % P563 Percentage of polarization in lambda=0.563 um
71- 74 F4.2 % e_P563 rms uncertainty on P563
76- 80 F5.1 deg Theta563 Equatorial position angle in lambda=0.563 um
82- 84 F3.1 deg e_Theta563 rms uncertainty on Theta563
87- 90 F4.2 % P670 Percentage of polarization in lambda=0.670 um
92- 95 F4.2 % e_P670 rms uncertainty on P670
97-101 F5.1 deg Theta670 Equatorial position angle in lambda=0.670 um
103-105 F3.1 deg e_Theta670 rms uncertainty on Theta670
108-111 F4.2 % P792 Percentage of polarization in lambda=0.792 um
113-116 F4.2 % e_P792 rms uncertainty on P792
118-122 F5.1 deg Theta792 Equatorial position angle in lambda=0.792 um
124-126 F3.1 deg e_Theta792 rms uncertainty on Theta792
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- HD Henry Draper number
(one star is identified as "RT Car", instead)
8- 11 I4 --- LS []? Luminous Star (LS) number
(Stephenson & Sanduleak 1971).
13- 20 A8 --- Ident Identification (see note 1)
22- 25 F4.2 mag E(B-V)O []? Observed B-V color excess
28- 30 F3.2 mag E(B-V)F Foreground B-V color excess
33- 35 F3.2 mag E(B-V)I []? Intracluster B-V color excess
38- 41 F4.2 % P(V)O Observed polarization in V
43- 45 F3.2 % e_P(V)O rms uncertainty on P(V)
48- 52 F5.1 deg Theta(V)O Observed equatorial position angle in V
54- 57 F4.1 deg e_Theta(V)O rms uncertainty on Theta(V)
60- 63 F4.2 % P(V)F Foreground polarization in V
66- 70 F5.1 deg Theta(V)F Foreground equatorial position angle in V
73- 76 F4.2 % P(V)I Intracluster polarization in V
78- 80 F3.2 % e_P(V)I rms uncertainty on P(V)
83- 87 F5.1 deg Theta(V)I Intracluster equatorial position angle in V
89- 92 F4.1 deg e_Theta(V)I rms uncertainty on Theta(V)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- HD Henry Draper number
(one star is identified as "RT Car", instead)
8- 11 A4 --- LS Luminous Star (LS) number
(Stephenson & Sanduleak 1971).
13- 20 A8 --- Ident Identification (see note 1)
22- 25 F4.2 --- <e_Theta>O Observed dispersion of position angle
normalized by the average of the position
angle errors
28- 31 F4.2 --- <e_Theta>I Intracluster dispersion of position angle
normalized by the average of the position
angle errors
32 A1 --- u<eTheta>I A colon, ':', flags two stars that have
computed intracluster P(max) < 0.5%, and,
hence, small intracluster polarizations in
relation to the external errors. The authors
have chosen not to extract results from
these stars.
35- 38 F4.3 um LambdaO Observed wavelength of maximum polarization
40- 43 F4.3 um e_LambdaO rms uncertainty on LambdaO
46- 49 F4.2 % PmaxO Observed polarization
51- 53 F3.2 % e_PmaxO rms uncertainty on PmaxO
56- 59 F4.2 % Sigma1O Observed unit weight error of
least-squares fit
61- 65 F5.3 um LambdaI Intracluster wavelength of maximum
polarization
67- 70 F4.3 um e_LambdaI rms uncertainty on LambdaI
73- 76 F4.2 % PmaxI Intracluster polarization
77 A1 --- u_PmaxI Uncertainty flag on PmaxI
78- 80 F3.2 % e_PmaxI []? rms uncertainty on PmaxI
83- 86 F4.2 % Sigma1I Intracluster unit weight error of
least-squares fit
--------------------------------------------------------------------------------
Note (1):
Identification from Feinstein, Marraco & Muzzio (1973), Feinstein, Marraco
& Forte (1976), Feinstein, Fitzgerald & Moffat (1980) and
Feinstein (1982): 14-, 15-, 16- and C- indicate respectively
Tr 14, Tr 15, Tr 16 and Collinder 228;
FO- from Forte & Orsatti (1981)
SRN- from van den Bergh & Herbst (1975)
References:
Feinstein, A. 1982, AJ, 87, 1012
Feinstein, A., Fitzgerald, M. P., & Moffat, A. F. J. 1980, AJ, 85, 708
Feinstein, A., Marraco, H. G., & Forte, J. C. 1976, A&AS, 24, 389
Feinstein, A., Marraco, H. G., & Muzzio, J. C. 1973, A&AS, 12, 331
Forte J.C. & Orsatti A.M. 1981, AJ, 86, 209
Stephenson C.B. & Sanduleak N. 1971, Publ. Warner and Swasey obs.,
Vol. 1 , No. 1
van den Bergh S. & Herbst W. 1975, AJ, 80, 208
--------------------------------------------------------------------------------
Origin: AAS CD-ROM series, Volume 1, 1993
(End) Patricia Bauer [CDS] 06-Jul-1994